83_FR_28005 83 FR 27889 - Airworthiness Directives; Pratt & Whitney Division Turbofan Engines

83 FR 27889 - Airworthiness Directives; Pratt & Whitney Division Turbofan Engines

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 83, Issue 116 (June 15, 2018)

Page Range27889-27891
FR Document2018-12830

We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engine models, including engines identified with suffixes -1C, -1E, -3, -3A, or -3B. This AD was prompted by the discovery of multiple cracked 4th stage low-pressure turbine (LPT) air seals in the fleet. This AD requires removal from service of certain 4th stage LPT air seals. We are issuing this AD to address the unsafe condition on these products.

Federal Register, Volume 83 Issue 116 (Friday, June 15, 2018)
[Federal Register Volume 83, Number 116 (Friday, June 15, 2018)]
[Rules and Regulations]
[Pages 27889-27891]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2018-12830]



========================================================================
Rules and Regulations
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains regulatory documents 
having general applicability and legal effect, most of which are keyed 
to and codified in the Code of Federal Regulations, which is published 
under 50 titles pursuant to 44 U.S.C. 1510.

The Code of Federal Regulations is sold by the Superintendent of Documents. 

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


Federal Register / Vol. 83, No. 116 / Friday, June 15, 2018 / Rules 
and Regulations

[[Page 27889]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0817; Product Identifier 2017-NE-30-AD; Amendment 
39-19314; AD 2018-13-02]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney Division Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for all 
Pratt & Whitney Division (PW) PW4052, PW4056, PW4060, PW4062, PW4062A, 
PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engine models, 
including engines identified with suffixes -1C, -1E, -3, -3A, or -3B. 
This AD was prompted by the discovery of multiple cracked 4th stage 
low-pressure turbine (LPT) air seals in the fleet. This AD requires 
removal from service of certain 4th stage LPT air seals. We are issuing 
this AD to address the unsafe condition on these products.

DATES: This AD is effective July 20, 2018.

ADDRESSES: For service information identified in this final rule, 
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. It is also 
available on the internet at http://www.regulations.gov by searching 
for and locating Docket No. FAA-2017-0817.

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-
0817; 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 final rule, the regulatory evaluation, any comments received, and 
other information. The address for Docket Operations (phone: 800-647-
5527) is U.S. Department of Transportation, Docket Operations, M-30, 
West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, 
Washington, DC 20590.

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: [email protected].

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 by adding an AD that would apply to all Pratt & Whitney 
Division (PW) PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, 
PW4158, PW4460, and PW4462 turbofan engine models, including engines 
identified with suffixes -1C, -1E, -3, -3A, or -3B. The NPRM published 
in the Federal Register on October 12, 2017 (82 FR 47405). The NPRM was 
prompted by the discovery of multiple cracked 4th stage LPT air seals, 
part number (P/N) 50N346, in the fleet. An investigation determined 
there is insufficient clearance to the 4th stage LPT vane cluster 
honeycomb that makes up the other half of the sealing system. Also, the 
knife edge seals are uncoated so they are more susceptible to 
overheating if a hard rub with the honeycomb occurs. The NPRM proposed 
to require the removal from service of certain 4th stage LPT air seals. 
Replacement of the air seal also requires replacement of the 4th stage 
LPT vane cluster honeycomb. This condition, if not corrected, could 
result in failure of the air seal, uncontained air seal release, damage 
to the engine, and damage to the airplane. We are issuing this AD to 
address the unsafe condition on these products.

Comments

    We gave the public the opportunity to participate in developing 
this final rule. The following presents the comments received on the 
NPRM and the FAA's response to each comment.

Request To Clarify Compliance Time

    United Parcel Service, United Airlines, SR Technics, Delta Airlines 
(DAL), Atlas Air, Federal Express (FedEx), and the Boeing Company 
requested that we clarify the compliance time requirement specified in 
the NPRM, paragraph (f)(1), which stated ``at the next disassembly of 
the LPT module, remove 4th stage air seal, P/N 50N346, from service and 
replace with a part eligible for installation'' because the term 
``disassembly'' is subjective and not defined elsewhere in the NPRM. 
DAL requested that we specify a compliance time in the final rule since 
paragraph (f)(1) of the NPRM indicates that the compliance actions 
should be done in accordance with the compliance times specified in the 
AD.
    We agree. We clarified that the compliance in this AD should be 
performed ``the next time the 4th stage LPT vanes are removed from the 
LPT module.''

