83 FR 34070 - Airworthiness Directives; Pratt & Whitney Division (PW) Turbofan Engines

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 83, Issue 139 (July 19, 2018)

Page Range		34070-34072
FR Document		2018-15291

We propose to adopt a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines with a low pressure compressor (LPC) fan hub, part number (P/N) 51B821 or P/N 52B521, installed. This proposed AD was prompted by updated low cycle fatigue analysis techniques that indicate certain LPC fan hubs could crack prior to their published life limit. This proposed AD would require repetitive eddy current inspections (ECIs) and fluorescent penetrant inspections (FPIs) for cracks in certain LPC fan hubs and removal of hubs from service that fail inspection. We are proposing this AD to address the unsafe condition on these products.

Federal Register, Volume 83 Issue 139 (Thursday, July 19, 2018)

[Federal Register Volume 83, Number 139 (Thursday, July 19, 2018)]
[Proposed Rules]
[Pages 34070-34072]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2018-15291]


========================================================================
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. 83, No. 139 / Thursday, July 19, 2018 / 
Proposed Rules

[[Page 34070]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0368; Product Identifier 2018-NE-12-AD]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney Division (PW) Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all 
Pratt & Whitney Division (PW) PW4074D, PW4077D, PW4084D, PW4090, and 
PW4090-3 turbofan engines with a low pressure compressor (LPC) fan hub, 
part number (P/N) 51B821 or P/N 52B521, installed. This proposed AD was 
prompted by updated low cycle fatigue analysis techniques that indicate 
certain LPC fan hubs could crack prior to their published life limit. 
This proposed AD would require repetitive eddy current inspections 
(ECIs) and fluorescent penetrant inspections (FPIs) for cracks in 
certain LPC fan hubs and removal of hubs from service that fail 
inspection. We are proposing this AD to address the unsafe condition on 
these products.

DATES: We must receive comments on this proposed AD by September 4, 
2018.

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 Pratt & 
Whitney Division, 400 Main St., East Hartford, CT 06118; phone: 800-
565-0140; fax: 860-565-5442. You may view this service information at 
the FAA, Engine and Propeller Standards Branch, 1200 District Avenue, 
Burlington, MA 01803. For information on the availability of this 
material at the FAA, call 781-238-7759.

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-2018-
0368; or in person at Docket Operations between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays. The AD docket contains 
this NPRM, the regulatory evaluation, any comments received, and other 
information. The street address for Docket Operations (phone: 800-647-
5527) is listed above. Comments will be available in the AD docket 
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Jo-Ann Theriault, Aerospace Engineer, 
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 
781-238-7105; fax: 781-238-7199; email: jo-ann.theriault@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-2018-0368; 
Product Identifier 2018-NE-12-AD'' at the beginning of your comments. 
We specifically invite comments on the overall regulatory, economic, 
environmental, and energy aspects of this NPRM. We will consider all 
comments received by the closing date and may amend this NPRM 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 NPRM.

Discussion

    We received information concerning an updated analysis by the 
engine manufacturer, which indicated certain triple-bore LPC fan hubs 
installed in high-thrust models of the PW4000-112'' series turbofan 
engine could crack prior to their published life limit. This proposed 
AD would add additional inspections of affected triple-bore LPC fan 
hubs until they are removed from service and replaced with a part 
eligible for installation. This condition, if not addressed, could 
result in fatigue cracking of the LPC fan hub, uncontained hub failure, 
damage to the engine, and damage to the airplane.

Related Service Information Under 1 CFR Part 51

    We reviewed PW Alert Service Bulletin (ASB) PW4G-112-A72-351, dated 
February 22, 2018. This PW ASB describes procedures for performing LPC 
fan hub ECIs and FPIs. 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.

Other Related Service Information

    We reviewed PW PW4000 Series 112 Inch Turbofan Engines Cleaning, 
Inspection and Repair (CIR) Manual, P/N 51A750, Chapter/Section 72-31-
07, Inspection/Check-02, Revision No. 76, dated March 15, 2018. The CIR 
Manual contains additional information regarding FPI and ECI of the LPC 
fan hub.

