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Federal Register / Vol. 86, No. 162 / Wednesday, August 25, 2021 / Proposed Rules
NPRM. Submissions containing CBI
should be sent to Kevin M. Clark, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

life limits of certain critical rotating parts.
The FAA also reviewed Chapter 05
20 of RR Trent 1000 TLM TTRENT
10RRT, dated August 1, 2020. RR Trent 1000 TLM TTRENT10RRT, Chapter 0520, identifies the critical rotating part inspection thresholds and intervals.

Background
FAAs Determination
EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20200243, dated November 5, 2020 EASA AD
20200243, to correct an unsafe condition on RRD Trent 1000AE3, Trent 1000CE3, Trent 1000D3, Trent 1000G3, Trent 1000H3, Trent 1000
J3, Trent 1000K3, Trent 1000L3, Trent 1000M3, Trent 1000N3, Trent 1000
P3, Trent 1000Q3, and Trent 1000R3
model turbofan engines.
This proposed AD was prompted by the manufacturer revising the engine TLM life limits of certain critical rotating parts and updating certain maintenance tasks. The FAA is proposing this AD to prevent the failure of critical rotating parts.

These engines have been approved by the aviation authority of another country and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified about the unsafe condition described in the EASA AD referenced in this proposed AD. 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 Under 1
CFR Part 51
The FAA reviewed EASA AD 2020
0243. EASA AD 20200243 specifies revising the approved AMP by incorporating the limitations, tasks, and associated thresholds and intervals described in the TLM. This material 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 Chapter 0510 of Rolls-Royce RR Trent 1000 TLM T
TRENT10RRT, dated August 1, 2020.
RR Trent 1000 TLM TTRENT10RRT, Chapter 0510, identifies the reduced
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in EASA AD 20200243, described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this proposed AD and except as discussed under Differences Between this Proposed AD and the EASA AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20200243 will be incorporated by
reference in the FAA final rule. This proposed AD would require compliance with EASA AD 20200243 in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this proposed AD. Using common terms that are the same as the heading of a particular section in EASA AD 2020
0243 does not mean that operators need comply only with that section. For example, where the AD requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in EASA AD
20200243. Service information specified in EASA AD 20200243 that is required for compliance with it will be available at https www.regulations.gov by searching for and locating Docket No.
FAA20210690 after the FAA final rule is published.
Differences Between This Proposed AD
and the EASA AD
This AD does not mandate the Maintenance Tasks and Replacement of Critical Parts and Corrective Actions sections of EASA AD 2020
0243. Where EASA AD 20200243
requires compliance from its effective date, this proposed AD would require using the effective date of this AD.
Where EASA AD 20200243 requires revising the AMP within 12 months from its effective date, this proposed AD
would require revising the existing AMP
within 90 days after the effective date of this AD. This AD does not mandate compliance with the Remarks section of EASA AD 20200243.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 4
engines installed on airplanes of U.S.
registry.
The FAA estimates the following costs to comply with this proposed AD:

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ESTIMATED COSTS
Action
Labor cost
Revise the ALS of the AMP

1 work-hour $85 per hour = $85

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
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detail the scope of the Agencys 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
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Cost per product
Parts cost $0

$85

Cost on U.S.
operators $340

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.

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