Request for Clarification on Installation Prohibition

    DAL requested clarification on the acceptability of returning an 
LPT to service with P/N 50N346 installed if the air seal was not 
exposed at the piece-part level, because the LPT disassembly was 
limited.
    An LPT module with a 4th stage air seal, P/N 50N346, installed, may 
be returned to service, if the 4th stage LPT vanes are not removed. 
However, replacement of the 4th stage air seal is required, when the 
4th stage LPT vanes are removed. This would include, if the 4th stage 
LPT air seal was at the piece-part exposure level.

Request for Clarification on Replacement of Affected Air Seals

    Cathay Pacific Airways (CPA) asked if replacing the 4th stage LPT 
air seal, P/N 50N346, with any of the other 4th stage LPT air seals 
depicted in the Illustrated Parts Catalog (IPC) fulfills the AD 
requirement or if P/N 51N113 is the only suitable air seal for 
replacement. CPA further requested that we define what is ``a part 
eligible for installation''

[[Page 27890]]

in paragraph (f)(1) of the NPRM which states ``at the next disassembly 
of the LPT module, remove 4th stage air seal, P/N 50N346, from service 
and replace with a part eligible for installation.''
    Currently, P/N 51N113 is the only 4th stage LPT air seal suitable 
for P/N 50N346 replacement. However, new replacement air seals may be 
developed in the future. We did not change this AD.

Service Bulletin Comment

    CPA stated that PW Service Bulletin (SB) PW4ENG A72-830, Revision 
No. 1, dated May 2, 2017, listed P/N 51N113 as the only part eligible 
for installation. However, the service bulletin is not clearly listed 
in paragraph (f) of the NPRM.
    We disagree. We listed PW SB PW4ENG A72-830, Revision No. 1, dated 
May 2, 2017, in the ``Related Service Information'' section of the 
NPRM, which was the appropriate paragraph. We did not change this AD.

Request for Clarification on Applicability of AD

    Atlas Air asked if the AD applies to engines with 4th stage LPT air 
seals, P/N 51N038, 50N478, or 50N478-001, installed.
    We determined this AD only applies to engines with 4th stage LPT 
air seal, P/N 50N346, installed.

Request for Clarification on Repair Limits

    Atlas Air asked if PW Clean, Inspect, Repair (CIR) 72-53-40 
Inspection/Check-03 limits apply to the 4th stage LPT air seal, P/N 
51N113. If so, Atlas Air is concerned that the reduced knife edge might 
get scrapped due to reduced diameters.
    The intent of this AD is to install a 4th stage LPT air seal with 
reduced knife edge diameters. This AD does not impact the CIR 72-53-40 
Inspection/Check-03 limits.

Request for Clarification on Re-Installation Prohibition

    Atlas Air asked if 4th stage LPT air seals, P/N 51N038, 50N478, or 
50N478-001 are prohibited from re-installation.
    We determined that 4th stage LPT air seals, P/N 51N038, 50N478, and 
50N478-001, are not applicable to the engines affected by this AD.

Request for Clarification on Effective Date

    SR Technics asked when this AD will become effective.
    This AD will be effective 35 days after publication in the Federal 
Register.

Request for Clarification on Part Modification

    PW stated that the new part can be obtained by modification of the 
old part as specified in PW SB PW4ENG A72-830, Revision No. 1, dated 
May 2, 2017.
    We agree. The new 4th stage LPT air seal, P/N 51N113, can be 
obtained through modification of the old air seal, P/N 50N346, as noted 
in PW SB PW4ENG A72-830, Revision No. 1, dated May 2, 2017.

Request for Clarification on Honeycomb Replacement

    DAL and FedEx note that the NPRM states ``Replacement of the air 
seal also requires replacement of the 4th stage LPT vane cluster 
honeycomb'' in the ``Discussion'' paragraph. However, paragraph (f) in 
the NPRM does not address honeycomb replacement. The commenters asked 
if the FAA intends to require the replacement of the honeycomb.
    This AD addresses the unsafe condition created by a cracked 4th 
stage LPT air seal by replacing the air seal with a part that does not 
crack. Installation of the new air seal without replacement of the 4th 
stage LPT vane cluster honeycomb results in an increased radial 
clearance between the honeycomb and air seals. This is not an approved 
configuration. Requirements for replacement of the honeycomb when an 
air seal is replaced are defined in the appropriate service 
information, such as PW CIR Manual P/N 51A357, Chapter/Section 72-53-
24, Repair-02. We did not change this AD.

