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Rules and Regulations
Federal Register Vol. 86, No. 128
Thursday, July 8, 2021

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.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210191; Project Identifier AD202001492E; Amendment 3921633; AD 20211406
RIN 2120AA64

Airworthiness Directives; Pratt &
Whitney Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is superseding Airworthiness Directive AD 201921
11 and AD 20200702. AD 20192111
applied to all Pratt & Whitney PW
PW1519G, PW1521G, PW1521G3, PW1521GA, PW1524G, PW1524G3, PW1525G, PW1525G3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923GA model turbofan engines.
AD 20200702 applied to all PW
PW1519G, PW1521G, PW1521G3, PW1521GA, PW1524G, PW1524G3, PW1525G, and PW1525G3 model turbofan engines. AD 20192111
required initial and repetitive borescope inspections BSIs of the low-pressure compressor LPC rotor 1 R1 and, depending on the results of the inspections, replacement of the LPC. AD
20200702 required the removal from service of certain electronic engine control EEC full authority digital electronic control FADEC software and the installation of a software version eligible for installation. This AD
continues to require repetitive BSIs of certain LPC R1s until replacement of EEC FADEC software with the updated software. This AD also requires a BSI
after installation of the updated EEC
FADEC software if certain Onboard Maintenance Message fault codes are displayed and meet specified criteria.
The FAA is issuing this AD to address the unsafe condition on these products.

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SUMMARY:

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DATES:

This AD is effective August 12,
2021.
For service information identified in this final rule, contact Pratt & Whitney, 400 Main Street, East Hartford, CT 06118; phone: 800 565
0140; email: help24@pw.utc.com;
website: http fleetcare.pw.utc.com.
You may view this service information at the Airworthiness Products Section, FAA, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call 781 2387759. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210191.

ADDRESSES:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210191; 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 W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387116; fax: 781 238
7199; email: nicholas.j.paine@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20192111, Amendment 3919777 84 FR 57813, October 29, 2019, AD 20192111 and AD 20200702, Amendment 3921106
85 FR 17742, March 31, 2020, AD
20200702. AD 20192111 applied to certain PW PW1519G, PW1521G, PW1521GA, PW1524G, PW1525G, PW1521G3, PW1524G3, PW1525G3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923GA model turbofan engines. AD 20200702
applied to all PW PW1519G, PW1521G, PW1521G3, PW1521GA, PW1524G, PW1524G33, PW1525G, and PW1525G33 model turbofan engines.
The NPRM published in the Federal Register on March 26, 2021 86 FR

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16137. The NPRM was prompted by reports of in-flight shutdowns due to failure of the LPC R1 and by subsequent findings of cracked LPC R1s during inspection. Additionally, the manufacturer performed further root cause analysis of the LPC R1 failures and determined the need to update the EEC FADEC software to automate rotor speed management and limit the maximum climb and maximum continuous thrust ratings. In the NPRM, the FAA proposed to retain certain requirements of AD 20192111 and none of the requirements of AD 2020
0702. In the NPRM, the FAA proposed to continue to require a BSI of certain LPC R1s for damage and cracks and, depending on the results of the BSI, replacement of the LPC R1. In the NPRM, the FAA proposed to continue to require repetitive BSIs of certain LPC
R1s until replacement of the EEC
FADEC software with the updated software. In the NPRM, the FAA also proposed to require a BSI of the LPC R1
after installation of the updated EEC
FADEC software if certain Onboard Maintenance Message fault codes are displayed and meet specified criteria.
Discussion of Final Airworthiness Directive Comments The FAA received comments from two commenters. The commenters were Air Line Pilots Association, International ALPA and Delta Air Lines, Inc. DAL. ALPA supported the proposal without change. DAL
supported the proposal but recommended certain changes. The following presents the comments received on the NPRM and the FAAs response to each comment.
Request To Correct the Effective Date of AD 20191911
DAL requested that the FAA correct the reference to the effective date of AD
20191911, in paragraph g1i of this AD from October 29, 2019, to September 26, 2019 the effective date of AD 20191911.
The FAA agrees and has revised paragraph g1i of this AD as requested. This change adds no additional burden on any operator who is required to comply with this AD.

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