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Federal Register / Vol. 86, No. 226 / Monday, November 29, 2021 / Proposed Rules
Company, 1 Neumann Way, Cincinnati, OH 45215; phone: 513 5523272;
email: aviation.fleetsupport@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 817 222
5110.

Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.

Confidential Business Information CBI is commercial or financial You may examine the AD docket at information that is both customarily and https www.regulations.gov by actually treated as private by its owner.
searching for and locating Docket No.
Under the Freedom of Information Act FAA20211016; or in person at Docket FOIA 5 U.S.C. 552, CBI is exempt Operations between 9 a.m. and 5 p.m., from public disclosure. If your Monday through Friday, except Federal comments responsive to this NPRM
holidays. The AD docket contains this contain commercial or financial NPRM, any comments received, and information that is customarily treated other information. The street address for as private, that you actually treat as Docket Operations is listed above.
private, and that is relevant or responsive to this NPRM, it is important FOR FURTHER INFORMATION CONTACT:
that you clearly designate the submitted Scott Stevenson, Aviation Safety comments as CBI. Please mark each Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803; page of your submission containing CBI
as PROPIN. The FAA will treat such phone: 781 2387132; fax: 781 238
7199; email: Scott.M.Stevenson@faa.gov. marked submissions as confidential under the FOIA, and they will not be SUPPLEMENTARY INFORMATION:
placed in the public docket of this NPRM. Submissions containing CBI
Comments Invited should be sent to Scott Stevenson, The FAA invites you to send any Aviation Safety Engineer, ECO Branch, written relevant data, views, or FAA, 1200 District Avenue, Burlington, arguments about this proposal. Send MA 01803. Any commentary that the your comments to an address listed FAA receives which is not specifically under ADDRESSES. Include Docket No.
designated as CBI will be placed in the FAA20211016; Project Identifier AD public docket for this rulemaking.
202100625E at the beginning of your Background comments. The most helpful comments reference a specific portion of the The FAA received a report from GE of proposal, explain the reason for any a manufacturing quality escape that recommended change, and include identified a certain population of HPT
supporting data. The FAA will consider rotor stage 1 disks that did not meet the all comments received by the closing design specification. GE determined that date and may amend this proposal machining and inspection of the because of those comments.
affected HPT rotor stage 1 disks was Examining the AD Docket
inconsistent with the engineering drawing. Further analysis by GE
determined that the nonconformance at the forward and aft hooks of the HPT
rotor stage 1 disks may cause the disks to fail prematurely and, therefore, the life limit of the affected HPT rotor stage 1 disks require reduction. As a result, GE decreased the life limit of the affected HPT rotor stage 1 disks. This condition, if not addressed, could result in uncontained disk release, damage to the engine, and damage to the airplane.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information The FAA reviewed GE Service Bulletin PASSPORT20A72000116
00A930AD, Issue 002, dated July 22, 2021. This service information describes procedures for removing a certain population of HPT rotor stage 1 disks from service and provides serial numbers of the affected HPT rotor stage 1 disks.
Proposed AD Requirements in This NPRM
This proposed AD would require revising the ALS of the GE Passport 20
Line Maintenance Manual, GEK 112062, and the operators existing approved CAMP to incorporate a reduced life limit for certain HPT rotor stage 1 disks.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 78
engines installed on airplanes of U.S.
registry.
The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Action
Labor cost
Revise the ALS of the Line Maintenance Manual and the operators existing approved CAMP.

1 work-hour $85 per hour = $85 ..

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Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys authority.

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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.

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Cost per product
Parts cost $0

$85

Cost on U.S.
operators $6,630

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 determined that this proposed AD would not have federalism implications under Executive Order
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