Supportive Comment

    The Air Line Pilots Association International expressed support for 
this AD.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
this final rule with the changes described previously and for minor 
editorial changes. We have determined that these minor changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this final 
rule.

Related Service Information

    We reviewed PW SB PW4ENG A72-830, Revision No. 1, dated May 02, 
2017. The SB describes procedures for replacement or modification of 
the 4th stage LPT air seals.

Costs of Compliance

    We estimate that this AD affects 991 engines installed on aircraft 
of U.S. registry.
    We estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
               Action                         Labor cost            Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Replacement of air seal............  0 work-hours x $85 per hour         $13,800         $13,800     $13,675,800
                                      = $0.
----------------------------------------------------------------------------------------------------------------

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

[[Page 27891]]

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

    This AD will not have federalism implications under Executive Order 
13132. This AD will 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 that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under 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.

Adoption of the Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 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):

2018-13-02 Pratt & Whitney Division: Amendment 39-19314; Docket No. 
FAA-2017-0817; Product Identifier 2017-NE-30-AD.

(a) Effective Date

    This AD is effective July 20, 2018.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all Pratt & Whitney Division (PW) PW4052, 
PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, 
and PW4462 turbofan engine models, including engines identified with 
suffixes -1C, -1E, -3, -3A, or -3B, with 4th stage low-pressure 
turbine (LPT) air seal, part number (P/N) 50N346, installed.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7240, Turbine Engine 
Combustion Section.

(e) Unsafe Condition

    This AD was prompted by the discovery of multiple cracked air 
seals. We are issuing this AD to prevent failure of the 4th stage 
LPT air seal. This unsafe condition, if not addressed, could result 
in uncontained release of the air seal, 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

    The next time the 4th stage LPT vanes are removed from the LPT 
module, remove 4th stage air seal, P/N 50N346, from service and 
replace with a part eligible for installation.

(h) Installation Prohibition

    After the effective date of this AD, do not install any 4th 
stage LPT air seal, P/N 50N346, into any LPT module.

(i) 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 (j) of this AD. You may email your request 
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.

(j) Related Information

    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: 
[email protected].

(k) Material Incorporated by Reference

    None.

    Issued in Burlington, Massachusetts, on June 11, 2018.
Robert J. Ganley,
Manager, Engine and Propeller Standards Branch, Aircraft Certification 
Service.
[FR Doc. 2018-12830 Filed 6-14-18; 8:45 am]
 BILLING CODE 4910-13-P



                                                                                                                                                                                                 27889

                                              Rules and Regulations                                                                                          Federal Register
                                                                                                                                                             Vol. 83, No. 116

