82_FR_20533 82 FR 20450 - Airworthiness Directives; The Boeing Company Airplanes

82 FR 20450 - Airworthiness Directives; The Boeing Company Airplanes

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 82, Issue 83 (May 2, 2017)

Page Range20450-20453
FR Document2017-08831

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-200, -200C, -300, -400, and -500 series airplanes. This proposed AD was prompted by reports of skin doublers that disbonded from their skin panels. This proposed AD would require repetitive inspections of fuselage skin panels, and applicable on-condition actions. We are proposing this AD to address the unsafe condition on these products.

Federal Register, Volume 82 Issue 83 (Tuesday, May 2, 2017)
[Federal Register Volume 82, Number 83 (Tuesday, May 2, 2017)]
[Proposed Rules]
[Pages 20450-20453]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2017-08831]


========================================================================
Proposed Rules
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of 
the proposed issuance of rules and regulations. The purpose of these 
notices is to give interested persons an opportunity to participate in 
the rule making prior to the adoption of the final rules.

========================================================================


Federal Register / Vol. 82, No. 83 / Tuesday, May 2, 2017 / Proposed 
Rules

[[Page 20450]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0332; Directorate Identifier 2016-NM-164-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain The Boeing Company Model 737-200, -200C, -300, -400, and -500 
series airplanes. This proposed AD was prompted by reports of skin 
doublers that disbonded from their skin panels. This proposed AD would 
require repetitive inspections of fuselage skin panels, and applicable 
on-condition actions. We are proposing this AD to address the unsafe 
condition on these products.

DATES: We must receive comments on this proposed AD by June 16, 2017.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this NPRM, contact Boeing 
Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 
2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600; 
telephone 562-797-1717; Internet https://www.myboeingfleet.com. You may 
view this referenced service information at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue SW., Renton, WA. For information on the 
availability of this material at the FAA, call 425-227-1221. It is also 
available on the Internet at http://www.regulations.gov by searching 
for and locating Docket No. FAA-2017-0332.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-
0332; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this proposed AD, the regulatory evaluation, any comments 
received, and other information. The street address for the Docket 
Office (phone: 800-647-5527) is in the ADDRESSES section. Comments will 
be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Wade Sullivan, Aerospace Engineer, 
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office 
(ACO), 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917-
6430; fax: 425-917-6590; email: wade.sullivan@faa.gov.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2017-0332; 
Directorate Identifier 2016-NM-164-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD because of those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    Fatigue damage can occur locally, in small areas or structural 
design details, or globally, in widespread areas. Multiple-site damage 
is widespread damage that occurs in a large structural element such as 
a single rivet line of a lap splice joining two large skin panels. 
Widespread damage can also occur in multiple elements such as adjacent 
frames or stringers. Multiple-site damage and multiple-element damage 
cracks are typically too small initially to be reliably detected with 
normal inspection methods. Without intervention, these cracks will 
grow, and eventually compromise the structural integrity of the 
airplane. This condition is known as widespread fatigue damage. It is 
associated with general degradation of large areas of structure with 
similar structural details and stress levels. As an airplane ages, 
widespread fatigue damage (WFD) will likely occur, and will certainly 
occur if the airplane is operated long enough without any intervention.
    The FAA's WFD final rule (75 FR 69746, November 15, 2010) became 
effective on January 14, 2011. The WFD rule requires certain actions to 
prevent structural failure due to WFD throughout the operational life 
of certain existing transport category airplanes and all of these 
airplanes that will be certificated in the future. For existing and 
future airplanes subject to the WFD rule, the rule requires that DAHs 
establish a limit of validity (LOV) of the engineering data that 
support the structural maintenance program. Operators affected by the 
WFD rule may not fly an airplane beyond its LOV, unless an extended LOV 
is approved.
    The WFD rule (75 FR 69746, November 15, 2010) does not require 
identifying and developing maintenance actions if the DAHs can show 
that such actions are not necessary to prevent WFD before the airplane 
reaches the LOV. Many LOVs, however, do depend on accomplishment of 
future maintenance actions. As stated in the WFD rule, any maintenance 
actions necessary to reach the LOV will be mandated by airworthiness 
directives through separate rulemaking actions.
    In the context of WFD, this action is necessary to enable DAHs to 
propose

[[Page 20451]]

LOVs that allow operators the longest operational lives for their 
airplanes, and still ensure that WFD will not occur. This approach 
allows for an implementation strategy that provides flexibility to DAHs 
in determining the timing of service information development (with FAA 
approval), while providing operators with certainty regarding the LOV 
applicable to their airplanes.
    We have received reports of skin doublers that disbonded from their 
skin panels on certain Model 737 series airplanes. Bonded skin doublers 
are part of the back-up structure for the skin panels and are installed 
from body station (BS) 259.50 through BS 1016 on both sides of the 
airplane. The airplane manufacturer has attributed the root cause of 
disbonded skin doublers to improper processing during the phosphoric 
acid anodization phase of skin panel manufacturing. Disbonding of the 
skin panel reduces the skin panel's capability to resist cracks in the 
countersunk holes of fastened joints and can lead to fuselage skin 
cracking and multi-site damage, predominantly in the lap splices and 
butt joints. Fuselage skin cracking resulting from disbonded skin 
panels, if not detected and corrected, could result in rapid 
decompression and loss of structural integrity of the airplane.

Related Service Information Under 1 CFR Part 51

    We reviewed Boeing Alert Service Bulletin 737-53A1349, dated August 
23, 2016. The service information describes procedures for repetitive 
inspections of fuselage skin panels for cracking, corrosion, and 
existing disbond repairs; and applicable on-condition actions. This 
service information is reasonably available because the interested 
parties have access to it through their normal course of business or by 
the means identified in the ADDRESSES section.

FAA's Determination

    We are proposing this AD because we evaluated all the relevant 
information and determined that the unsafe condition described 
previously is likely to exist or develop in other products of the same 
type design.

