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Federal Register / Vol. 86, No. 171 / Wednesday, September 8, 2021 / Rules and Regulations depending on the engine model the fuel pump is installed on. The FAA is issuing this AD to address the unsafe condition on these products.
The European Union Aviation Safety Agency EASA, which is the Technical 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:

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AD 20200154, which is superseded, and requires implementation of the new and reduced life limits, as applicable.

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issued AD 20200154, retaining the requirements of EASA AD 20200124, which was superseded, expanding the Applicability to include additional engine models ratings and requiring implementation of the new and reduced life limits.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
Discussion of Final Airworthiness Directive
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.

Comments The FAA received comments from two commenters. The commenters were The Boeing Company Boeing and Rolls-Royce. The following presents the comments received on the NPRM and the FAAs response to each comment.
Request To Update Service Bulletin Boeing and Rolls-Royce requested that the FAA update the specified service information by referencing Revision 3 of Rolls-Royce RR Alert NonModification Service Bulletin NMSB
TRENT 100073AK581.
The FAA agrees and has updated this AD to reference RR Alert NMSB TRENT
100073AK581, Revision 3, dated April 7, 2021. This change to this AD
imposes no additional burden on operators.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.

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Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes and any other changes described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed RR Alert NMSB
TRENT 100073AK581, Revision 3, dated April 7, 2021 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.
Interim Action The FAA considers this AD interim action. If final action is later identified, the FAA might consider further rulemaking.
Costs of Compliance The FAA estimates that this AD
affects 28 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this 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

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals.

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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.
The FAA is issuing this rulemaking under the authority described in
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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 develop on products identified in this rulemaking action.
Regulatory Findings The FAA has determined that this AD
will not have federalism implications under Executive Order 13132. This AD

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will 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.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

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