                                                                                                                                                             Friday, June 15, 2018



                                              This section of the FEDERAL REGISTER                    Examining the AD Docket                                Comments
                                              contains regulatory documents having general
                                              applicability and legal effect, most of which             You may examine the AD docket on                       We gave the public the opportunity to
                                              are keyed to and codified in the Code of                the internet at http://                                participate in developing this final rule.
                                              Federal Regulations, which is published under           www.regulations.gov by searching for                   The following presents the comments
                                              50 titles pursuant to 44 U.S.C. 1510.                   and locating Docket No. FAA–2017–                      received on the NPRM and the FAA’s
                                                                                                      0817; or in person at Docket Operations                response to each comment.
                                              The Code of Federal Regulations is sold by              between 9 a.m. and 5 p.m., Monday
                                              the Superintendent of Documents.                                                                               Request To Clarify Compliance Time
                                                                                                      through Friday, except Federal holidays.
                                                                                                      The AD docket contains this final rule,                   United Parcel Service, United
                                                                                                      the regulatory evaluation, any                         Airlines, SR Technics, Delta Airlines
                                              DEPARTMENT OF TRANSPORTATION
                                                                                                      comments received, and other                           (DAL), Atlas Air, Federal Express
                                              Federal Aviation Administration                         information. The address for Docket                    (FedEx), and the Boeing Company
                                                                                                      Operations (phone: 800–647–5527) is                    requested that we clarify the compliance
                                              14 CFR Part 39                                          U.S. Department of Transportation,                     time requirement specified in the
                                                                                                      Docket Operations, M–30, West                          NPRM, paragraph (f)(1), which stated
                                                                                                      Building Ground Floor, Room W12–140,                   ‘‘at the next disassembly of the LPT
                                              [Docket No. FAA–2017–0817; Product
                                                                                                      1200 New Jersey Avenue SE,                             module, remove 4th stage air seal, P/N
                                              Identifier 2017–NE–30–AD; Amendment
                                              39–19314; AD 2018–13–02]                                Washington, DC 20590.                                  50N346, from service and replace with
                                                                                                                                                             a part eligible for installation’’ because
                                                                                                      FOR FURTHER INFORMATION CONTACT: Jo-
                                                                                                                                                             the term ‘‘disassembly’’ is subjective
                                              RIN 2120–AA64                                           Ann Theriault, Aerospace Engineer,
                                                                                                                                                             and not defined elsewhere in the NPRM.
                                                                                                      ECO Branch, FAA, 1200 District
                                              Airworthiness Directives; Pratt &                                                                              DAL requested that we specify a
                                                                                                      Avenue, Burlington, MA 01803; phone:
                                              Whitney Division Turbofan Engines                                                                              compliance time in the final rule since
                                                                                                      781–238–7105; fax: 781–238–7199;
                                                                                                                                                             paragraph (f)(1) of the NPRM indicates
                                                                                                      email: jo-ann.theriault@faa.gov.
                                              AGENCY:Federal Aviation                                                                                        that the compliance actions should be
                                                                                                      SUPPLEMENTARY INFORMATION:                             done in accordance with the compliance
                                              Administration (FAA), DOT.
                                                                                                      Discussion                                             times specified in the AD.
                                              ACTION:   Final rule.                                                                                             We agree. We clarified that the
                                                                                                        We issued a notice of proposed                       compliance in this AD should be
                                              SUMMARY:   We are adopting a new                        rulemaking (NPRM) to amend 14 CFR                      performed ‘‘the next time the 4th stage
                                              airworthiness directive (AD) for all Pratt              part 39 by adding an AD that would                     LPT vanes are removed from the LPT
                                              & Whitney Division (PW) PW4052,                         apply to all Pratt & Whitney Division                  module.’’
                                              PW4056, PW4060, PW4062, PW4062A,                        (PW) PW4052, PW4056, PW4060,
                                              PW4152, PW4156A, PW4158, PW4460,                        PW4062, PW4062A, PW4152,                               Request for Clarification on Installation
                                              and PW4462 turbofan engine models,                      PW4156A, PW4158, PW4460, and                           Prohibition
                                              including engines identified with                       PW4462 turbofan engine models,                           DAL requested clarification on the
                                              suffixes –1C, –1E, –3, –3A, or –3B. This                including engines identified with                      acceptability of returning an LPT to
                                              AD was prompted by the discovery of                     suffixes –1C, –1E, –3, –3A, or –3B. The                service with P/N 50N346 installed if the
                                              multiple cracked 4th stage low-pressure                 NPRM published in the Federal                          air seal was not exposed at the piece-
                                              turbine (LPT) air seals in the fleet. This              Register on October 12, 2017 (82 FR                    part level, because the LPT disassembly
                                              AD requires removal from service of                     47405). The NPRM was prompted by the                   was limited.
                                              certain 4th stage LPT air seals. We are                 discovery of multiple cracked 4th stage                  An LPT module with a 4th stage air
                                              issuing this AD to address the unsafe                   LPT air seals, part number (P/N)                       seal, P/N 50N346, installed, may be
                                              condition on these products.                            50N346, in the fleet. An investigation                 returned to service, if the 4th stage LPT
                                              DATES:   This AD is effective July 20,                  determined there is insufficient                       vanes are not removed. However,
                                              2018.                                                   clearance to the 4th stage LPT vane                    replacement of the 4th stage air seal is
                                                                                                      cluster honeycomb that makes up the                    required, when the 4th stage LPT vanes
                                              ADDRESSES:   For service information                    other half of the sealing system. Also,                are removed. This would include, if the
                                              identified in this final rule, contact Pratt            the knife edge seals are uncoated so they              4th stage LPT air seal was at the piece-
                                              & Whitney Division, 400 Main St., East                  are more susceptible to overheating if a               part exposure level.
                                              Hartford, CT 06118; phone: 800–565–                     hard rub with the honeycomb occurs.
                                              0140; fax: 860–565–5442. You may view                   The NPRM proposed to require the                       Request for Clarification on
                                              this service information at the FAA,                    removal from service of certain 4th stage              Replacement of Affected Air Seals
                                              Engine and Propeller Standards Branch,                  LPT air seals. Replacement of the air                     Cathay Pacific Airways (CPA) asked if
                                              1200 District Avenue, Burlington, MA                    seal also requires replacement of the 4th              replacing the 4th stage LPT air seal, P/
sradovich on DSK3GMQ082PROD with RULES