Proposed AD Requirements

    This proposed AD would require accomplishment of the actions 
identified as ``RC'' (required for compliance) in the Accomplishment 
Instructions of Boeing Alert Service Bulletin 737-53A1349, dated August 
23, 2016, described previously, except for differences between this 
proposed AD and the service information that are identified in the 
regulatory text of this proposed AD.
    For information on the procedures and compliance times, see this 
service information at http://www.regulations.gov by searching for and 
locating Docket No. FAA-2017-0332.

Related Rulemaking

    AD 2003-14-06, Amendment 39-13225 (68 FR 40759, July 9, 2003; 
corrected July 21, 2003 (68 FR 42956)) (``AD 2003-14-06''), applies to 
certain Model 737-200, -200C, -300, -400, and -500 series airplanes. AD 
2003-14-06 requires repetitive inspections for cracking of certain lap 
splices, and corrective action if necessary. Accomplishment of initial 
inspections specified in this proposed AD would terminate all 
requirements of AD 2003-14-06.

Explanation of Certain Compliance Times

    The compliance time to replace skin panels, which is one of the 
actions identified as ``RC'' for certain conditions to address WFD in 
this NPRM, was established to ensure that discrepant structure is 
replaced before WFD develops in airplanes. Standard inspection 
techniques cannot be relied on to detect WFD before it becomes a hazard 
to flight. We will not grant any extensions of the compliance time to 
complete any AD-mandated service bulletin related to WFD without 
extensive new data that would substantiate and clearly warrant such an 
extension.
    Table 9 of paragraph 1.E., ``Compliance,'' of Boeing Alert Service 
Bulletin 737-53A1349, dated August 23, 2016, does not provide a grace 
period for airplanes that have exceeded a certain compliance time. 
Paragraph (h)(3) of this proposed AD adds a grace period of 4,500 
flight cycles. We have coordinated this grace period with Boeing.

Costs of Compliance

    We estimate that this proposed AD affects 169 airplanes of U.S. 
registry. We estimate the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
              Action                    Labor cost        Parts cost      Cost per product        operators
----------------------------------------------------------------------------------------------------------------
External general visual and        180 work-hours x                 $0  $15,300 per          $2,585,700 per
 detailed inspections.              $85 per hour =                       inspection cycle.    inspection cycle.
                                    $15,300 per
                                    inspection cycle.
External high frequency bond test  450 work hours x                  0  $38,250 inspection   $6,464,250 per
 inspection.                        $85 per hour =                       cycle.               inspection cycle.
                                    $38,250 per
                                    inspection cycle.
Ultrasonic disbond inspection and  630 work-hours x                  0  $53,550 per          $9,049,950 per
 internal detailed skin             $85 per hour =                       inspection cycle.    inspection cycle.
 inspection.                        $53,550 per
                                    inspection cycle.
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary on-condition 
actions that would be required based on the results of the proposed 
inspections. We have no way of determining the number of aircraft that 
might need these on-condition actions:

                                        On-Condition Costs per Skin Panel
----------------------------------------------------------------------------------------------------------------
              Action                        Labor cost                Parts cost            Cost per product
----------------------------------------------------------------------------------------------------------------
On-condition inspections..........  Up to 25 work-hours x $85   $0...................  Up to $2,125.
                                     per hour = $2,125.
Repairs...........................  Up to 68 work-hours x $85   Up to $100...........  Up to $5,880.
                                     per hour = $5,780.

[[Page 20452]]

 
Skin panel replacement............  304 work-hours x $85 per    $95,000..............  $120,840.
                                     hour = $25,840.
----------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII: Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the national Government and the States, or on the distribution 
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify this proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

The Boeing Company: Docket No. FAA-2017-0332; Directorate Identifier 
2016-NM-164-AD.

(a) Comments Due Date

    We must receive comments by June 16, 2017.

(b) Affected ADs

    This AD affects AD 2003-14-06, Amendment 39-13225 (68 FR 40759, 
July 9, 2003; corrected July 21, 2003 (68 FR 42956)) (``AD 2003-14-
06'').

(c) Applicability

    This AD applies to The Boeing Company Model 737-200, -200C, -
300, -400, and -500 series airplanes, certificated in any category, 
as identified in Boeing Alert Service Bulletin 737-53A1349, dated 
August 23, 2016.

(d) Subject

    Air Transport Association (ATA) of America Code 53, Fuselage.

(e) Unsafe Condition

    This AD was prompted by reports of skin doublers that disbonded 
from their skin panels. We are issuing this AD to detect and correct 
disbonded skin panels, which could result in fuselage skin cracking, 
rapid decompression, and loss of structural integrity of the 
airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Actions Required for Compliance

    Except as required by paragraph (h) of this AD: Do all 
applicable actions identified as required for compliance (``RC'') 
in, and in accordance with, the Accomplishment Instructions of 
Boeing Alert Service Bulletin 737-53A1349, dated August 23, 2016. Do 
the actions at the applicable times specified in paragraph 1.E., 
``Compliance,'' of Boeing Alert Service Bulletin 737-53A1349, dated 
August 23, 2016.

