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Rules and Regulations
Federal Register Vol. 86, No. 137
Wednesday, July 21, 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. FAA20210102; Project Identifier AD202001270E; Amendment 3921621; AD 20211316
RIN 2120AA64

Airworthiness Directives; General Electric Company Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain General Electric Company GE GEnx 2B67, GEnx2B67/P, and GEnx2B67B
model turbofan engines. This AD was prompted by a report of a crack in the lower fuel manifold causing fuel leakage. This AD requires an ultrasonic inspection USI or a fluorescent penetrant inspection FPI of the lower fuel manifold. Depending on the results of the USI or FPI, this AD requires replacement of the lower fuel manifold with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 25, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of August 25, 2021.
ADDRESSES: For service information identified in this final rule, contact General Electric Company, 1 Neumann Way, Cincinnati, OH 45215; phone:
513 5523272; email:
aviation.fleetsupport@ae.ge.com;
website: www.ge.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 781 238

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SUMMARY:

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7759. It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0102.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210102; 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, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Alexei Marqueen, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387178; fax: 781 238
7199; email: Alexei.T.Marqueen@
faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain GE GEnx2B67, GEnx 2B67/P, and GEnx2B67B model turbofan engines. The NPRM published in the Federal Register on February 26, 2021 86 FR 11670. The NPRM was prompted by a report that a GEnx2B
model turbofan engine installed on a Boeing Model 7478 airplane was removed from service due to confirmed fuel leakage from a lower fuel manifold in May 2019. The operator observed fuel leakage during a routine borescope inspection of the high-pressure turbine and later confirmed, by ultrasonic inspection, a crack at brazed block 4 in the pilot secondary fuel circuit tube on the lower fuel manifold. The FAA
received two similar reports, in March 2020 and May 2020, of a fuel leak from the lower fuel manifold at brazed block 4. The manufacturer has identified the root cause of this cracking as low-cycle fatigue due to the abrupt transition created by the brazed support block pad and its inability to slide due to thermal loads as intended. In the NPRM, the FAA proposed to require an USI or an FPI of the lower fuel manifold.
Depending on the results of the USI or
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FPI, the NPRM proposed to require replacement of the lower fuel manifold with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive Comments The FAA received comments from five commenters. The commenters were Air Line Pilots Association, International ALPA; Boeing Commercial Airplanes Boeing; Cathay Pacific Airways Limited Cathay; GE;
and United Parcel Service UPS. The following presents the comments received on the NPRM and the FAAs response to each comment.
Request for Confirmation That Alternate Ultrasonic Probes Are Approved UPS requested confirmation of whether the alternate probes listed in AppendixA, paragraph 4.1.1. of GE
GEnx2B Service Bulletin SB 730089
R01, dated January 11, 2021 SB 73
0089 R01, are approved alternate ultrasonic probes to inspect the lower fuel manifold. UPS reasoned that AppendixA, paragraph 4.1.1. of SB
730089 R01 indicates that ultrasonic probes part number P/N 00010012
and P/N 00010013 are approved alternates for ultrasonic probes P/N
389085151 and P/N 389085161, respectively. However, the inspection procedure, figures, and record log in SB
730089 R01 only list ultrasonic probe P/N 389085151 and P/N 389085
161.
The FAA confirms that alternate ultrasonic probes, P/N 00010012 and P/N 00010013, are approved alternates, and this AD does not prohibit their use.
Request for Allowance of Alternative Probe Application Tool UPS requested that the FAA allow alternative, locally manufactured probe application tools to aid in the installation of the ultrasonic probes on the lower fuel manifold. UPS reasoned that during the installation of the ultrasonic probes on the lower fuel manifold using probe application tool P/N SGP156, which is included with the GE Aircraft Engines Inspection Kit P/N GEFQAP677, maintenance noted that in certain locations, modifying the GE probe application tool provides
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