                                              01803. For information on the                           stage LPT vane cluster honeycomb. This                 N 50N346, with any of the other 4th
                                              availability of this material at the FAA,               condition, if not corrected, could result              stage LPT air seals depicted in the
                                              call 781–238–7759. It is also available                 in failure of the air seal, uncontained air            Illustrated Parts Catalog (IPC) fulfills the
                                              on the internet at http://                              seal release, damage to the engine, and                AD requirement or if P/N 51N113 is the
                                              www.regulations.gov by searching for                    damage to the airplane. We are issuing                 only suitable air seal for replacement.
                                              and locating Docket No. FAA–2017–                       this AD to address the unsafe condition                CPA further requested that we define
                                              0817.                                                   on these products.                                     what is ‘‘a part eligible for installation’’


                                         VerDate Sep<11>2014   15:57 Jun 14, 2018   Jkt 244001   PO 00000   Frm 00001   Fmt 4700   Sfmt 4700   E:\FR\FM\15JNR1.SGM   15JNR1


                                              27890                   Federal Register / Vol. 83, No. 116 / Friday, June 15, 2018 / Rules and Regulations

                                              in paragraph (f)(1) of the NPRM which                         impact the CIR 72–53–40 Inspection/                   cluster honeycomb results in an
                                              states ‘‘at the next disassembly of the                       Check-03 limits.                                      increased radial clearance between the
                                              LPT module, remove 4th stage air seal,                                                                              honeycomb and air seals. This is not an
                                                                                                            Request for Clarification on Re-
                                              P/N 50N346, from service and replace                                                                                approved configuration. Requirements
                                                                                                            Installation Prohibition
                                              with a part eligible for installation.’’                                                                            for replacement of the honeycomb when
                                                Currently, P/N 51N113 is the only 4th                         Atlas Air asked if 4th stage LPT air                an air seal is replaced are defined in the
                                              stage LPT air seal suitable for P/N                           seals, P/N 51N038, 50N478, or 50N478–                 appropriate service information, such as
                                              50N346 replacement. However, new                              001 are prohibited from re-installation.              PW CIR Manual P/N 51A357, Chapter/
                                                                                                              We determined that 4th stage LPT air                Section 72–53–24, Repair-02. We did
                                              replacement air seals may be developed
                                                                                                            seals, P/N 51N038, 50N478, and                        not change this AD.
                                              in the future. We did not change this
                                                                                                            50N478–001, are not applicable to the
                                              AD.                                                                                                                 Supportive Comment
                                                                                                            engines affected by this AD.
                                              Service Bulletin Comment                                                                                              The Air Line Pilots Association
                                                                                                            Request for Clarification on Effective
                                                CPA stated that PW Service Bulletin                         Date                                                  International expressed support for this
                                              (SB) PW4ENG A72–830, Revision No. 1,                            SR Technics asked when this AD will                 AD.
                                              dated May 2, 2017, listed P/N 51N113                          become effective.                                     Conclusion
                                              as the only part eligible for installation.                     This AD will be effective 35 days after
                                              However, the service bulletin is not                          publication in the Federal Register.                     We reviewed the relevant data,
                                              clearly listed in paragraph (f) of the                                                                              considered the comments received, and
                                              NPRM.                                                         Request for Clarification on Part                     determined that air safety and the
                                                                                                            Modification                                          public interest require adopting this
                                                We disagree. We listed PW SB
                                              PW4ENG A72–830, Revision No. 1,                                 PW stated that the new part can be                  final rule with the changes described
                                              dated May 2, 2017, in the ‘‘Related                           obtained by modification of the old part              previously and for minor editorial
                                              Service Information’’ section of the                          as specified in PW SB PW4ENG A72–                     changes. We have determined that these