(h) Exceptions to Service Information Specifications

    (1) Where Boeing Alert Service Bulletin 737-53A1349, dated 
August 23, 2016, uses the phrase ``after the original issue of this 
service bulletin,'' for purposes of determining compliance with the 
requirements of this AD, the phrase ``after the effective date of 
this AD'' must be used.
    (2) Where Boeing Alert Service Bulletin 737-53A1349, dated 
August 23, 2016, specifies contacting Boeing for instructions, and 
specifies that action as ``RC'' (Required for Compliance): This AD 
requires using a method approved in accordance with the procedures 
specified in paragraph (k) of this AD.
    (3) For replaced skin panels identified in table 9 of paragraph 
1.E., ``Compliance,'' of Boeing Alert Service Bulletin 737-53A1349, 
dated August 23, 2016, on which the one-time internal inspection 
specified in Service Bulletin 737-53-1179, Revision 2, dated October 
25, 2001, has not been done: The compliance time for accomplishment 
of the actions specified in Part 8 of the Accomplishment 
Instructions of Boeing Alert Service Bulletin 737-53A1349, dated 
August 23, 2016, is at the latest of the times specified in 
paragraphs (h)(3)(i), (h)(3)(ii), and (h)(3)(iii) of this AD.
    (i) Within 50,000 flight cycles after the skin panel 
replacement.
    (ii) Within 20,000 flight cycles after July 14, 2003 (the 
effective date of AD 2003-14-16).
    (iii) Within 4,500 flight cycles after the effective date of 
this AD.

(i) Terminating Action for This AD

    Accomplishment of any skin panel replacement, as specified in 
the Accomplishment Instructions of Boeing Alert Service Bulletin 
737-53A1349, dated August 23, 2016, except as required by paragraph 
(h)(2) of this AD, terminates the repetitive inspections required by 
paragraph (g) of this AD at the replaced skin panel only.

(j) Terminating Action for AD 2003-14-06

    Accomplishment of the initial inspections required by paragraph 
(g) of this AD terminates all requirements of AD 2003-14-06.

(k) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Los Angeles Aircraft Certification Office, FAA, 
has the authority to approve AMOCs for this AD, if requested using 
the procedures found in 14 CFR 39.19. In accordance with 14 CFR 
39.19, send your request to your principal inspector or local Flight 
Standards District Office, as appropriate. If sending information 
directly to the manager of the ACO, send it to the attention of the 
person identified in paragraph (l)(1) of this AD. Information may

[[Page 20453]]

be emailed to: 9-ANM-LAACO-AMOC-Requests@faa.gov.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.
    (3) An AMOC that provides an acceptable level of safety may be 
used for any repair, modification, or alteration required by this AD 
if it is approved by the Boeing Commercial Airplanes Organization 
Designation Authorization (ODA) that has been authorized by the 
Manager, Seattle ACO, to make those findings. To be approved, the 
repair method, modification deviation, or alteration deviation must 
meet the certification basis of the airplane, and the approval must 
specifically refer to this AD.
    (4) Except as required by paragraph (h)(2) of this AD: For 
service information that contains steps that are labeled as Required 
for Compliance (RC), the provisions of paragraphs (k)(4)(i) and 
(k)(4)(ii) of this AD apply.
    (i) The steps labeled as RC, including substeps under an RC step 
and any figures identified in an RC step, must be done to comply 
with the AD. If a step or substep is labeled ``RC Exempt,'' then the 
RC requirement is removed from that step or substep. An AMOC is 
required for any deviations to RC steps, including substeps and 
identified figures.
    (ii) Steps not labeled as RC may be deviated from using accepted 
methods in accordance with the operator's maintenance or inspection 
program without obtaining approval of an AMOC, provided the RC 
steps, including substeps and identified figures, can still be done 
as specified, and the airplane can be put back in an airworthy 
condition.

(l) Related Information

    (1) For more information about this AD, contact Wade Sullivan, 
Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft 
Certification Office (ACO), 1601 Lind Avenue SW., Renton, WA 98057-
3356; phone: 425-917-6430; fax: 425-917-6590; email: 
wade.sullivan@faa.gov.
    (2) For information about AMOCs, contact Jennifer Tsakoumakis, 
Airframe Branch, ANM-120L, FAA, Los Angeles Aircraft Certification 
Office (ACO), 3960 Paramount Boulevard, Lakewood, CA 90712-4137; 
phone: 562-627-5264; fax: 562-627-5210; email: 
jennifer.tsakoumakis@faa.gov.
    (3) For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Contractual & Data Services 
(C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-
5600; telephone 562-797-1717; Internet https://www.myboeingfleet.com. You may view this referenced service 
information at the FAA, Transport Airplane Directorate, 1601 Lind 
Avenue SW., Renton, WA. For information on the availability of this 
material at the FAA, call 425-227-1221.

    Issued in Renton, Washington, on April 24, 2017.
Paul Bernado,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2017-08831 Filed 5-1-17; 8:45 am]
 BILLING CODE 4910-13-P



                                                    20450

                                                    Proposed Rules                                                                                                Federal Register
                                                                                                                                                                  Vol. 82, No. 83

