80 FR 81788 - Airworthiness Directives; The Boeing Company Airplanes

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 80, Issue 251 (December 31, 2015)

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 777-200 and -300 series airplanes equipped with Pratt and Whitney engines. This proposed AD was prompted by reports of blocked drain lines at the engine forward strut that caused flammable fluid to accumulate in a flammable leakage zone. This proposed AD would require doing the following actions on the left strut and right strut: A one-time cleaning of certain forward strut drain lines; installing new forward strut drain lines and insulation blankets; a leak check of the forward strut drain lines; and repair if any leak is found. This proposed AD would also require revising the maintenance or inspection program, as applicable, to incorporate a certain airworthiness limitation. We are proposing this AD to prevent blockage of forward strut drain lines, which could cause flammable fluids to collect in the forward strut area and potentially cause an uncontrolled fire or cause failure of engine attachment structure and consequent airplane loss.

[Federal Register Volume 80, Number 251 (Thursday, December 31, 2015)]
[Proposed Rules]
[Pages 81788-81792]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2015-32852]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-8130; Directorate Identifier 2014-NM-175-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain The Boeing Company Model 777-200 and -300 series airplanes 
equipped with Pratt and Whitney engines. This proposed AD was prompted 
by reports of blocked drain lines at the engine forward strut that 
caused flammable fluid to accumulate in a flammable leakage zone. This 
proposed AD would require doing the following actions on the left strut 
and right strut: A one-time cleaning of certain forward strut drain 
lines; installing new forward strut drain lines and insulation 
blankets; a leak check of the forward strut drain lines; and repair if 
any leak is found. This proposed AD would also require revising the 
maintenance or inspection program, as applicable, to incorporate a 
certain airworthiness limitation. We are proposing this AD to prevent 
blockage of forward strut drain lines, which could cause flammable 
fluids to collect in the forward strut area and potentially cause an 
uncontrolled fire or cause failure of engine attachment structure and 
consequent airplane loss.

DATES: We must receive comments on this proposed AD by February 16, 
2016.

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 proposed AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
P.O. Box 3707,

[[Page 81789]]

MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-5000, extension 1; 
fax 206-766-5680; 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-2015-8130.

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-2015-
8130; 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: Kevin Nguyen, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification Office 
(ACO), 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917-
6501; fax: 425-917-6590; email: [email protected].

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-2015-8130; 
Directorate Identifier 2014-NM-175-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

    We received multiple reports of the forward drain lines of the 
engine struts being blocked with coked particles. Coked particles form 
when hydraulic fluid is exposed to, and degraded by, the high 
temperatures of the hot core zone of the engine and the hot pneumatic 
bleed ducts. In two events, fluids backed up into the electrical (left) 
side of the disconnect box assembly of the strut system, causing an 
electrical fault that resulted in a false engine indicating and crew-
alerting system (EICAS) message for overheat detection. Flammable 
fluids collecting in the electrical side of the disconnect box assembly 
of the strut system can cause an electrical fault for electrical 
components, and create a potential ignition source for trapped 
flammable fluids that can lead to a fire.
    In three other events, flammable fluids backed up and pooled in the 
fluid (right) side of the disconnect box assembly of the strut system. 
Flammable fluids collecting in the disconnect box assembly of the strut 
system are a fire hazard because that area has no fire detection, 
containment, or extinguishing capability, and with an ignition source 
can result in an uncontrolled fire in the strut. Also, flammable fluids 
pooling in the disconnect box assembly of the strut system can spill 
over onto the engine and initiate an engine fire in the engine core 
cavity compartment.
    Hydraulic fluid collecting in the disconnect box assembly of the 
strut system can cause contamination and hydrogen embrittlement of the 
titanium structure resulting in cracks that can compromise the engine 
firewall by allowing a fire in the engine area to enter the strut; or 
by allowing flammable fluids to leak down and initiate an engine fire 
in the engine core cavity compartment, and also compromise the engine 
fire extinguishing system. Hydraulic fluid contamination, including 
contamination caused by hydraulic fluid in its liquid, vapor, and/or 
solid (i.e., coked) form, in the strut forward dry bay can lead to 
hydrogen embrittlement of the titanium fittings of the forward engine 
mount bulkhead and also the consequent inability of the fittings to 
carry engine loads, resulting in the loss or separation of an engine. 
Hydrogen embrittlement could also cause a through-crack formation 
across the fittings through which an engine fire could breach into the 
strut, resulting in an uncontained strut fire. We are proposing this AD 
to prevent blockage of forward strut drain lines, which could cause 
flammable fluids to collect in the forward strut area and potentially 
cause an uncontrolled fire or cause failure of engine attachment 
structure and consequent airplane loss.