                                              NPRM, which was the appropriate                               830, Revision No. 1, dated May 2, 2017.               minor changes:
                                              paragraph. We did not change this AD.                           We agree. The new 4th stage LPT air                    • Are consistent with the intent that
                                                                                                            seal, P/N 51N113, can be obtained                     was proposed in the NPRM for
                                              Request for Clarification on                                  through modification of the old air seal,             addressing the unsafe condition; and
                                              Applicability of AD                                           P/N 50N346, as noted in PW SB                            • Do not add any additional burden
                                                Atlas Air asked if the AD applies to                        PW4ENG A72–830, Revision No. 1,                       upon the public than was already
                                              engines with 4th stage LPT air seals, P/                      dated May 2, 2017.                                    proposed in the NPRM.
                                              N 51N038, 50N478, or 50N478–001,                              Request for Clarification on Honeycomb                   We also determined that these
                                              installed.                                                    Replacement                                           changes will not increase the economic
                                                We determined this AD only applies                             DAL and FedEx note that the NPRM                   burden on any operator or increase the
                                              to engines with 4th stage LPT air seal,                       states ‘‘Replacement of the air seal also             scope of this final rule.
                                              P/N 50N346, installed.                                        requires replacement of the 4th stage                 Related Service Information
                                              Request for Clarification on Repair                           LPT vane cluster honeycomb’’ in the
                                                                                                            ‘‘Discussion’’ paragraph. However,                      We reviewed PW SB PW4ENG A72–
                                              Limits
                                                                                                            paragraph (f) in the NPRM does not                    830, Revision No. 1, dated May 02,
                                                Atlas Air asked if PW Clean, Inspect,                       address honeycomb replacement. The                    2017. The SB describes procedures for
                                              Repair (CIR) 72–53–40 Inspection/                             commenters asked if the FAA intends to                replacement or modification of the 4th
                                              Check-03 limits apply to the 4th stage                        require the replacement of the                        stage LPT air seals.
                                              LPT air seal, P/N 51N113. If so, Atlas                        honeycomb.                                            Costs of Compliance
                                              Air is concerned that the reduced knife                          This AD addresses the unsafe
                                              edge might get scrapped due to reduced                        condition created by a cracked 4th stage                We estimate that this AD affects 991
                                              diameters.                                                    LPT air seal by replacing the air seal                engines installed on aircraft of U.S.
                                                The intent of this AD is to install a 4th                   with a part that does not crack.                      registry.
                                              stage LPT air seal with reduced knife                         Installation of the new air seal without                We estimate the following costs to
                                              edge diameters. This AD does not                              replacement of the 4th stage LPT vane                 comply with this AD:

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

                                              Replacement of air seal ..................................   0 work-hours × $85 per hour = $0 .................         $13,800         $13,800    $13,675,800



                                              Authority for This Rulemaking                                    We are issuing this rulemaking under               is within the scope of that authority
                                                                                                            the authority described in Subtitle VII,              because it addresses an unsafe condition
                                                Title 49 of the United States Code                          Part A, Subpart III, Section 44701:                   that is likely to exist or develop on
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                                              specifies the FAA’s authority to issue                        ‘‘General requirements’’. Under that                  products identified in this rulemaking
                                              rules on aviation safety. Subtitle I,                         section, Congress charges the FAA with                action.
                                              section 106, describes the authority of                       promoting safe flight of civil aircraft in               This AD is issued in accordance with
                                              the FAA Administrator. Subtitle VII:                          air commerce by prescribing regulations               authority delegated by the Executive
                                              Aviation Programs, describes in more                          for practices, methods, and procedures                Director, Aircraft Certification Service,
                                              detail the scope of the Agency’s                              the Administrator finds necessary for                 as authorized by FAA Order 8000.51C.
                                              authority.                                                    safety in air commerce. This regulation               In accordance with that order, issuance