                                                                                                                                                                  Tuesday, May 2, 2017



                                                    This section of the FEDERAL REGISTER                    Blvd., MC 110–SK57, Seal Beach, CA                    will also post a report summarizing each
                                                    contains notices to the public of the proposed          90740–5600; telephone 562–797–1717;                   substantive verbal contact we receive
                                                    issuance of rules and regulations. The                  Internet https://                                     about this proposed AD.
                                                    purpose of these notices is to give interested          www.myboeingfleet.com. You may view
                                                    persons an opportunity to participate in the                                                                  Discussion
                                                                                                            this referenced service information at
                                                    rule making prior to the adoption of the final                                                                   Fatigue damage can occur locally, in
                                                    rules.
                                                                                                            the FAA, Transport Airplane
                                                                                                            Directorate, 1601 Lind Avenue SW.,                    small areas or structural design details,
                                                                                                            Renton, WA. For information on the                    or globally, in widespread areas.
                                                                                                            availability of this material at the FAA,             Multiple-site damage is widespread
                                                    DEPARTMENT OF TRANSPORTATION
                                                                                                            call 425–227–1221. It is also available               damage that occurs in a large structural
                                                    Federal Aviation Administration                         on the Internet at http://                            element such as a single rivet line of a
                                                                                                            www.regulations.gov by searching for                  lap splice joining two large skin panels.
                                                    14 CFR Part 39                                          and locating Docket No. FAA–2017–                     Widespread damage can also occur in
                                                                                                            0332.                                                 multiple elements such as adjacent
                                                    [Docket No. FAA–2017–0332; Directorate                                                                        frames or stringers. Multiple-site
                                                    Identifier 2016–NM–164–AD]                              Examining the AD Docket                               damage and multiple-element damage
                                                    RIN 2120–AA64                                              You may examine the AD docket on                   cracks are typically too small initially to
                                                                                                            the Internet at http://                               be reliably detected with normal
                                                    Airworthiness Directives; The Boeing                    www.regulations.gov by searching for                  inspection methods. Without
                                                    Company Airplanes                                       and locating Docket No. FAA–2017–                     intervention, these cracks will grow,
                                                                                                            0332; or in person at the Docket                      and eventually compromise the
                                                    AGENCY: Federal Aviation                                Management Facility between 9 a.m.                    structural integrity of the airplane. This
                                                    Administration (FAA), DOT.                              and 5 p.m., Monday through Friday,                    condition is known as widespread
                                                    ACTION: Notice of proposed rulemaking                   except Federal holidays. The AD docket                fatigue damage. It is associated with
                                                    (NPRM).                                                 contains this proposed AD, the                        general degradation of large areas of
                                                                                                            regulatory evaluation, any comments                   structure with similar structural details
                                                    SUMMARY:   We propose to adopt a new                                                                          and stress levels. As an airplane ages,
                                                                                                            received, and other information. The
                                                    airworthiness directive (AD) for certain                                                                      widespread fatigue damage (WFD) will
                                                                                                            street address for the Docket Office
                                                    The Boeing Company Model 737–200,                                                                             likely occur, and will certainly occur if
                                                                                                            (phone: 800–647–5527) is in the
                                                    –200C, –300, –400, and –500 series                                                                            the airplane is operated long enough
                                                                                                            ADDRESSES section. Comments will be
                                                    airplanes. This proposed AD was                                                                               without any intervention.
                                                                                                            available in the AD docket shortly after
                                                    prompted by reports of skin doublers                                                                             The FAA’s WFD final rule (75 FR
                                                                                                            receipt.
                                                    that disbonded from their skin panels.                                                                        69746, November 15, 2010) became
                                                                                                            FOR FURTHER INFORMATION CONTACT:
                                                    This proposed AD would require                                                                                effective on January 14, 2011. The WFD
                                                    repetitive inspections of fuselage skin                 Wade Sullivan, Aerospace Engineer,                    rule requires certain actions to prevent
                                                    panels, and applicable on-condition                     Airframe Branch, ANM–120S, FAA,                       structural failure due to WFD
                                                    actions. We are proposing this AD to                    Seattle Aircraft Certification Office                 throughout the operational life of
                                                    address the unsafe condition on these                   (ACO), 1601 Lind Avenue SW., Renton,                  certain existing transport category
                                                    products.                                               WA 98057–3356; phone: 425–917–6430;                   airplanes and all of these airplanes that
                                                                                                            fax: 425–917–6590; email:                             will be certificated in the future. For
                                                    DATES:  We must receive comments on                     wade.sullivan@faa.gov.
                                                    this proposed AD by June 16, 2017.                                                                            existing and future airplanes subject to
                                                                                                            SUPPLEMENTARY INFORMATION:                            the WFD rule, the rule requires that
                                                    ADDRESSES: You may send comments,                                                                             DAHs establish a limit of validity (LOV)
                                                    using the procedures found in 14 CFR                    Comments Invited
                                                                                                                                                                  of the engineering data that support the
                                                    11.43 and 11.45, by any of the following                  We invite you to send any written                   structural maintenance program.
                                                    methods:                                                relevant data, views, or arguments about              Operators affected by the WFD rule may
                                                      • Federal eRulemaking Portal: Go to                   this proposal. Send your comments to                  not fly an airplane beyond its LOV,
                                                    http://www.regulations.gov. Follow the                  an address listed under the ADDRESSES                 unless an extended LOV is approved.
                                                    instructions for submitting comments.                   section. Include ‘‘Docket No. FAA–                       The WFD rule (75 FR 69746,
                                                      • Fax: 202–493–2251.                                  2017–0332; Directorate Identifier 2016–               November 15, 2010) does not require
                                                      • Mail: U.S. Department of                            NM–164–AD’’ at the beginning of your                  identifying and developing maintenance
                                                    Transportation, Docket Operations, M–                   comments. We specifically invite                      actions if the DAHs can show that such
                                                    30, West Building Ground Floor, Room                    comments on the overall regulatory,                   actions are not necessary to prevent
                                                    W12–140, 1200 New Jersey Avenue SE.,                    economic, environmental, and energy                   WFD before the airplane reaches the
                                                    Washington, DC 20590.                                   aspects of this proposed AD. We will                  LOV. Many LOVs, however, do depend
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                      • Hand Delivery: Deliver to Mail                      consider all comments received by the                 on accomplishment of future
                                                    address above between 9 a.m. and 5                      closing date and may amend this                       maintenance actions. As stated in the
                                                    p.m., Monday through Friday, except                     proposed AD because of those                          WFD rule, any maintenance actions
                                                    Federal holidays.                                       comments.                                             necessary to reach the LOV will be
                                                      For service information identified in                   We will post all comments we                        mandated by airworthiness directives
                                                    this NPRM, contact Boeing Commercial                    receive, without change, to http://                   through separate rulemaking actions.
                                                    Airplanes, Attention: Contractual & Data                www.regulations.gov, including any                       In the context of WFD, this action is
                                                    Services (C&DS), 2600 Westminster                       personal information you provide. We                  necessary to enable DAHs to propose


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                                                                                       Federal Register / Vol. 82, No. 83 / Tuesday, May 2, 2017 / Proposed Rules                                                                    20451