Related Service Information Under 1 CFR Part 51

    We reviewed the following service information:
     Boeing Special Attention Service Bulletin 777-71-0055, 
Revision 1, dated April 15, 2015. The service information describes 
procedures for installing new forward strut drain lines and insulation 
blankets on the left and right engines.
     Boeing Special Attention Service Bulletin 777-54-0028, 
Revision 1, dated December 10, 2013. This service information describes 
procedures for a general visual inspection for hydraulic fluid 
contamination of the interior of the strut forward dry bay and 
corrective actions.
     Airworthiness Limitation 54-AWL-01, ``Forward Strut Drain 
Line'' as specified in Section D.4, Pratt and Whitney Forward Strut 
Drain Line, dated March 2014, of the Boeing 777 Maintenance Planning 
Data (MPD) Document Section 9, Airworthiness Limitations (AWLs) and 
Certification Maintenance Requirements (CMRs), D622W001-9, dated 
October 2014. This service information describes an airworthiness 
limitation task for the functional check of the forward strut drain 
line.
    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 of this 
NPRM.

FAA's Determination

    We are proposing this AD because we evaluated all the relevant 
information and determined 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 accomplishing the actions specified 
in the service information described previously. For information on the 
procedures and compliance times specified in Boeing Special Attention 
Service Bulletin 777-71-0055, Revision 1, dated April 15, 2015; and 
Boeing Special Attention Service Bulletin 777-54-0028, Revision 1, 
dated December 10, 2013: See this service information at http://www.regulations.gov by searching for and locating Docket No. FAA-2015-
8130.
    The phrase ``corrective actions'' is used in this proposed AD. 
``Corrective actions'' are actions that correct or address any 
condition found. Corrective actions in an AD could include, for 
example, repairs.

[[Page 81790]]

    This proposed AD would require revisions to certain operator 
maintenance documents to include a new airworthiness limitation 
containing repetitive functional checks of the forward engine strut 
drain line. Compliance with these actions is required by 14 CFR 
91.403(c). For airplanes that have been previously modified, altered, 
or repaired in the areas addressed by this AD, the operator may not be 
able to accomplish the actions described in the revisions. In this 
situation, to comply with 14 CFR 91.403(c), the operator must request 
approval for an alternative method of compliance in accordance with the 
procedures specified in paragraph (k) of this AD. The request should 
include a description of changes to the required inspections that will 
ensure the continued operational safety of the airplane.

Other Relevant Rulemaking

    On September 23, 2014, we issued AD 2014-20-10, Amendment 39-17983 
(79 FR 60331, October 7, 2014), for certain The Boeing Company Model 
777-200 and -300 series airplanes equipped with Pratt & Whitney 
engines. AD 2014-20-10 currently requires repetitive general visual 
inspections of the strut forward dry bay for the presence of hydraulic 
fluid, and related investigative and corrective actions (including 
checking drain lines for blockage due to hydraulic fluid coking; 
cleaning or replacing drain lines to allow drainage) if necessary; and 
adds airplanes to the applicability. AD 2014-20-10 was prompted by 
reports of hydraulic fluid contamination (including contamination 
caused by hydraulic fluid in its liquid, vapor, and/or solid (coked) 
form) found in the strut forward dry bay.
    The actions required by AD 2014-20-10, Amendment 39-17983 (79 FR 
60331, October 7, 2014), are intended to detect and correct hydraulic 
fluid contamination of the strut forward dry bay, which could result in 
hydrogen embrittlement of the titanium forward engine mount bulkhead 
fittings, and consequent inability of the fittings to carry engine 
loads and resulting in engine separation. Hydrogen embrittlement could 
also cause a through-crack formation across the fittings through which 
an engine fire could breach into the strut, resulting in an uncontained 
strut fire.
    Accomplishment of the actions specified below terminates the 
inspections required by paragraph (g) of AD 2014-20-10, Amendment 39-
17983 (79 FR 60331, October 7, 2014), at the modified area only; 
provided the actions are accomplished concurrently, or the actions 
specified below for Boeing Special Attention Service Bulletin 777-54-
0028, Revision 1, dated December 10, 2013, are done after accomplishing 
the actions specified in paragraphs (g)(1) through (g)(5) of this 
proposed AD.
     The actions specified in paragraphs (g)(1) through (g)(4) 
of this proposed AD on the left and right struts, done in accordance 
with the Accomplishment Instructions of Boeing Special Attention 
Service Bulletin 777-71-0055, Revision 1, dated April 15, 2015; and the 
revision done as specified in paragraph (g)(5) of this proposed AD.
     A one-time general visual inspection for hydraulic fluid 
contamination of the interior of the strut forward dry bay, and all 
applicable related investigative and corrective actions, done in 
accordance with the Accomplishment Instructions of Boeing Special 
Attention Service Bulletin 777-54-0028, Revision 1, dated December 10, 
2013.
    On August 14, 2015, we issued AD 2015-17-13, Amendment 39-18246 (80 
FR 52948, September 2, 2015) for certain The Boeing Company Model 777-
200 and -300 series airplanes equipped with Pratt and Whitney engines. 
AD 2015-17-13 currently requires repetitive functional checks for 
blockage of the forward strut drain line, and doing corrective actions 
(including cleaning or replacing any blocked drain lines) if necessary; 
and a one-time cleaning of certain forward strut drain lines. AD 2015-
17-13 also includes an optional terminating action, which specifies 
accomplishing the actions in Boeing Special Attention Service Bulletin 
777-71-0055, Revision 1, dated April 15, 2015 and incorporating 
Airworthiness Limitation 54-AWL-01, ``Forward Strut Drain Line'' into 
the maintenance or inspection program, as applicable. AD 2015-17-13 was 
prompted by reports of blocked drain lines at the engine forward strut 
that caused flammable fluid to accumulate in a flammable leakage zone. 
The actions required by AD 2015-17-13 are intended to detect and 
correct blockage of forward strut drain lines, which could cause 
flammable fluids to collect in the forward strut area and potentially 
cause an uncontrolled fire or cause failure of engine attachment 
structure and consequent airplane loss.
    Accomplishment of the actions required by paragraph (g) of this 
proposed AD (doing the actions specified Boeing Special Attention 
Service Bulletin 777-71-0055, Revision 1, dated April 15, 2015; and 
incorporating Airworthiness Limitation 54-AWL-01, ``Forward Strut Drain 
Line'' as specified in Section D.4, Pratt and Whitney Forward Strut 
Drain Line, dated March 2014, of the Boeing 777 Maintenance Planning 
Data (MPD) Document Section 9, Airworthiness Limitations (AWLs) and 
Certification Maintenance Requirements (CMRs), D622W001-9, dated 
October 2014, into the maintenance or inspection program, as 
applicable) would terminate the actions required by paragraph (g) of AD 
2015-17-13, Amendment 39-18246 (80 FR 52948, September 2, 2015), at the 
modified area only.