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 repetitive ECIs and FPIs of the LPC 
fan hub.

Costs of Compliance

    We estimate that this proposed AD affects 32 engines installed on 
airplanes of U.S. registry. We estimate the following costs to comply 
with this proposed AD:

[[Page 34071]]



                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Pro-rated part cost...................  0 work-hours x $85 per          $288,000        $288,000        $288,000
                                         hour = $0.
Inspection............................  40 work-hours x $85 per                0           3,400         108,800
                                         hour = $3,400.
----------------------------------------------------------------------------------------------------------------

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.
    This AD is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to engines, propellers, and 
associated appliances to the Manager, Engine and Propeller Standards 
Branch, Policy and Innovation Division.

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):

Pratt & Whitney Division: Docket No. FAA-2018-0368; Product 
Identifier 2018-NE-12-AD.

(a) Comments Due Date

    We must receive comments by September 4, 2018.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all Pratt & Whitney Division (PW) PW4074D, 
PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines with low-
pressure compressor (LPC) fan hub, part number (P/N) 51B821 or P/N 
52B521, installed.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7230, Turbine Engine 
Compressor Section.

(e) Unsafe Condition

    This AD was prompted by low cycle fatigue analysis techniques, 
updated by the engine manufacturer, which indicated certain LPC fan 
hubs could crack prior to their published life limit. We are issuing 
this AD to prevent failure of the LPC fan hub. The unsafe condition, 
if not addressed, could result in uncontained hub release, damage to 
the engine, and damage to the airplane.

(f) Compliance

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

(g) Required Actions

    (1) After the effective date of this AD, perform a fluorescent 
penetrant inspection (FPI) and eddy current inspection (ECI) of the 
LPC fan hub the next time the engine is separated at the M-flange 
and the LPC fan hub has accumulated 2,000 or more flight cycles 
since the last FPI and ECI.
    (2) Thereafter, perform an FPI and an ECI of the LPC fan hub 
every time the engine is separated at the M-flange and the LPC fan 
hub has accumulated 2,000 or more flight cycles since the last LPC 
fan hub ECI and FPI inspections.
    (3) Use the Accomplishment Instructions, Step No. 11, in PW 
Alert Service Bulletin PW4G-112-A72-351, dated February 22, 2018, to 
do the eddy current inspections.
    (4) If a crack is found during the inspections required by 
paragraphs (g)(1) or (2) of this AD, remove the LPC fan hub from 
service before further flight and replace with a part eligible for 
installation.

(h) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, ECO Branch, 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 
certification office, send it to the attention of the person 
identified in paragraph (i)(1) of this AD. You may email your 
request to: ANE-AD-AMOC@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.

(i) Related Information

    (1) For more information about this AD, contact Jo-Ann 
Theriault, Aerospace Engineer, ECO Branch, FAA, 1200 District 
Avenue, Burlington, MA 01803; phone: 781-238-7105; fax: 781-238-
7199; email: jo-ann.theriault@faa.gov.
    (2) For service information identified in this AD, contact Pratt 
& Whitney Division, 400 Main St., East Hartford, CT 06118; phone: 
800-565-0140; fax: 860-565-5442. You may view this referenced 
service information at the FAA, Engine and Propeller Standards 
Branch, 1200 District Avenue, Burlington, MA 01803. For information 
on the availability of this material at the FAA, call 781-238-7759.


[[Page 34072]]


    Issued in Burlington, Massachusetts, on July 12, 2018.
Robert J. Ganley,
Acting Manager, Engine and Propeller Standards Branch, Aircraft 
Certification Service.
[FR Doc. 2018-15291 Filed 7-18-18; 8:45 am]
 BILLING CODE 4910-13-P