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                                                                   Federal Register / Vol. 83, No. 116 / Friday, June 15, 2018 / Rules and Regulations                                         27891

                                              of ADs is normally a function of the                    PW4062, PW4062A, PW4152, PW4156A,                      DEPARTMENT OF TRANSPORTATION
                                              Compliance and Airworthiness                            PW4158, PW4460, and PW4462 turbofan
                                              Division, but during this transition                    engine models, including engines identified            Federal Aviation Administration
                                              period, the Executive Director has                      with suffixes –1C, –1E, –3, –3A, or –3B, with
                                                                                                      4th stage low-pressure turbine (LPT) air seal,         14 CFR Part 39
                                              delegated the authority to issue ADs
                                                                                                      part number (P/N) 50N346, installed.
                                              applicable to engines, propellers, and                                                                         [Docket No. FAA–2018–0501; Product
                                              associated appliances to the Manager,                   (d) Subject                                            Identifier 2018–NE–19–AD; Amendment 39–
                                              Engine and Propeller Standards Branch,                    Joint Aircraft System Component (JASC)               19304; AD 2018–11–16]
                                              Policy and Innovation Division.                         Code 7240, Turbine Engine Combustion
                                                                                                      Section.                                               RIN 2120–AA64
                                              Regulatory Findings
                                                This AD will not have federalism                      (e) Unsafe Condition                                   Airworthiness Directives; Engine
                                              implications under Executive Order                        This AD was prompted by the discovery of             Alliance Turbofan Engines
                                              13132. This AD will not have a                          multiple cracked air seals. We are issuing
                                                                                                                                                             AGENCY:  Federal Aviation
                                              substantial direct effect on the States, on             this AD to prevent failure of the 4th stage
                                                                                                      LPT air seal. This unsafe condition, if not
                                                                                                                                                             Administration (FAA), DOT.
                                              the relationship between the national                                                                          ACTION: Final rule; request for
                                                                                                      addressed, could result in uncontained
                                              government and the States, or on the                    release of the air seal, damage to the engine,         comments.
                                              distribution of power and                               and damage to the airplane.
                                              responsibilities among the various                                                                             SUMMARY:    We are adopting a new
                                              levels of government.                                   (f) Compliance                                         airworthiness directive (AD) for certain
                                                For the reasons discussed above, I                      Comply with this AD within the                       Engine Alliance (EA) GP7270, GP7272,
                                              certify that this AD:                                   compliance times specified, unless already             and GP7277 turbofan engines. This AD
                                                (1) Is not a ‘‘significant regulatory                 done.                                                  requires a one-time eddy current
                                              action’’ under Executive Order 12866,                   (g) Required Actions                                   inspection (ECI) of the engine fan hub
                                                (2) Is not a ‘‘significant rule’’ under                                                                      blade slot bottom and blade slot front
                                              DOT Regulatory Policies and Procedures                    The next time the 4th stage LPT vanes are
                                                                                                      removed from the LPT module, remove 4th                edge for cracks, a visual inspection of
                                              (44 FR 11034, February 26, 1979),                                                                              the engine fan hub for damage, and
                                                (3) Will not affect intrastate aviation               stage air seal, P/N 50N346, from service and
                                                                                                      replace with a part eligible for installation.         removal of parts if damage or defects are
                                              in Alaska and                                                                                                  found that are outside serviceable
                                                (4) Will not have a significant                       (h) Installation Prohibition
                                                                                                                                                             limits. This AD was prompted by an
                                              economic impact, positive or negative,                    After the effective date of this AD, do not          uncontained failure of the engine fan
                                              on a substantial number of small entities               install any 4th stage LPT air seal, P/N                hub. We are issuing this AD to address
                                              under the criteria of the Regulatory                    50N346, into any LPT module.                           the unsafe condition on these products.
                                              Flexibility Act.
                                                                                                      (i) Alternative Methods of Compliance                  DATES: This AD is effective July 2, 2018.
                                              List of Subjects in 14 CFR Part 39                      (AMOCs)                                                  The Director of the Federal Register
                                                Air transportation, Aircraft, Aviation                   (1) The Manager, ECO Branch, FAA, has               approved the incorporation by reference
                                              safety, Incorporation by reference,                     the authority to approve AMOCs for this AD,            of a certain publication listed in this AD
                                              Safety.                                                 if requested using the procedures found in 14          as of July 2, 2018.
                                                                                                      CFR 39.19. In accordance with 14 CFR 39.19,              We must receive comments on this
                                              Adoption of the Amendment                               send your request to your principal inspector          AD by July 30, 2018.
                                                Accordingly, under the authority                      or local flight standards district office, as
                                                                                                      appropriate. If sending information directly           ADDRESSES: You may send comments,
                                              delegated to me by the Administrator,                                                                          using the procedures found in 14 CFR
                                                                                                      to the manager of the certification office,
                                              the FAA amends 14 CFR part 39 as                        send it to the attention of the person                 11.43 and 11.45, by any of the following
                                              follows:                                                identified in paragraph (j) of this AD. You            methods:
                                                                                                      may email your request to: ANE-AD-AMOC@                  • Federal eRulemaking Portal: Go to
                                              PART 39—AIRWORTHINESS                                   faa.gov.                                               http://www.regulations.gov. Follow the
                                              DIRECTIVES                                                 (2) Before using any approved AMOC,                 instructions for submitting comments.
                                              ■ 1. The authority citation for part 39
                                                                                                      notify your appropriate principal inspector,             • Fax: 202–493–2251.
                                              continues to read as follows:
                                                                                                      or lacking a principal inspector, the manager            • Mail: U.S. Department of
                                                                                                      of the local flight standards district office/         Transportation, Docket Operations, M–
                                                  Authority: 49 U.S.C. 106(g), 40113, 44701.          certificate holding district office.
                                                                                                                                                             30, West Building Ground Floor, Room
                                              § 39.13   [Amended]                                     (j) Related Information                                W12–140, 1200 New Jersey Avenue SE,
                                                                                                        For more information about this AD,                  Washington, DC 20590.
                                              ■ 2. The FAA amends § 39.13 by adding
                                                                                                      contact Jo-Ann Theriault, Aerospace                      • Hand Delivery: U.S. Department of
                                              the following new airworthiness
                                                                                                      Engineer, ECO Branch, FAA, 1200 District               Transportation, Docket Operations, M–
                                              directive (AD):
                                                                                                      Avenue, Burlington, MA 01803; phone: 781–              30, West Building Ground Floor, Room
                                              2018–13–02 Pratt & Whitney Division:                    238–7105; fax: 781–238–7199; email: jo-                W12–140, 1200 New Jersey Avenue SE,
                                                  Amendment 39–19314; Docket No.                      ann.theriault@faa.gov.                                 Washington, DC 20590, between 9 a.m.
                                                  FAA–2017–0817; Product Identifier
                                                  2017–NE–30–AD.                                      (k) Material Incorporated by Reference                 and 5 p.m., Monday through Friday,
                                                                                                        None.
                                                                                                                                                             except Federal holidays.
                                              (a) Effective Date                                                                                               For service information identified in
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                                                This AD is effective July 20, 2018.                     Issued in Burlington, Massachusetts, on              this final rule, contact Engine Alliance,
                                                                                                      June 11, 2018.                                         411 Silver Lane, East Hartford, CT
                                              (b) Affected ADs
                                                                                                      Robert J. Ganley,                                      06118; phone: 800–565–0140; email:
                                                None.                                                 Manager, Engine and Propeller Standards                help24@pw.utc.com; website:
                                              (c) Applicability                                       Branch, Aircraft Certification Service.                www.engineallianceportal.com. You
                                                 This AD applies to all Pratt & Whitney               [FR Doc. 2018–12830 Filed 6–14–18; 8:45 am]            may view this service information at the
                                              Division (PW) PW4052, PW4056, PW4060,                   BILLING CODE 4910–13–P                                 FAA, Engine and Propeller Standards


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Document Created: 2018-11-02 12:01:17
Document Modified: 2018-11-02 12:01:17
CategoryRegulatory Information
CollectionFederal Register
sudoc ClassAE 2.7:
GS 4.107:
AE 2.106:
PublisherOffice of the Federal Register, National Archives and Records Administration
SectionRules and Regulations
ActionFinal rule.
DatesThis AD is effective July 20, 2018.
ContactJo-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 Citation83 FR 27889 
RIN Number2120-AA64
CFR AssociatedAir Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

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