Explanation of ``RC'' Steps in Service Information

    The FAA worked in conjunction with industry, under the 
Airworthiness Directive Implementation Aviation Rulemaking Committee 
(ARC), to enhance the AD system. One enhancement was a new process for 
annotating which steps in the service information are required for 
compliance with an AD. Differentiating these steps from other tasks in 
the service information is expected to improve an owner's/operator's 
understanding of crucial AD requirements and help provide consistent 
judgment in AD compliance. The steps identified as Required for 
Compliance (RC) in any service information identified previously have a 
direct effect on detecting, preventing, resolving, or eliminating an 
identified unsafe condition.
    For service information that contains steps that are labeled as RC, 
the following provisions apply: (1) 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, and an AMOC is required for any 
deviations to RC steps, including substeps and identified figures; and 
(2) 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.

Costs of Compliance

    We estimate that this proposed AD affects 54 airplanes of U.S. 
registry.
    We estimate the following costs to comply with this proposed AD:

[[Page 81791]]



                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
               Action                        Labor cost           Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
Installing new drain lines and        16 work-hours x $85 per         $17,080          $18,440         $995,760
 insulation blankets, doing a leak     hour = $1,360.
 check, and revising the maintenance
 or inspection program.
----------------------------------------------------------------------------------------------------------------

    We have received no definitive data that would enable us to provide 
cost estimates for the on-condition actions specified in this proposed 
AD.
    According to the manufacturer, some of the costs of this proposed 
AD may be covered under warranty, thereby reducing the cost impact on 
affected individuals. We do not control warranty coverage for affected 
individuals. As a result, we have included all costs in our cost 
estimate.

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-2015-8130; Directorate Identifier 
2014-NM-175-AD.

(a) Comments Due Date

    We must receive comments by February 16, 2016.

(b) Affected ADs

    This AD affects the ADs specified in paragraphs (b)(1) and 
(b)(2) of this AD.
    (1) AD 2014-20-10, Amendment 39-17983 (79 FR 60331, October 7, 
2014).
    (2) AD 2015-17-13, Amendment 39-18246 (80 FR 52948, September 2, 
2015).

(c) Applicability

    This AD applies to The Boeing Company Model 777-200 and -300 
series airplanes, certificated in any category, equipped with Pratt 
& Whitney engines, as identified in Boeing Special Attention Service 
Bulletin 777-71-0055, Revision 1, dated April 15, 2015.

(d) Subject

    Air Transport Association (ATA) of America Code 71, Powerplant.

