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Federal Register / Vol. 86, No. 102 / Friday, May 28, 2021 / Proposed Rules
Trent XWB75, XWB79, XWB79B, and XWB84 IPC R1 blades. Rolls-Royce Alert NMSB Trent XWB 72AK632
defines the initial inspection threshold and repeat inspection intervals for Trent XWB75, XWB79, XWB79B, and XWB84 IPC R1 blades.
Proposed AD Requirements in This NPRM
This proposed AD would require initial and repetitive BSIs of the affected IPC R1 blades and, depending on the
results of the inspections, replacement of all 34 IPC R1 blades with parts eligible for installation.
Differences Between This Proposed AD
and the MCAI or Service Information EASA AD 20200277, dated December 11, 2020, and Rolls-Royce NMSB Trent XWB 72K633, Initial Issue, dated August 7, 2020, instruct operators to contact and provide information to Rolls-Royce if any IPC R1
blade is found cracked during the
inspection, while this proposed AD
requires operators to remove and replace all 34 IPC R1 blades if a crack is found during the inspection.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 15
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
BSI affected IPC R1 blades

6 work-hours $85 per hour = $510

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

$510

Cost on U.S.
operators $7,650

number of aircraft that might need this replacement.

ON-CONDITION COSTS
Action
Labor cost
Replace all 34 IPC R1 blades

100 work-hours $85 per hour = $8,500

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 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
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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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
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.
Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

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$187,408

Cost per product $195,908

Rolls-Royce Deutschland Ltd & Co KG Type Certificate previously held by RollsRoyce plc: Docket No. FAA20210381;
Project Identifier MCAI202001656E.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by July 12, 2021.
b Affected ADs None.
c Applicability This AD applies to Rolls-Royce Deutschland Ltd & Co KG Type Certificate previously held by Rolls-Royce plc Trent XWB75, Trent XWB79, Trent XWB79B, and Trent XWB84 model turbofan engines with an installed intermediate-pressure compressor IPC rotor 1 R1 blade, part number P/N KH21559.
d Subject Joint Aircraft System Component JASC
Code 7230, Turbine Engine Compressor Section.
e Unsafe Condition

39.13

Parts cost
This AD was prompted by reports of cracks in the IPC R1 blades installed on certain Trent XWB model turbofan engines. The FAA is issuing this AD to prevent failure of the IPC R1 blades. The unsafe condition, if not addressed, could result in failure of the engine, in-flight shutdown of the engine, and loss of the airplane.

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