                                                    LOVs that allow operators the longest                                    fuselage skin panels for cracking,                    requires repetitive inspections for
                                                    operational lives for their airplanes, and                               corrosion, and existing disbond repairs;              cracking of certain lap splices, and
                                                    still ensure that WFD will not occur.                                    and applicable on-condition actions.                  corrective action if necessary.
                                                    This approach allows for an                                              This service information is reasonably                Accomplishment of initial inspections
                                                    implementation strategy that provides                                    available because the interested parties              specified in this proposed AD would
                                                    flexibility to DAHs in determining the                                   have access to it through their normal                terminate all requirements of AD 2003–
                                                    timing of service information                                            course of business or by the means                    14–06.
                                                    development (with FAA approval),                                         identified in the ADDRESSES section.
                                                                                                                                                                                   Explanation of Certain Compliance
                                                    while providing operators with certainty                                 FAA’s Determination                                   Times
                                                    regarding the LOV applicable to their
                                                    airplanes.                                                                 We are proposing this AD because we                    The compliance time to replace skin
                                                       We have received reports of skin                                      evaluated all the relevant information                panels, which is one of the actions
                                                    doublers that disbonded from their skin                                  and determined that the unsafe                        identified as ‘‘RC’’ for certain conditions
                                                    panels on certain Model 737 series                                       condition described previously is likely              to address WFD in this NPRM, was
                                                    airplanes. Bonded skin doublers are part                                 to exist or develop in other products of              established to ensure that discrepant
                                                    of the back-up structure for the skin                                    the same type design.                                 structure is replaced before WFD
                                                    panels and are installed from body                                       Proposed AD Requirements                              develops in airplanes. Standard
                                                    station (BS) 259.50 through BS 1016 on                                                                                         inspection techniques cannot be relied
                                                                                                                               This proposed AD would require
                                                    both sides of the airplane. The airplane                                                                                       on to detect WFD before it becomes a
                                                                                                                             accomplishment of the actions
                                                    manufacturer has attributed the root                                     identified as ‘‘RC’’ (required for                    hazard to flight. We will not grant any
                                                    cause of disbonded skin doublers to                                      compliance) in the Accomplishment                     extensions of the compliance time to
                                                    improper processing during the                                           Instructions of Boeing Alert Service                  complete any AD-mandated service
                                                    phosphoric acid anodization phase of                                     Bulletin 737–53A1349, dated August 23,                bulletin related to WFD without
                                                    skin panel manufacturing. Disbonding                                     2016, described previously, except for                extensive new data that would
                                                    of the skin panel reduces the skin                                       differences between this proposed AD                  substantiate and clearly warrant such an
                                                    panel’s capability to resist cracks in the                               and the service information that are                  extension.
                                                    countersunk holes of fastened joints and                                 identified in the regulatory text of this                Table 9 of paragraph 1.E.,
                                                    can lead to fuselage skin cracking and                                   proposed AD.                                          ‘‘Compliance,’’ of Boeing Alert Service
                                                    multi-site damage, predominantly in the                                    For information on the procedures                   Bulletin 737–53A1349, dated August 23,
                                                    lap splices and butt joints. Fuselage skin                               and compliance times, see this service                2016, does not provide a grace period
                                                    cracking resulting from disbonded skin                                   information at http://                                for airplanes that have exceeded a
                                                    panels, if not detected and corrected,                                   www.regulations.gov by searching for                  certain compliance time. Paragraph
                                                    could result in rapid decompression and                                  and locating Docket No. FAA–2017–                     (h)(3) of this proposed AD adds a grace
                                                    loss of structural integrity of the                                      0332.                                                 period of 4,500 flight cycles. We have
                                                    airplane.                                                                                                                      coordinated this grace period with
                                                                                                                             Related Rulemaking                                    Boeing.
                                                    Related Service Information Under 1
                                                                                                                                AD 2003–14–06, Amendment 39–
                                                    CFR Part 51                                                                                                                    Costs of Compliance
                                                                                                                             13225 (68 FR 40759, July 9, 2003;
                                                      We reviewed Boeing Alert Service                                       corrected July 21, 2003 (68 FR 42956))                   We estimate that this proposed AD
                                                    Bulletin 737–53A1349, dated August 23,                                   (‘‘AD 2003–14–06’’), applies to certain               affects 169 airplanes of U.S. registry. We
                                                    2016. The service information describes                                  Model 737–200, –200C, –300, –400, and                 estimate the following costs to comply
                                                    procedures for repetitive inspections of                                 –500 series airplanes. AD 2003–14–06                  with this proposed AD:

                                                                                                                                          ESTIMATED COSTS
                                                                      Action                                       Labor cost                    Parts cost               Cost per product                     Cost on U.S. operators

                                                    External general visual and                      180 work-hours × $85 per                                 $0   $15,300 per inspection cycle           $2,585,700 per inspection
                                                      detailed inspections.                            hour = $15,300 per inspec-                                                                           cycle.
                                                                                                       tion cycle.
                                                    External high frequency bond                     450 work hours × $85 per                                  0   $38,250 inspection cycle .......       $6,464,250 per inspection
                                                      test inspection.                                 hour = $38,250 per inspec-                                                                           cycle.
                                                                                                       tion cycle.
                                                    Ultrasonic disbond inspection                    630 work-hours × $85 per                                  0   $53,550 per inspection cycle           $9,049,950 per inspection
                                                      and internal detailed skin                       hour = $53,550 per inspec-                                                                           cycle.
                                                      inspection.                                      tion cycle.



                                                      We estimate the following costs to do                                  of the proposed inspections. We have no               aircraft that might need these on-
                                                    any necessary on-condition actions that                                  way of determining the number of                      condition actions:
                                                    would be required based on the results
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                                                                                             ON-CONDITION COSTS PER SKIN PANEL
                                                                                                                                                                                                                                 Cost per
                                                                                    Action                                                          Labor cost                                   Parts cost                      product

                                                    On-condition inspections ......................................              Up to 25 work-hours × $85 per hour = $2,125 ..        $0 .................................   Up to $2,125.
                                                    Repairs ..................................................................   Up to 68 work-hours × $85 per hour = $5,780 ..        Up to $100 ...................         Up to $5,880.