34070

Proposed Rules Federal Register
Vol. 83, No. 139

Thursday, July 19, 2018

This section of the FEDERAL REGISTER • Hand Delivery: Deliver to Mail Discussion
contains notices to the public of the proposed address above between 9 a.m. and 5
issuance of rules and regulations. The We received information concerning
p.m., Monday through Friday, except an updated analysis by the engine
purpose of these notices is to give interested Federal holidays.
persons an opportunity to participate in the manufacturer, which indicated certain
For service information identified in triple-bore LPC fan hubs installed in
rule making prior to the adoption of the final
rules.
this NPRM, contact Pratt & Whitney high-thrust models of the PW4000–112″
Division, 400 Main St., East Hartford, series turbofan engine could crack prior
CT 06118; phone: 800–565–0140; fax: to their published life limit. This
DEPARTMENT OF TRANSPORTATION 860–565–5442. You may view this proposed AD would add additional
service information at the FAA, Engine inspections of affected triple-bore LPC
Federal Aviation Administration and Propeller Standards Branch, 1200 fan hubs until they are removed from
District Avenue, Burlington, MA 01803. service and replaced with a part eligible
14 CFR Part 39 For information on the availability of for installation. This condition, if not
this material at the FAA, call 781–238– addressed, could result in fatigue
[Docket No. FAA–2018–0368; Product 7759.
Identifier 2018–NE–12–AD] cracking of the LPC fan hub,
Examining the AD Docket uncontained hub failure, damage to the
RIN 2120–AA64
You may examine the AD docket on engine, and damage to the airplane.
Airworthiness Directives; Pratt & the internet at http:// Related Service Information Under 1
Whitney Division (PW) Turbofan www.regulations.gov by searching for CFR Part 51
Engines and locating Docket No. FAA–2018–
We reviewed PW Alert Service
0368; or in person at Docket Operations
AGENCY: Federal Aviation Bulletin (ASB) PW4G–112–A72–351,
between 9 a.m. and 5 p.m., Monday
Administration (FAA), DOT. dated February 22, 2018. This PW ASB
through Friday, except Federal holidays.
describes procedures for performing
ACTION: Notice of proposed rulemaking The AD docket contains this NPRM, the
LPC fan hub ECIs and FPIs. This service
(NPRM). regulatory evaluation, any comments
information is reasonably available
received, and other information. The
SUMMARY: We propose to adopt a new because the interested parties have
street address for Docket Operations
airworthiness directive (AD) for all Pratt access to it through their normal course
(phone: 800–647–5527) is listed above.
& Whitney Division (PW) PW4074D, of business or by the means identified
Comments will be available in the AD
PW4077D, PW4084D, PW4090, and in the ADDRESSES section.
docket shortly after receipt.
PW4090–3 turbofan engines with a low FOR FURTHER INFORMATION CONTACT: Jo- Other Related Service Information
pressure compressor (LPC) fan hub, part Ann Theriault, Aerospace Engineer,
number (P/N) 51B821 or P/N 52B521, We reviewed PW PW4000 Series 112
ECO Branch, FAA, 1200 District Inch Turbofan Engines Cleaning,
installed. This proposed AD was Avenue, Burlington, MA 01803; phone:
prompted by updated low cycle fatigue Inspection and Repair (CIR) Manual, P/
781–238–7105; fax: 781–238–7199; N 51A750, Chapter/Section 72–31–07,
analysis techniques that indicate certain email: jo-ann.theriault@faa.gov.
LPC fan hubs could crack prior to their Inspection/Check-02, Revision No. 76,
SUPPLEMENTARY INFORMATION: dated March 15, 2018. The CIR Manual
published life limit. This proposed AD
would require repetitive eddy current Comments Invited contains additional information
inspections (ECIs) and fluorescent regarding FPI and ECI of the LPC fan
We invite you to send any written hub.
penetrant inspections (FPIs) for cracks relevant data, views, or arguments about
in certain LPC fan hubs and removal of this proposal. Send your comments to FAA’s Determination
hubs from service that fail inspection. an address listed under the ADDRESSES We are proposing this AD because we
We are proposing this AD to address the section. Include ‘‘Docket No. FAA– evaluated all the relevant information
unsafe condition on these products. 2018–0368; Product Identifier 2018– and determined the unsafe condition
DATES: We must receive comments on NE–12–AD’’ at the beginning of your described previously is likely to exist or
this proposed AD by September 4, 2018. comments. We specifically invite develop in other products of the same
ADDRESSES: You may send comments, comments on the overall regulatory, type design.
using the procedures found in 14 CFR economic, environmental, and energy
11.43 and 11.45, by any of the following aspects of this NPRM. We will consider Proposed AD Requirements
methods: all comments received by the closing This proposed AD would require
• Federal eRulemaking Portal: Go to date and may amend this NPRM repetitive ECIs and FPIs of the LPC fan
http://www.regulations.gov. Follow the because of those comments.
sradovich on DSK3GMQ082PROD with PROPOSALS

