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Federal Register / Vol. 86, No. 59 / Tuesday, March 30, 2021 / Proposed Rules Agent for the Member States of the European Community, has issued EASA
AD 20210006, dated January 7, 2021
referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:
An unexpected reduction in fuel pump performance has been seen during testing of high life units. Strip examination of these fuel pumps has identified that life related wear-out of the internal components is causing deterioration in pump efficiency.
The effect of the loss of fuel pump efficiency is more pronounced on higher rated engines.
This condition, if not corrected, could lead to reduced engine thrust, possibly resulting in reduced control of the aeroplane.
To address this potential unsafe condition, Rolls-Royce published NMSB 73AK581
original issue to provide instructions for replacement of the affected parts before exceeding reduced life limits. Consequently, EASA issued AD 20200124 to require the removal from service of the affected parts.
After that EASA AD was issued, RollsRoyce issued NMSB 73AK581 Revision 1, introducing an additional fuel pump, P/N
TPS100005, as well as new and reduced life limits for the affected parts, depending on engine model rating. Consequently, EASA
issued AD 20200154, retaining the requirements of EASA AD 20200124, which was superseded, expanding the Applicability to include additional engine models ratings and requiring implementation of the new and reduced life limits.
Since that EASA AD was issued, RollsRoyce issued the NMSB, as defined in this EASA AD, introducing new and reduced life limits for the affected parts, depending on engine model rating.
For the reason described above, this EASA AD retains the requirements of EASA
AD 20200154, which is superseded, and requires implementation of the new and reduced life limits, as applicable.

You may obtain further information by examining the MCAI in the AD

docket on https www.regulations.gov by searching for and locating Docket No.
FAA20210198.
FAAs Determination This product has been approved by EASA and is approved for operation in the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified us of the unsafe condition described in the MCAI and service information. The FAA is issuing this NPRM because the Agency evaluated all the relevant information provided by EASA and determined 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 Rolls-Royce RR
Alert Non-Modification Service Bulletin TRENT 100073AK581, Revision 2, dated December 2, 2020 RR Alert NMSB. The RR Alert NMSB introduces a reduced life limit for affected fuel pumps installed on certain RRD Trent 1000 model turbofan engines. The RR
Alert NMSB also includes additional RRD Trent 1000 turbofan engine models that require implementation of the reduced life limits for affected fuel pumps. 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.
Proposed AD Requirements in This NPRM
This proposed AD would retain all the requirements of AD 20201307.

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This proposed AD would add an additional part-number fuel pump and additional RRD Trent 1000 model turbofan engines on which this fuel pump is installed to the applicability.
This proposed AD would require new and reduced life limits for certain partnumbered fuel pumps, depending on the engine model the fuel pump is installed on.
Differences Between This Proposed AD
and the MCAI or the Service Information EASA AD 20210006 identifies RRD
Trent 1000E and Trent 1000E2 model turbofan engines in the Applicability section. This AD does not include RRD
Trent 1000E and Trent 1000E2 model turbofan engines in the Applicability.
These engine models have never been produced and RR Alert NMSB TRENT
1000 73AK581, Revision 2, dated December 2, 2020, did not publish life limits for affected fuel pumps installed on these engine models.
Interim Action The FAA considers that this proposed AD would be an interim action. If final action is later identified, the FAA might consider further rulemaking.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 28
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
Parts cost
Cost per product
Cost on U.S.
operators
Replace fuel pump

3 work-hours $85 per hour = $255

$393,552

$393,807

$11,026,596

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The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this proposed AD may be covered under warranty, thereby reducing the cost impact on affected individuals.
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 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
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develop on products identified in this rulemaking action.
Regulatory Findings The FAA has determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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.

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