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                                                    20452                         Federal Register / Vol. 82, No. 83 / Tuesday, May 2, 2017 / Proposed Rules

                                                                                                        ON-CONDITION COSTS PER SKIN PANEL—Continued
                                                                                                                                                                                                                 Cost per
                                                                               Action                                                    Labor cost                                 Parts cost                   product

                                                    Skin panel replacement ........................................   304 work-hours × $85 per hour = $25,840 ........     $95,000 ........................   $120,840.



                                                    Authority for This Rulemaking                                 the FAA proposes to amend 14 CFR part                 (h) Exceptions to Service Information
                                                                                                                  39 as follows:                                        Specifications
                                                       Title 49 of the United States Code
                                                                                                                                                                           (1) Where Boeing Alert Service Bulletin
                                                    specifies the FAA’s authority to issue                        PART 39—AIRWORTHINESS                                 737–53A1349, dated August 23, 2016, uses
                                                    rules on aviation safety. Subtitle I,                         DIRECTIVES                                            the phrase ‘‘after the original issue of this
                                                    section 106, describes the authority of                                                                             service bulletin,’’ for purposes of determining
                                                    the FAA Administrator. Subtitle VII:                                                                                compliance with the requirements of this AD,
                                                                                                                  ■ 1. The authority citation for part 39
                                                    Aviation Programs, describes in more                                                                                the phrase ‘‘after the effective date of this
                                                                                                                  continues to read as follows:                         AD’’ must be used.
                                                    detail the scope of the Agency’s
                                                    authority.                                                        Authority: 49 U.S.C. 106(g), 40113, 44701.           (2) Where Boeing Alert Service Bulletin
                                                                                                                                                                        737–53A1349, dated August 23, 2016,
                                                       We are issuing this rulemaking under
                                                                                                                  § 39.13   [Amended]                                   specifies contacting Boeing for instructions,
                                                    the authority described in Subtitle VII,                                                                            and specifies that action as ‘‘RC’’ (Required
                                                    Part A, Subpart III, Section 44701:                           ■ 2. The FAA amends § 39.13 by adding                 for Compliance): This AD requires using a
                                                    ‘‘General requirements.’’ Under that                          the following new airworthiness                       method approved in accordance with the
                                                    section, Congress charges the FAA with                        directive (AD):                                       procedures specified in paragraph (k) of this
                                                    promoting safe flight of civil aircraft in                                                                          AD.
                                                                                                                  The Boeing Company: Docket No. FAA–
                                                    air commerce by prescribing regulations                                                                                (3) For replaced skin panels identified in
                                                                                                                      2017–0332; Directorate Identifier 2016–           table 9 of paragraph 1.E., ‘‘Compliance,’’ of
                                                    for practices, methods, and procedures                            NM–164–AD.                                        Boeing Alert Service Bulletin 737–53A1349,
                                                    the Administrator finds necessary for                                                                               dated August 23, 2016, on which the one-
                                                                                                                  (a) Comments Due Date
                                                    safety in air commerce. This regulation                                                                             time internal inspection specified in Service
                                                    is within the scope of that authority                           We must receive comments by June 16,                Bulletin 737–53–1179, Revision 2, dated
                                                    because it addresses an unsafe condition                      2017.                                                 October 25, 2001, has not been done: The
                                                    that is likely to exist or develop on                         (b) Affected ADs                                      compliance time for accomplishment of the
                                                    products identified in this rulemaking                                                                              actions specified in Part 8 of the
                                                                                                                     This AD affects AD 2003–14–06,                     Accomplishment Instructions of Boeing Alert
                                                    action.                                                       Amendment 39–13225 (68 FR 40759, July 9,              Service Bulletin 737–53A1349, dated August
                                                    Regulatory Findings                                           2003; corrected July 21, 2003 (68 FR 42956))          23, 2016, is at the latest of the times specified
                                                                                                                  (‘‘AD 2003–14–06’’).                                  in paragraphs (h)(3)(i), (h)(3)(ii), and
                                                      We determined that this proposed AD                                                                               (h)(3)(iii) of this AD.
                                                    would not have federalism implications                        (c) Applicability
                                                                                                                                                                           (i) Within 50,000 flight cycles after the skin
                                                    under Executive Order 13132. This                               This AD applies to The Boeing Company               panel replacement.
                                                    proposed AD would not have a                                  Model 737–200, –200C, –300, –400, and –500               (ii) Within 20,000 flight cycles after July
                                                    substantial direct effect on the States, on                   series airplanes, certificated in any category,       14, 2003 (the effective date of AD 2003–14–
                                                    the relationship between the national                         as identified in Boeing Alert Service Bulletin        16).
                                                    Government and the States, or on the                          737–53A1349, dated August 23, 2016.                      (iii) Within 4,500 flight cycles after the
                                                                                                                                                                        effective date of this AD.
                                                    distribution of power and                                     (d) Subject
                                                    responsibilities among the various                             Air Transport Association (ATA) of                   (i) Terminating Action for This AD
                                                    levels of government.                                         America Code 53, Fuselage.                               Accomplishment of any skin panel
                                                      For the reasons discussed above, I                                                                                replacement, as specified in the
                                                    certify this proposed regulation:                             (e) Unsafe Condition                                  Accomplishment Instructions of Boeing Alert
                                                      (1) Is not a ‘‘significant regulatory                         This AD was prompted by reports of skin             Service Bulletin 737–53A1349, dated August
                                                    action’’ under Executive Order 12866,                         doublers that disbonded from their skin               23, 2016, except as required by paragraph
                                                                                                                  panels. We are issuing this AD to detect and          (h)(2) of this AD, terminates the repetitive
                                                      (2) Is not a ‘‘significant rule’’ under                                                                           inspections required by paragraph (g) of this
                                                    the DOT Regulatory Policies and                               correct disbonded skin panels, which could
                                                                                                                  result in fuselage skin cracking, rapid               AD at the replaced skin panel only.
                                                    Procedures (44 FR 11034, February 26,
                                                                                                                  decompression, and loss of structural                 (j) Terminating Action for AD 2003–14–06
                                                    1979),                                                        integrity of the airplane.
                                                      (3) Will not affect intrastate aviation                                                                              Accomplishment of the initial inspections
                                                    in Alaska, and                                                (f) Compliance                                        required by paragraph (g) of this AD
                                                                                                                                                                        terminates all requirements of AD 2003–14–
                                                      (4) Will not have a significant                               Comply with this AD within the
                                                                                                                                                                        06.
                                                    economic impact, positive or negative,                        compliance times specified, unless already
                                                    on a substantial number of small entities                     done.                                                 (k) Alternative Methods of Compliance
                                                    under the criteria of the Regulatory                                                                                (AMOCs)
                                                                                                                  (g) Actions Required for Compliance
                                                    Flexibility Act.                                                                                                       (1) The Manager, Los Angeles Aircraft
                                                                                                                    Except as required by paragraph (h) of this         Certification Office, FAA, has the authority to
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                    List of Subjects in 14 CFR Part 39                            AD: Do all applicable actions identified as           approve AMOCs for this AD, if requested
                                                                                                                  required for compliance (‘‘RC’’) in, and in           using the procedures found in 14 CFR 39.19.
                                                      Air transportation, Aircraft, Aviation                      accordance with, the Accomplishment                   In accordance with 14 CFR 39.19, send your
                                                    safety, Incorporation by reference,                           Instructions of Boeing Alert Service Bulletin         request to your principal inspector or local
                                                    Safety.                                                       737–53A1349, dated August 23, 2016. Do the            Flight Standards District Office, as
                                                    The Proposed Amendment                                        actions at the applicable times specified in          appropriate. If sending information directly
                                                                                                                  paragraph 1.E., ‘‘Compliance,’’ of Boeing             to the manager of the ACO, send it to the
                                                      Accordingly, under the authority                            Alert Service Bulletin 737–53A1349, dated             attention of the person identified in
                                                    delegated to me by the Administrator,                         August 23, 2016.                                      paragraph (l)(1) of this AD. Information may



