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Federal Register / Vol. 86, No. 128 / Thursday, July 8, 2021 / Rules and Regulations parts, requires identification of the affected parts and removal from service of each affected engine for replacement of the affected part. This EASA AD also prohibits reinstallation of affected parts.

You may obtain further information by examining the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201174.
Discussion of Final Airworthiness Directive Comments The FAA received comments from two commenters. The commenters were the Air Line Pilots Association, International ALPA and an anonymous commenter. ALPA supported the NPRM
without change. The anonymous commenter supported the NPRM but stated their opinion on the estimated costs.

Request for Rolls-Royce To Share Replacement Part Cost An anonymous commenter indicated that Rolls-Royce could share the cost of new HPT disks since it was their manufacturing process that caused the defects in the HPT disks.
The FAA does not determine who pays for the costs of an AD. The Estimated Costs paragraph indicates that, according to the manufacturer, all of the costs of this AD may be covered under a manufacturer warranty, thereby reducing the cost impact on affected operators.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.

Related Service Information Under 1
CFR Part 51
The FAA reviewed Rolls-Royce Alert Non-Modification Service Bulletin NMSB SBBR70072A900659, Revision 1, dated November 5, 2019 the NMSB. The Alert NMSB provides the part numbers and serial numbers for affected HPT disks, the serial numbers for all engines with an affected HPT
disk installed, and instructions for replacement of the affected HPT disk.
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.
Costs of Compliance The FAA estimates that this AD
affects 21 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Replace HPT disk

20 work-hours $85 per hour = $1,700

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

lotter on DSK11XQN23PROD with RULES1

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 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.

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Parts cost
Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD 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 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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

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$550,000

Cost per product
Cost on U.S.
operators
$551,700

$11,585,700

PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211207 Rolls-Royce Deutschland Ltd &
Co KG Type Certificate previously held by Rolls-Royce Deutschland GmbH, formerly BMW Rolls-Royce GmbH:
Amendment 3921594; Docket No.
FAA20201174; Project Identifier MCAI201900135E.
a Effective Date This AD is effective August 12, 2021.
b Affected ADs None.
c Applicability This AD applies to Rolls-Royce Deutschland Ltd & Co KG RRD Type Certificate previously held by Rolls-Royce Deutschland GmbH, formerly BMW RollsRoyce GmbH BR700710A110, BR700
710A220 and BR700710C411 model turbofan engines with a high-pressure turbine HPT stage 1 disk having a part number and serial number listed in Planning Information, paragraph 1.A., of Rolls-Royce Alert Non-

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