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Federal Register / Vol. 86, No. 218 / Tuesday, November 16, 2021 / Proposed Rules
63321

ESTIMATED COSTS
Action
Labor cost
Perform ultrasonic inspection
Rework the LPC front case assembly

8 work-hours $85 per hour = $680
200 work-hours $85 per hour = $17,000

The FAA estimates the following costs to do any necessary replacements that would be required based on the
Parts cost
results of the proposed inspection. The FAA has no way of determining the
$0
18,724

Cost per product $680
35,724

Cost on U.S.
operators $66,640
3,500,952

number of aircraft that might need these replacements:

ON-CONDITION COSTS
Action
Labor cost
Replace the LPC front case assembly

140 work-hours $85 per hour = $11,900

Authority for This Rulemaking
List of Subjects in 14 CFR Part 39

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.

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

lotter on DSK11XQN23PROD with PROPOSALS1

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

VerDate Sep<11>2014

16:54 Nov 15, 2021

Jkt 256001

The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
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:

Rolls-Royce Deutschland Ltd & Co KG Type Certificate previously held by RollsRoyce plc: Docket No. FAA20211004;
Project Identifier MCAI202100480E.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by January 3, 2022.
b Affected ADs None.
c Applicability This AD applies to Rolls-Royce Deutschland Ltd & Co KG RRD Type Certificate previously held by Rolls-Royce plc RB211 Trent 87517, RB211 Trent 877
17, RB211 Trent 88417, RB211 Trent 884B
17, RB211 Trent 89217, RB211 Trent 892B
17, and RB211 Trent 89517 model turbofan engines, as identified in EASA AD 2021
0114, dated April 23, 2021 EASA AD 2021
0114.
d Subject Joint Aircraft System Component JASC
Code 7230, Turbine Engine Compressor Section.

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Parts cost $932,000

Cost per product $943,900

e Unsafe Condition This AD was prompted by findings during engine overhaul of corrosion on the lowpressure compressor LPC front case assembly caused by excessive movement between the Kevlar wrap and the fan case, which resulted in the anti-corrosion paint fretting away. The FAA is issuing this AD to address corrosion on the LPC front case assembly. The unsafe condition, if not addressed, could result in reduced integrity of the LPC front case assembly during a fan blade release, resulting in damage to the airplane or reduced control of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions Except as specified in paragraph h of this AD: Perform all required actions within the compliance times specified in, and in accordance with, EASA AD 20210114.
h Exceptions to EASA AD 20210114
1 Where EASA AD 20210114 requires compliance from its effective date, this proposed AD would require using the effective date of this AD.
2 Where EASA AD 20210114 defines a qualified shop visit as any scheduled shop visit where the affected part is exposed and substantial rebuild has not yet started, this AD defines a qualified shop visit as the induction of an engine into the shop after the effective date of this AD for maintenance involving the separation of pairs of major mating engine flanges, with the exception of the separation of engine flanges solely for the purposes of transportation of the engine without subsequent engine maintenance, which does not constitute an engine shop visit.
3 Where the service information referred to in EASA AD 20210114 specifies to contact the manufacturer for repair instructions if any corrosion is found exceeding the criteria as specified in the NMSB, this AD requires the removal of the affected LPC front case assembly from service if corrosion is found that exceeds the criteria specified in Appendix 2 of the NMSB.

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