hub.
instructions for submitting comments. We will post all comments we
• Fax: 202–493–2251. receive, without change, to http:// Costs of Compliance
• Mail: U.S. Department of www.regulations.gov, including any We estimate that this proposed AD
Transportation, Docket Operations, personal information you provide. We affects 32 engines installed on airplanes
M–30, West Building Ground Floor, will also post a report summarizing each of U.S. registry. We estimate the
Room W12–140, 1200 New Jersey substantive verbal contact we receive following costs to comply with this
Avenue SE, Washington, DC 20590. about this NPRM. proposed AD:

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Federal Register / Vol. 83, No. 139 / Thursday, July 19, 2018 / Proposed Rules 34071

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

Pro-rated part cost .......................................... 0 work-hours × $85 per hour = $0 ................. $288,000 $288,000 $288,000
Inspection ........................................................ 40 work-hours × $85 per hour = $3,400 ........ 0 3,400 108,800

Authority for This Rulemaking (4) Will not have a significant (f) Compliance
Title 49 of the United States Code economic impact, positive or negative, Comply with this AD within the
specifies the FAA’s authority to issue on a substantial number of small entities compliance times specified, unless already
rules on aviation safety. Subtitle I, under the criteria of the Regulatory done.
section 106, describes the authority of Flexibility Act. (g) Required Actions
the FAA Administrator. Subtitle VII: List of Subjects in 14 CFR Part 39 (1) After the effective date of this AD,
Aviation Programs, describes in more perform a fluorescent penetrant inspection
detail the scope of the Agency’s Air transportation, Aircraft, Aviation (FPI) and eddy current inspection (ECI) of the
authority. safety, Incorporation by reference, LPC fan hub the next time the engine is
We are issuing this rulemaking under Safety. separated at the M-flange and the LPC fan
the authority described in Subtitle VII, hub has accumulated 2,000 or more flight
Part A, Subpart III, Section 44701: The Proposed Amendment cycles since the last FPI and ECI.
‘‘General requirements.’’ Under that (2) Thereafter, perform an FPI and an ECI
Accordingly, under the authority of the LPC fan hub every time the engine is
section, Congress charges the FAA with delegated to me by the Administrator, separated at the M-flange and the LPC fan
promoting safe flight of civil aircraft in the FAA proposes to amend 14 CFR part hub has accumulated 2,000 or more flight
air commerce by prescribing regulations 39 as follows: cycles since the last LPC fan hub ECI and FPI
for practices, methods, and procedures inspections.
the Administrator finds necessary for PART 39—AIRWORTHINESS (3) Use the Accomplishment Instructions,
safety in air commerce. This regulation DIRECTIVES Step No. 11, in PW Alert Service Bulletin
is within the scope of that authority PW4G–112–A72–351, dated February 22,
because it addresses an unsafe condition 2018, to do the eddy current inspections.
■ 1. The authority citation for part 39
that is likely to exist or develop on (4) If a crack is found during the
continues to read as follows: inspections required by paragraphs (g)(1) or
products identified in this rulemaking
Authority: 49 U.S.C. 106(g), 40113, 44701. (2) of this AD, remove the LPC fan hub from
action.
service before further flight and replace with
This AD is issued in accordance with § 39.13 [Amended] a part eligible for installation.
authority delegated by the Executive
Director, Aircraft Certification Service, ■ 2. The FAA amends § 39.13 by adding (h) Alternative Methods of Compliance
as authorized by FAA Order 8000.51C. the following new airworthiness (AMOCs)
In accordance with that order, issuance directive (AD): (1) The Manager, ECO Branch, FAA, has
of ADs is normally a function of the Pratt & Whitney Division: Docket No. FAA– the authority to approve AMOCs for this AD,
Compliance and Airworthiness 2018–0368; Product Identifier 2018–NE– if requested using the procedures found in 14
Division, but during this transition 12–AD. CFR 39.19. In accordance with 14 CFR 39.19,
send your request to your principal inspector
period, the Executive Director has (a) Comments Due Date or local flight standards district office, as
delegated the authority to issue ADs appropriate. If sending information directly
We must receive comments by September
applicable to engines, propellers, and to the manager of the certification office,
4, 2018.
associated appliances to the Manager, send it to the attention of the person
Engine and Propeller Standards Branch, (b) Affected ADs identified in paragraph (i)(1) of this AD. You
Policy and Innovation Division. None. may email your request to: ANE-AD-AMOC@
faa.gov.
Regulatory Findings (c) Applicability (2) Before using any approved AMOC,
We determined that this proposed AD This AD applies to all Pratt & Whitney notify your appropriate principal inspector,
would not have federalism implications Division (PW) PW4074D, PW4077D, or lacking a principal inspector, the manager
under Executive Order 13132. This PW4084D, PW4090, and PW4090–3 turbofan of the local flight standards district office/
engines with low-pressure compressor (LPC) certificate holding district office.
proposed AD would not have a
fan hub, part number (P/N) 51B821 or P/N
substantial direct effect on the States, on (i) Related Information
52B521, installed.
the relationship between the national (1) For more information about this AD,
government and the States, or on the (d) Subject contact Jo-Ann Theriault, Aerospace
distribution of power and Joint Aircraft System Component (JASC) Engineer, ECO Branch, FAA, 1200 District
responsibilities among the various Code 7230, Turbine Engine Compressor Avenue, Burlington, MA 01803; phone: 781–
levels of government. Section. 238–7105; fax: 781–238–7199; email: jo-
For the reasons discussed above, I ann.theriault@faa.gov.
(e) Unsafe Condition (2) For service information identified in
sradovich on DSK3GMQ082PROD with PROPOSALS

