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Federal Register / Vol. 86, No. 130 / Monday, July 12, 2021 / Rules and Regulations April 1, 2020, of the Rolls-Royce Trent XWB TLM TRENTXWBK0680TIME0
01. These two sections of the TLM
specify inspection intervals, differentiated by engine model, for critical rotating parts.

Costs of Compliance The FAA estimates that this AD
affects 22 engines installed on airplanes of U.S. registry.

36489

The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Revise the ALS of the RR Trent XWB TLM
and the operators existing approved 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 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.
Regulatory Findings
$0

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.

c Applicability
List of Subjects in 14 CFR Part 39

d Subject
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:
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

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,
Cost per product
Parts cost
Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211501 Rolls-Royce Deutschland Ltd &
Co KG Type Certificate previously held by Rolls-Royce plc: Amendment 39
21648; Docket No. FAA20210022;
Project Identifier MCAI202000395E.
a Effective Date This airworthiness directive AD is effective August 16, 2021.
b Affected ADs
khammond on DSKJM1Z7X2PROD with RULES

16:15 Jul 09, 2021

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$1,870

This AD applies to Rolls-Royce Deutschland Ltd & Co KG RRD Type Certificate previously held by Rolls-Royce plc Trent XWB75, Trent XWB79, Trent XWB79B, Trent XWB84, and Trent XWB
97 model turbofan engines.
Joint Aircraft System Component JASC
Code 7200, Engine Turbine/Turboprop.
e Unsafe Condition This AD was prompted by the manufacturer revising the time limits manual TLM to incorporate repairs to the lowpressure compressor LPC blades and introduce a new fan blade inspection. The FAA is issuing this AD to prevent the failure of critical rotating parts. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions Within 120 days after the effective date of this AD, revise the Rolls-Royce RR Trent XWB TLM, as applicable to each engine model, and the operators existing approved aircraft maintenance program AMP by incorporating the following:
1 For Trent XWB75, Trent XWB79, Trent XWB79B, and Trent XWB84 model turbofan engines, add Figure 1 to paragraph g1 of this AD to the airworthiness limitations section ALS of RR Trent XWB
TLM TRENTXWBK0680TIME001 and to the operators existing approved AMP.

None.

VerDate Sep<11>2014

$85

Cost on U.S.
operators
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