Federal Register - September 7, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 170 / Tuesday, September 7, 2021 / Rules and Regulations Discussion of Final Airworthiness Directive Comments The FAA received comments from two commenters. The commenters were Delta Air Lines Delta and the Air Line Pilots Association, International ALPA. The following presents the comments received on the NPRM and the FAAs response to each comment.
Request To Add a Definition for Affected IPC Blades Delta requested that the FAA add a definition of affected IPC blades to paragraph h of this AD. Delta reasoned that the part number of the affected IPC
R1 blades was established in paragraph c, Applicability, but not in the proposed rule.
The FAA disagrees with the need to add a definition of an affected IPC blade to this AD, because paragraph c, Applicability, is part of the proposed rule. The FAA clarified paragraph c, Applicability, of this AD, by adding affected IPC R1 blade.
Request To Add Clarifying Instructions for Repeat BSI
Delta requested that the FAA add language similar to paragraph g1 of this AD to paragraph g2 of this AD
to clarify the instructions for the repeat BSI requirement.
The FAA disagrees. Paragraph g2
of this AD instructs the operator to repeat the inspection required by
paragraph g1 of this AD. It is unnecessary to add additional information to paragraph g2 of this AD since the repetitive inspection required by paragraph g2 of this AD
is the same as required by paragraph g1 of this AD.
Support for the AD
The ALPA supported the AD without further comment.
Conclusion The FAA reviewed the relevant data, considered any 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 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 Rolls-Royce NonModification Service Bulletin NMSB
Trent XWB 72K633, Initial Issue, dated August 7, 2020. This service information specifies procedures for performing initial and repetitive BSIs of the Trent XWB75, XWB79, XWB
79B, and XWB84 IPC R1 blades. This service information is reasonably
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available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.
Other Related Service Information The FAA reviewed Rolls-Royce Alert NMSB Trent XWB 72AK612, Initial Issue, dated July 9, 2020; Rolls-Royce Alert NMSB Trent XWB 72AK613, Initial Issue, dated July 17, 2020; and Rolls-Royce Alert NMSB Trent XWB
72AK632, Initial Issue, dated August 7, 2020.
Rolls-Royce Alert NMSB Trent XWB
72AK612 describes procedures for performing a in-shop BSI of the Trent XWB75, XWB79, XWB79B, and XWB84 IPC R1 blades. Rolls-Royce Alert NMSB Trent XWB 72AK613
describes procedures for performing an on-wing BSI of the 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.
Costs of Compliance The FAA estimates that this AD
affects 15 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this 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 mandated 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
Replacement of IPC blades
100 work-hours $85 per hour = $8,500
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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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Parts cost
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
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$187,408
Cost per product $195,908
develop on products identified in this rulemaking action.
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
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