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                                                                              Federal Register / Vol. 82, No. 83 / Tuesday, May 2, 2017 / Proposed Rules                                            20453

                                                    be emailed to: 9-ANM-LAACO-AMOC-                          Issued in Renton, Washington, on April 24,          Directorate, 1601 Lind Avenue SW.,
                                                    Requests@faa.gov.                                       2017.                                                 Renton, WA. For information on the
                                                       (2) Before using any approved AMOC,                  Paul Bernado,                                         availability of this material at the FAA,
                                                    notify your appropriate principal inspector,            Acting Manager, Transport Airplane                    call 425–227–1221.
                                                    or lacking a principal inspector, the manager           Directorate, Aircraft Certification Service.
                                                    of the local flight standards district office/                                                                Examining the AD Docket
                                                                                                            [FR Doc. 2017–08831 Filed 5–1–17; 8:45 am]
                                                    certificate holding district office.                    BILLING CODE 4910–13–P                                   You may examine the AD docket on
                                                       (3) An AMOC that provides an acceptable                                                                    the Internet at http://
                                                    level of safety may be used for any repair,                                                                   www.regulations.gov by searching for
                                                    modification, or alteration required by this            DEPARTMENT OF TRANSPORTATION                          and locating Docket No. FAA–2017–
                                                    AD if it is approved by the Boeing                                                                            0331; or in person at the Docket
                                                    Commercial Airplanes Organization                       Federal Aviation Administration                       Management Facility between 9 a.m.
                                                    Designation Authorization (ODA) that has                                                                      and 5 p.m., Monday through Friday,
                                                    been authorized by the Manager, Seattle                 14 CFR Part 39                                        except Federal holidays. The AD docket
                                                    ACO, to make those findings. To be                                                                            contains this proposed AD, the
                                                                                                            [Docket No. FAA–2017–0331; Directorate
                                                    approved, the repair method, modification                                                                     regulatory evaluation, any comments
                                                                                                            Identifier 2016–NM–213–AD]
                                                    deviation, or alteration deviation must meet                                                                  received, and other information. The
                                                    the certification basis of the airplane, and the        RIN 2120–AA64
                                                                                                                                                                  street address for the Docket Operations
                                                    approval must specifically refer to this AD.                                                                  office (telephone 800–647–5527) is in
                                                       (4) Except as required by paragraph (h)(2)           Airworthiness Directives; Bombardier,
                                                                                                            Inc. Airplanes                                        the ADDRESSES section. Comments will
                                                    of this AD: For service information that
                                                                                                                                                                  be available in the AD docket shortly
                                                    contains steps that are labeled as Required             AGENCY: Federal Aviation                              after receipt.
                                                    for Compliance (RC), the provisions of
                                                                                                            Administration (FAA), DOT.                            FOR FURTHER INFORMATION CONTACT:
                                                    paragraphs (k)(4)(i) and (k)(4)(ii) of this AD
                                                    apply.                                                  ACTION: Notice of proposed rulemaking                 Fabio Buttitta, Aerospace Engineer,
                                                       (i) The steps labeled as RC, including               (NPRM).                                               Airframe and Mechanical Systems
                                                    substeps under an RC step and any figures                                                                     Branch, ANE–171, FAA, New York
                                                                                                            SUMMARY:   We propose to adopt a new                  Aircraft Certification Office (ACO), 1600
                                                    identified in an RC step, must be done to               airworthiness directive (AD) for certain
                                                    comply with the AD. If a step or substep is                                                                   Stewart Avenue, Suite 410, Westbury,
                                                                                                            Bombardier, Inc. Model DHC–8–102,                     NY 11590; telephone 516–228–7303; fax
                                                    labeled ‘‘RC Exempt,’’ then the RC
                                                                                                            –103, –106, –201, –202, –301, –311, and               516–794–5531.
                                                    requirement is removed from that step or
                                                                                                            –315 airplanes. This proposed AD was
                                                    substep. An AMOC is required for any                                                                          SUPPLEMENTARY INFORMATION:
                                                                                                            prompted by reports of undamped main
                                                    deviations to RC steps, including substeps
                                                                                                            landing gear (MLG) extension in-service.              Comments Invited
                                                    and identified figures.
                                                                                                            This proposed AD would require
                                                       (ii) Steps not labeled as RC may be                                                                          We invite you to send any written
                                                                                                            replacement of the MLG retraction
                                                    deviated from using accepted methods in                                                                       relevant data, views, or arguments about
                                                    accordance with the operator’s maintenance