certify this proposed regulation:
(1) Is not a ‘‘significant regulatory This AD was prompted by low cycle this AD, contact Pratt & Whitney Division,
fatigue analysis techniques, updated by the 400 Main St., East Hartford, CT 06118;
action’’ under Executive Order 12866, engine manufacturer, which indicated certain phone: 800–565–0140; fax: 860–565–5442.
(2) Is not a ‘‘significant rule’’ under LPC fan hubs could crack prior to their You may view this referenced service
the DOT Regulatory Policies and published life limit. We are issuing this AD information at the FAA, Engine and Propeller
Procedures (44 FR 11034, February 26, to prevent failure of the LPC fan hub. The Standards Branch, 1200 District Avenue,
1979), unsafe condition, if not addressed, could Burlington, MA 01803. For information on
(3) Will not affect intrastate aviation result in uncontained hub release, damage to the availability of this material at the FAA,
in Alaska, and the engine, and damage to the airplane. call 781–238–7759.

VerDate Sep<11>2014 16:14 Jul 18, 2018 Jkt 244001 PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 E:\FR\FM\19JYP1.SGM 19JYP1

Document Created: 2018-07-19 01:35:25
Document Modified: 2018-07-19 01:35:25

Category		Regulatory Information
Collection		Federal Register
sudoc Class		AE 2.7: GS 4.107: AE 2.106:
Publisher		Office of the Federal Register, National Archives and Records Administration
Section		Proposed Rules
Action		Notice of proposed rulemaking (NPRM).
Dates		We must receive comments on this proposed AD by September 4, 2018.
Contact		Jo-Ann Theriault, Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7105; fax: 781-238-7199; email: [email protected]
FR Citation		83 FR 34070
RIN Number		2120-AA64
CFR Associated		Air Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

83 FR 34070 - Airworthiness Directives; Pratt & Whitney Division (PW) Turbofan Engines

DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration

Federal Register Volume 83, Issue 139 (July 19, 2018)

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration