Document ID: FAA-2021-0959-0009
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: Pratt and Whitney Division Turbofan Engines
Posted Date: 2022-03-11T05:00Z

[Federal Register Volume 87, Number 48 (Friday, March 11, 2022)]
[Rules and Regulations]
[Pages 13923-13926]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-05296]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0959; Project Identifier AD-2021-00830-E; 
Amendment 39-21975; AD 2022-06-09]
RIN 2120-AA64

Airworthiness Directives; Pratt & Whitney Division Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2019-03-01 
and AD 2021-05-51 for certain Pratt & Whitney Division (PW) PW4074, 
PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 model turbofan 
engines. AD 2019-03-01 required performing initial and repetitive 
thermal acoustic image (TAI) inspections for cracks in certain 1st-
stage low-pressure compressor (LPC) blades and removal of those blades 
that fail inspection. AD 2021-05-51 required performing a one-time TAI 
inspection for cracks in certain 1st-stage LPC blades and removal of 
those blades that fail inspection. This AD was prompted by three in-
flight failures of a 1st-stage LPC blade, with one failure resulting in 
an engine fire during flight, and subsequent manufacturer publication 
of service information specifying improved inspections for three 
critical locations on the 1st-stage LPC blade. This AD requires initial 
and repetitive ultrasonic (UT) inspections and TAI inspections for 
cracks in certain 1st-stage LPC blades and removal of those blades that 
fail inspection. The FAA is issuing this AD to address the unsafe 
condition on these products.

DATES: This AD is effective April 15, 2022.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of April 15, 
2022.

ADDRESSES: For service information identified in this final rule, 
contact Pratt & Whitney Division, 400 Main Street, East Hartford, CT 
06118; phone: (860) 565-0140; email: [email protected]; website: 
https://connect.prattwhitney.com. You may view this service information 
at the FAA, Airworthiness Products Section, Operational Safety Branch, 
1200 District Avenue, Burlington, MA 01803. For information on the 
availability of this material at the FAA, call (817) 222-5110. It is 
also available at https://www.regulations.gov by searching for and 
locating Docket No. FAA-2021-0959.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.govby 
searching for and locating Docket No. FAA-2021-0959; 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, any 
comments received, and other information. The address for Docket 
Operations 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: Carol Nguyen, Aviation Safety 
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; 
phone: (781) 238-7655; fax: (781) 238-7199; email: 
[email protected].

SUPPLEMENTARY INFORMATION:

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to supersede AD 2019-03-01, Amendment 39-19553 (84 FR 4320, 
February 15, 2019) (AD 2019-03-01), and AD 2021-05-51, Amendment 39-
21470 (86 FR 13445, March 9, 2021) (AD 2021-05-51). AD 2019-03-01 and 
AD 2021-05-51 applied to certain PW PW4074, PW4074D, PW4077, PW4077D, 
PW4084D, PW4090, and PW4090-3 model turbofan engines. The NPRM 
published in the Federal Register on December 28, 2021 (86 FR 73699). 
The NPRM was prompted by the manufacturer developing an improved UT 
inspection for the three critical locations on the 1st-stage LPC blade, 
two at the mid span region of the blade and one at the flow path region 
of the blade, following three in-flight failures of a 1st-stage LPC 
blade, with one failure resulting in an engine fire during flight. The 
manufacturer published Pratt & Whitney Alert Service Bulletin (ASB) 
PW4G-112-A72-361, dated October 15, 2021, which provides instructions 
for performing both the improved UT inspection and the TAI inspection. 
The manufacturer also determined that it was necessary to adjust the 
initial TAI inspection threshold and lower the repetitive TAI 
inspection interval on the 1st-stage LPC blades to address the unsafe 
condition. In the NPRM, the FAA proposed to require initial and 
repetitive UT inspections and TAI inspections for cracks in certain 
1st-stage LPC blades and removal of those blades that fail inspection.

Discussion of Final Airworthiness Directive

Comments

    The FAA received comments from five commenters. The commenters were 
Air Line Pilots Association, International (ALPA), All Nippon Airways 
(ANA), The Boeing Company (Boeing), Japan Airlines (JAL), and United 
Airlines (UAL). The following presents the comments received on the 
NPRM and the FAA's response to each comment.

Request To Revise Note and Add Additional Note in Required Actions

    UAL requested that the FAA revise Note 2 to paragraph (g)(1)(ii) of 
the NPRM [Note 1 to paragraph (g)(1)(ii) of this AD] to ``The FAA-
approved TAI inspection method and the vendors that can perform the 
FAA-approved TAI inspection are specified in the Accomplishment 
Instructions section and Vendor Services section of PW4G-112-A72-361, 
respectively.'' UAL also requested that the FAA add the same note to 
paragraph (g)(2)(iii) of this AD.
    The FAA agrees and revised Note 1 to paragraph (g)(1)(ii) of this 
AD and added Note 2 to paragraph (g)(2)(iii) to this AD, as requested 
by UAL.

Request To Change the Initial Compliance Time to Before Revenue Flight

    ANA requested that the FAA change the Required Actions, paragraph 
(g)(1) Initial 1st-stage LPC Blade Inspections, from ``before further 
flight after the effective of this AD'' to ``before the next revenue 
flight'' to clarify the ferry flight requirement.
    Similarly, JAL requested the FAA change the Required Actions, 
paragraph (g)(1) Initial 1st-stage LPC Blade Inspections, from ``before 
further flight after the effective of this AD'' to ``before the next 
revenue flight'' or ``before further flight except the ferry flight 
without passenger and cargos.''
    The FAA disagrees with changing the initial compliance in paragraph 
(g) of this AD as requested by ANA and JAL. The FAA has determined it 
is necessary to require certain actions prior to any flight, except as 
permitted in paragraph (i), Special Flight Permit, of this AD.

[[Page 13924]]

Request To Add Aircraft Maintenance Manual Task to Special Flight 
Permit

    ANA and UAL requested that paragraph (h)(2) of the proposed AD 
(paragraph (i)(2) of this AD) include Task 29-11-00-710-806 of the 
Boeing 777-200/300 Aircraft Maintenance Manual as an acceptable method 
for accomplishing the functional check of the left and right hydraulic 
pump shutoff valves.
    The FAA agrees and has added Task 29-11-00-710-806 of the Boeing 
777-200/300 Aircraft Maintenance Manual to Note 3 to paragraph (i)(2) 
of this AD as guidance for accomplishing the actions in paragraph 
(i)(2), Special Flight Permit, of this AD.

Request To Add Certain Exceptions for Ferry Flights

    JAL requested that the FAA revise the AD to include certain 
exceptions for ferry flights. JAL stated it is planning to ferry 
affected airplanes to a storage point in the United States. JAL 
commented that although the local authority in Japan provides 
regulatory requirements for special flight permissions which are 
similar to 14 CFR 21.197, Special flight permits, the Japanese 
regulatory requirements do not include ``to a point of storage'' 
language for the purpose of the flights. JAL proposed to add the 
following wording to paragraphs (c) and (g), Applicability and Required 
Actions, respectively, of this AD, ``except for ferry flights, without 
passenger and cargo, of the airplanes on which the actions specified in 
paragraphs (h)(1) and (h)(2) of this AD [paragraphs (i)(1) and (2) of 
this AD] have been done.''
    The FAA disagrees with revising paragraph (c) Applicability or 
paragraph (g) Required Actions of this AD in response to JAL's comment. 
Paragraph (i), Special Flight Permit, provides that special flight 
permits, as described in 14 CFR 21.197 and 21.199, are permitted 
provided that the actions in paragraphs (i)(1) and (2) of this AD have 
first been accomplished. 14 CFR 21.197(a)(1) provides, in relevant 
part, that a special flight permit may be issued for flying the 
aircraft to a base where repairs, alterations, or maintenance are to be 
performed, or to a point of storage. The requested change is already 
permitted by this AD. The FAA did not change this AD as a result of 
this comment.

Request To Provide a Threshold for the Special Flight Permit

    JAL and UAL requested that the FAA provide a threshold in paragraph 
(h)(1) of the proposed AD [paragraph (i)(1) of this AD] for the flow 
path UT inspection of the 1st-stage LPC blades for cracking prior to 
obtaining a special flight permit. JAL suggested a threshold of 275 
flight cycles (FCs) since the last flow path UT inspection for 1st-
stage LPC blades that have zero cycles since new (CSN) and also for 
1st-stage LPC blades that have accumulated any number of CSN greater 
than zero.
    UAL stated that omitting a compliance time in paragraph (h) of the 
proposed AD for the special flight permits creates ambiguity regarding 
when and how often the flow path UT inspection is required for special 
flight permits. UAL suggested a threshold of 275 FCs since the last 
flow path UT inspection.
    The FAA agrees to add a threshold of 275 FCs to paragraph (i)(1) of 
this AD. This allows airplanes with 1st-stage LPC blades that have 
accumulated 275 CSN or fewer to be eligible for a special flight 
permit.

Request To Define Part Eligible for Installation

    JAL requested that the FAA define the 1st-stage LPC blade eligible 
for installation.
    The FAA agrees and added paragraph (h) to this AD to define a part 
eligible for installation.

Request To Clarify the Use of Revised Non-Destructive Inspection 
Procedures (NDIPs)

    JAL requested clarification for the use of revised NDIPs for the 
flow path UT inspection of the 1st-stage LPC blades specified in 
paragraph (g)(1), (g)(2), and (h)(1) of the proposed AD (paragraph 
(g)(1), (g)(2), and (i)(1) of this AD). JAL commented that Pratt & 
Whitney ASB PW4G-112-A72-361, dated October 15, 2021, references the UT 
inspection procedures in NDIP 1238, NDIP-1240, and NDIP-1241, which are 
currently at the original version. JAL asked if the submission of an 
alternative method of compliance (AMOC) request is necessary if the 
NDIPs are later revised to meet the requirements in paragraph (g)(1), 
(g)(2), and (h)(1) of the proposed AD (paragraph (g)(1), (g)(2), and 
(i)(1) of this AD).
    Pratt & Whitney Alert Service Bulletin PW4G-112-A72-361, dated 
October 15, 2021, requires the latest FAA-approved revision of NDIP-
1238, NDIP-1240, and NDIP-1241 at the time the initial inspection is 
accomplished. Furthermore, the FAA has provided credit for 
accomplishment of the flow path and mid span UT inspection identified 
in paragraph (g)(1), and (i)(1) of this AD using the service 
information specified in paragraph (j) of this AD.

Support for the AD

    ALPA and Boeing expressed support for the AD as written.

Conclusion

    The FAA reviewed the relevant data, considered any comments 
received, and determined that air safety requires adopting the AD as 
proposed. Accordingly, the FAA is issuing this AD to address the unsafe 
condition on these products. Except for minor editorial changes and any 
other changes described previously, this AD is adopted as proposed in 
the NPRM. None of the changes will increase the economic burden on any 
operator.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Pratt & Whitney ASB PW4G-112-A72-361, dated 
October 15, 2021. This ASB specifies procedures for performing the TAI 
and UT inspections of 1st-stage LPC blades. 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 
ADDRESSES.

Other Related Service Information

    The FAA reviewed ``Engine-Driven Pump (EDP) Shutoff Valve Check'' 
(Subtasks 26-21-00-200-018, 26-21-00-200-019, 26-21-00-840-022, and 
Task 29-11-00-710-806) of Boeing 777-200/300 Aircraft Maintenance 
Manual, dated September 5, 2021. The service information specifies 
procedures for performing the engine-driven pump shutoff valve 
functional check.

Costs of Compliance

    The FAA estimates that this AD affects 108 engines installed on 
airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this AD:

[[Page 13925]]

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Perform UT flow path inspection of 1st- 15 work-hours x $85 per               $0          $1,275        $137,700
 stage LPC blades.                       hour = $1,275.
Perform UT mid span inspection of 1st-  30 work-hours x $85 per                0           2,550         275,400
 stage LPC blades.                       hour = $2,550.
Perform TAI inspection of 1st-stage     22 work-hours x $85 per                0           1,870         201,960
 LPC blades.                             hour = $1,870.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary 
replacement that would be required based on the results of the 
inspection. The agency has no way of determining the number of aircraft 
that might need this replacement:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                 Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace 1st-stage LPC blade...................  0 work-hours x $85 per hour = $0        $125,000        $125,000
----------------------------------------------------------------------------------------------------------------

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.
    The FAA is 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

    The FAA has determined that 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) Will not affect intrastate aviation in Alaska, and
    (3) 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 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:
0
a. Removing Airworthiness Directive (AD) 2019-03-01, Amendment 39-19553 
(84 FR 4320, February 15, 2019), and AD 2021-05-51, Amendment 39-21470 
(86 FR 13445, March 9, 2021); and
0
b. Adding the following new airworthiness directive:

2022-06-09 Pratt & Whitney Division: Amendment 39-21975; Docket No. 
FAA-2021-0959; Project Identifier AD-2021-00830-E.

(a) Effective Date

    This airworthiness directive (AD) is effective April 15, 2022.

(b) Affected ADs

    This AD replaces AD 2019-03-01, Amendment 39-19553 (84 FR 4320, 
February 15, 2019), and AD 2021-05-51, Amendment 39-21470 (86 FR 
13445, March 9, 2021).

(c) Applicability

    This AD applies to Pratt & Whitney Division (PW) PW4074, 
PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 model 
turbofan engines, with a 1st-stage low-pressure compressor (LPC) 
blade, with part number 52A241, 55A801, 55A801-001, 55A901, 55A901-
001, 56A201, 56A201-001, or 56A221, installed.

(d) Subject

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

(e) Unsafe Condition

    This AD was prompted by three in-flight failures of a 1st-stage 
LPC blade, with one failure resulting in an engine fire during 
flight, and subsequent manufacturer publication of service 
information specifying improved inspections for three critical 
locations on the 1st-stage LPC blade. The FAA is issuing this AD to 
prevent failure of the 1st-stage LPC blades. The unsafe condition, 
if not addressed, could result in 1st-stage LPC blade 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) Initial 1st-Stage LPC Blade Inspections

    (i) For 1st-stage LPC blades that have accumulated any number of 
cycles since new (CSN) greater than zero, before further flight 
after the effective date of this AD, perform a flow path and a mid 
span ultrasonic testing (UT) inspection of the 1st-stage LPC blades 
in accordance with the Accomplishment Instructions, Part A--Initial 
Inspection of All LPC Fan Blades Prior to Their Return to Service, 
paragraph 1.A. through C., of Pratt & Whitney Alert Service Bulletin 
(ASB) PW4G-112-A72-361, dated October 15, 2021 (PW4G-112-A72-361). 
New 1st-stage LPC

[[Page 13926]]

blades that have zero CSN do not need to undergo the initial 1st-
stage LPC blade flow path and mid span UT inspection required by 
paragraph (g)(1)(i) of this AD, but must undergo the repetitive 
inspections of paragraph (g)(2) of this AD.
    (ii) Within the following compliance times after the effective 
date of this AD, perform a thermal acoustic image (TAI) inspection 
of the 1st-stage LPC blades for cracks using a method approved by 
the FAA:
    (A) For 1st-stage LPC blades with 1,000 CSN or more, with no 
prior TAI inspection, inspect before further flight.
    (B) For 1st-stage LPC blades with 1,000 flight cycles (FCs) or 
more since the last TAI inspection, inspect before further flight.
    (C) For 1st-stage LPC blades with fewer than 1,000 CSN, with no 
prior TAI inspection, inspect before accumulating 1,000 CSN.
    (D) For 1st-stage LPC blades with fewer than 1,000 FCs since the 
last TAI inspection, inspect before accumulating 1,000 FCs since the 
last TAI inspection.
    Note 1 to paragraph (g)(1)(ii): The FAA-approved TAI inspection 
method and the vendors that can perform the FAA-approved TAI 
inspection are specified in the Accomplishment Instructions section 
and the Vendor Services section of PW4G-112-A72-361, respectively.

(2) Repetitive 1st-Stage LPC Blade Inspections

    (i) Before exceeding 275 FCs since the last flow path UT 
inspection, and thereafter at intervals not exceeding 275 FCs since 
the last flow path UT inspection, perform a flow path UT inspection 
of the 1st-stage LPC blades in accordance with the Accomplishment 
Instructions, Part B--Repetitive Inspection of All LPC Fan Blades 
After Their Return to Service, paragraph 1.A., of PW4G-112-A72-361.
    (ii) Before exceeding 550 FCs since the last mid span UT 
inspection, and thereafter at intervals not exceeding 550 FCs since 
the last mid span UT inspection, perform a mid span UT inspection of 
the 1st-stage LPC blades in accordance with the Accomplishment 
Instructions, Part B--Repetitive Inspection of All LPC Fan Blades 
After Their Return to Service, paragraphs 1.B. and C., of PW4G-112-
A72-361.
    (iii) Before exceeding 1,000 FCs since the last TAI inspection, 
and thereafter at intervals not exceeding 1,000 FCs since the last 
TAI inspection, perform repetitive TAI inspections of the 1st-stage 
LPC blades using a method approved by the FAA.
    Note 2 to paragraph (g)(2)(iii): The FAA-approved TAI inspection 
method and the vendors that can perform the FAA-approved TAI 
inspection are specified in the Accomplishment Instructions section 
and the Vendor Services section of PW4G-112-A72-361, respectively.

(3) Removal of the 1st-Stage LPC Blade

    If any 1st-stage LPC blade fails any inspection required by 
paragraphs (g)(1) or (2) of this AD, before further flight, remove 
the 1st-stage LPC blade from service and replace with a part 
eligible for installation.

(h) Definition

    For the purpose of this AD, a ``part eligible for installation'' 
is a new, zero CSN 1st-stage LPC blade or a 1st-stage LPC blade that 
has passed the inspections required by paragraphs (g)(1) and (2) of 
this AD, as applicable.

(i) Special Flight Permit

    Special flight permits, as described in 14 CFR 21.197 and 
21.199, are permitted provided that the actions in paragraphs (i)(1) 
and (2) of this AD have first been accomplished.
    (1) A flow path UT inspection of the 1st-stage LPC blades for 
cracking has been done within the last 275 FCs, as specified in the 
Accomplishment Instructions, Part A--Initial Inspection of All LPC 
Fan Blades Prior to their Return to Service, paragraph 1.A., of 
PW4G-112-A72-361, and the 1st-stage LPC blades have been found 
serviceable. This inspection is not required for 1st-stage LPC 
blades with 275 CSN or fewer.
    (2) A functional check of the left and right hydraulic pump 
shutoff valves to ensure they close in response to the corresponding 
engine fire handle input and all applicable corrective actions 
(i.e., repair) within 10 days prior to flight.
    Note 3 to paragraph (i)(2): Guidance for accomplishing the 
actions required by paragraph (i)(2) of this AD can be found in the 
``Engine-Driven Pump (EDP) Shutoff Valve Check'' (Subtasks 26-21-00-
200-018, 26-21-00-200-019, 26-21-00-840-022, or Task 29-11-00-710-
806) of Boeing 777-200/300 Aircraft Maintenance Manual.

(j) Credit for Previous Actions

    This paragraph provides credit for the actions specified in 
paragraphs (g)(1) and (i)(1) of this AD, if those actions were 
performed before the effective date of this AD using the service 
information specified in paragraph (j)(1), (2), or (3) of this AD.
    (1) Paragraph 2. of the Accomplishment Instructions of Pratt & 
Whitney Special Instruction No. 85F21, dated May 12, 2021, for a 
flow path UT inspection.
    (2) Paragraph 1.a) through c) of the Accomplishment Instructions 
of Pratt & Whitney Special Instruction No. 130F-21, dated July 1, 
2021, for a flow path and a mid span UT inspection.
    (3) Paragraph 2.a) through c) of the Accomplishment Instructions 
of Pratt & Whitney Special Instruction No. 130F-21, Revision A, 
dated July 28, 2021, for a flow path and a mid span UT inspection.

(k) 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 (l) 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.

(l) Related Information

    For more information about this AD, contact Carol Nguyen, 
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: (781) 238-7655; fax: (781) 238-7199; 
email: [email protected].

(m) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless the AD specifies otherwise.
    (i) Pratt & Whitney Alert Service Bulletin PW4G-112-A72-361, 
dated October 15, 2021.
    (ii) [Reserved]
    (3) For service information identified in this AD, contact Pratt 
& Whitney Division, 400 Main Street, East Hartford, CT 06118; phone: 
(860) 565-0140; email: [email protected]; website: https://connect.prattwhitney.com.
    (4) You may view this service information FAA, Airworthiness 
Products Section, Operational Safety Branch, 1200 District Avenue, 
Burlington, MA 01803. For information on the availability of this 
material at the FAA, call (817) 222-5110.
    (5) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, email: [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on March 4, 2022.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2022-05296 Filed 3-9-22; 4:15 pm]
BILLING CODE 4910-13-P