                                                                                                            actuator rod-ends on both MLG
                                                                                                                                                                  this proposal. Send your comments to
                                                    or inspection program without obtaining
                                                                                                            assemblies. We are proposing this AD to
                                                                                                                                                                  an address listed under the ADDRESSES
                                                    approval of an AMOC, provided the RC steps,             address the unsafe condition on these
                                                                                                                                                                  section. Include ‘‘Docket No. FAA–
                                                    including substeps and identified figures, can          products.
                                                                                                                                                                  2017–0331; Directorate Identifier 2016–
                                                    still be done as specified, and the airplane            DATES:  We must receive comments on                   NM–213–AD’’ at the beginning of your
                                                    can be put back in an airworthy condition.              this proposed AD by June 16, 2017.                    comments. We specifically invite
                                                    (l) Related Information                                 ADDRESSES: You may send comments,                     comments on the overall regulatory,
                                                                                                            using the procedures found in 14 CFR                  economic, environmental, and energy
                                                       (1) For more information about this AD,
                                                                                                            11.43 and 11.45, by any of the following              aspects of this proposed AD. We will
                                                    contact Wade Sullivan, Aerospace Engineer,
                                                                                                            methods:                                              consider all comments received by the
                                                    Airframe Branch, ANM–120S, FAA, Seattle
                                                                                                              • Federal eRulemaking Portal: Go to                 closing date and may amend this
                                                    Aircraft Certification Office (ACO), 1601 Lind
                                                                                                            http://www.regulations.gov. Follow the                proposed AD based on those comments.
                                                    Avenue SW., Renton, WA 98057–3356;
                                                                                                            instructions for submitting comments.                   We will post all comments we
                                                    phone: 425–917–6430; fax: 425–917–6590;
                                                                                                              • Fax: 202–493–2251.                                receive, without change, to http://
                                                    email: wade.sullivan@faa.gov.
                                                                                                              • Mail: U.S. Department of                          www.regulations.gov, including any
                                                       (2) For information about AMOCs, contact
                                                    Jennifer Tsakoumakis, Airframe Branch,
                                                                                                            Transportation, Docket Operations, M–                 personal information you provide. We
                                                    ANM–120L, FAA, Los Angeles Aircraft
                                                                                                            30, West Building Ground Floor, Room                  will also post a report summarizing each
                                                    Certification Office (ACO), 3960 Paramount
                                                                                                            W12–140, 1200 New Jersey Avenue SE.,                  substantive verbal contact we receive
                                                    Boulevard, Lakewood, CA 90712–4137;                     Washington, DC 20590.                                 about this proposed AD.
                                                    phone: 562–627–5264; fax: 562–627–5210;                   • Hand Delivery: Deliver to Mail
                                                                                                            address above between 9 a.m. and 5                    Discussion
                                                    email: jennifer.tsakoumakis@faa.gov.
                                                       (3) For service information identified in            p.m., Monday through Friday, except                      Transport Canada Civil Aviation
                                                    this AD, contact Boeing Commercial                      Federal holidays.                                     (TCCA), which is the aviation authority
                                                    Airplanes, Attention: Contractual & Data                  For service information identified in               for Canada, has issued Canadian
                                                                                                            this NPRM, contact Bombardier, Inc., Q-               Airworthiness Directive CF–2016–36,
jstallworth on DSK7TPTVN1PROD with PROPOSALS




                                                    Services (C&DS), 2600 Westminster Blvd.,
                                                    MC 110–SK57, Seal Beach, CA 90740–5600;                 Series Technical Help Desk, 123 Garratt               dated December 6, 2016, (referred to
                                                    telephone 562–797–1717; Internet https://               Boulevard, Toronto, Ontario M3K 1Y5,                  after this as the Mandatory Continuing
                                                    www.myboeingfleet.com. You may view this                Canada; telephone 416–375–4000; fax                   Airworthiness Information, or ‘‘the
                                                    referenced service information at the FAA,              416–375–4539; email thd.qseries@                      MCAI’’), to correct an unsafe condition
                                                    Transport Airplane Directorate, 1601 Lind               aero.bombardier.com; Internet http://                 for certain Bombardier, Inc. Model
                                                    Avenue SW., Renton, WA. For information                 www.bombardier.com. You may view                      DHC–8–102, –103, –106, –201, –202,
                                                    on the availability of this material at the             this referenced service information at                –301, –311, and –315 airplanes. The
                                                    FAA, call 425–227–1221.                                 the FAA, Transport Airplane                           MCAI states:


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Document Created: 2017-05-02 00:04:48
Document Modified: 2017-05-02 00:04:48
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionProposed Rules
ActionNotice of proposed rulemaking (NPRM).
DatesWe must receive comments on this proposed AD by June 16, 2017.
ContactWade Sullivan, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office (ACO), 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917- 6430; fax: 425-917-6590; email: [email protected]
FR Citation82 FR 20450 
RIN Number2120-AA64
CFR AssociatedAir Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

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