(e) Unsafe Condition

    This AD was prompted by reports of blocked drain lines at the 
engine forward strut that caused flammable fluid to accumulate in a 
flammable leakage zone. We are issuing this AD to prevent blockage 
of forward strut drain lines, which could cause flammable fluids to 
collect in the forward strut area and potentially cause an 
uncontrolled fire or cause failure of engine attachment structure 
and consequent airplane loss.

(f) Compliance

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

(g) Actions

    Within 4,000 flight cycles or 750 days after the effective date 
of this AD, whichever occurs later: Accomplish the actions specified 
in paragraphs (g)(1) through (g)(4) of this AD on the left and right 
struts, in accordance with the Accomplishment Instructions of Boeing 
Special Attention Service Bulletin 777-71-0055, Revision 1, dated 
April 15, 2015; and accomplish the revision specified in paragraph 
(g)(5) of this AD.
    (1) Disconnect and remove the forward strut drain lines.
    (2) Clean the left system disconnect, the strut forward lower 
spar, and the forward fireseal pan drain lines.
    (3) Install new forward strut drain lines and insulation 
blankets.
    (4) Do a leak check of the forward strut drain lines, for any 
leak, and repair if any leak is found.
    (5) Revise the maintenance or inspection program, as applicable, 
to incorporate Airworthiness Limitation 54-AWL-01, ``Forward Strut 
Drain Line'' as specified in Section D.4, Pratt and Whitney Forward 
Strut Drain Line, dated March 2014, of the Boeing 777 Maintenance 
Planning Data (MPD) Document Section 9, Airworthiness Limitations 
(AWLs) and Certification Maintenance Requirements (CMRs), D622W001-
9, dated October 2014. The initial compliance time for Airworthiness 
Limitation 54-AWL-01 is within 2,000 flight cycles or 1,500 days, 
whichever occurs first, after doing the actions specified in 
paragraphs (g)(1) through (g)(4) of this AD.

(h) No Alternative Actions or Intervals

    After accomplishing the revision required by paragraph (g)(5) of 
this AD, no alternative actions (e.g., inspections) or intervals may 
be used unless the actions or intervals are approved as an 
alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (k) of this AD.

(i) Terminating Action for Other ADs

    (1) Accomplishing the actions required by paragraph (g) of this 
AD terminates the actions required by paragraph (g) of AD 2015-17-
13, Amendment 39-18246 (80 FR

[[Page 81792]]

52948, September 2, 2015, at the modified area only.
    (2) Accomplishing the actions specified in paragraphs (i)(2)(i) 
and (i)(2)(ii) of this AD terminates the inspections required by 
paragraph (g) of AD 2014-20-10, Amendment 39-17983 (79 FR 60331, 
October 7, 2014), at the modified area only, provided the actions 
are accomplished concurrently, or the actions specified in paragraph 
(i)(2)(ii) of this AD are done after accomplishing the actions 
specified in paragraph (i)(2)(i) of this AD.
    (i) The actions specified in paragraphs (g)(1) through (g)(4) of 
this AD on the left and right struts are done in accordance with the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 777-71-0055, Revision 1, dated April 15, 2015; and the 
revision specified in paragraph (g)(5) of this AD is done.
    (ii) A one-time general visual inspection for hydraulic fluid 
contamination (including contamination caused by hydraulic fluid in 
its liquid, vapor, and/or solid (coked) form) of the interior of the 
strut forward dry bay, and all applicable related investigative and 
corrective actions (including checking drain lines for blockage due 
to hydraulic fluid coking, and cleaning or replacing drain lines to 
allow drainage) are done in accordance with the Accomplishment 
Instructions of Boeing Special Attention Service Bulletin 777-54-
0028, Revision 1, dated December 10, 2013, except where Boeing 
Special Attention Service Bulletin 777-54-0028, Revision 1, dated 
December 10, 2013, specifies to contact Boeing for repair, the 
repair must be done using a method approved in accordance with the 
procedures specified in paragraph (k) of this AD.

(j) Credit for Previous Actions

    This paragraph provides credit for actions required by paragraph 
(g) of this AD, if those actions were performed before the effective 
date of this AD using Boeing Special Attention Service Bulletin 777-
71-0055, dated June 12, 2014, which is not incorporated by reference 
in this AD.

(k) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Seattle Aircraft Certification Office (ACO), 
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 be emailed to: [email protected].
    (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) For service information that contains steps that are labeled 
as Required for Compliance (RC), the provisions of paragraphs 
(k)(3)(i) and (k)(3)(ii) 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. 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 Kevin Nguyen, 
Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Seattle 
Aircraft Certification Office (ACO), 1601 Lind Avenue SW., Renton, 
WA 98057-3356; phone: 425-917-6501; fax: 425-917-6590; email: 
[email protected].
    (2) For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-
5000, extension 1; fax 206-766-5680; 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 December 21, 2015.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2015-32852 Filed 12-30-15; 8:45 am]
BILLING CODE 4910-13-P