Federal Register - September 16, 2021
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Fuente: Federal Register
51602
Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations
Related Service Information Under 1
CFR Part 51
The FAA reviewed Rolls-Royce Alert Non-Modification Service Bulletin NMSB Trent 1000 72AK313, Revision 1, dated August 22, 2019; and RollsRoyce Alert Service Bulletin SB Trent 1000 72AK430, Initial Issue, dated August 17, 2020. Rolls-Royce Alert NMSB Trent 1000 72AK313 defines the initial inspection threshold and repeat inspection intervals for Trent 1000 IPC stage 1 rotor blade, IPC stage 2 rotor blade, and IPC shaft stage 2
dovetail posts. Rolls-Royce Alert SB
Trent 1000 72AK430 introduces the IPC stage 1 and stage 2 rotor blades in kitted sets and provides kitting instructions. 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.
Other Related Service Information The FAA reviewed Rolls-Royce Alert NMSB Trent 1000 72AJ814, Revision 5, dated May 3, 2019; Rolls-Royce Alert NMSB Trent 1000 72AJ819, Revision 4, dated May 3, 2019; Rolls-Royce Alert NMSB Trent 1000 72AK092, Revision 4, dated May 3, 2019; Rolls-Royce SB
Trent 1000 72J871, Revision 6, dated December 12, 2019; and Rolls-Royce SB
Trent 1000 72J941, Revision 1, dated February 6, 2019.
Rolls-Royce Alert NMSB Trent 1000
72AJ814 describes procedures for performing an ultrasonic inspection USI of the IPC stage 1 rotor blades.
Rolls-Royce Alert NMSB Trent 1000 72
AJ819 describes procedures for performing a visual borescope inspection of the IPC stage 2 rotor blades and IPC shaft stage 2 dovetail posts. Rolls-Royce Alert NMSB Trent 1000 72AK092 describes procedures for performing a USI of the IPC stage 2
rotor blades. Rolls-Royce SB Trent 1000
72J871 describes procedures for reworking or replacing the affected parts. Rolls-Royce SB Trent 1000 72
J941 specifies procedures for installing the redesigned IPC stage 1 and stage 2
rotor blades.
Costs of Compliance The FAA estimates that this AD
affects 7 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
ESTIMATED COSTS
Cost per product
Labor cost
Inspect the IPC stage 1 rotor blade root Front Face.
Inspect the IPC stage 2 rotor blade root Front Face and IPC shaft stage 2 dovetail post Front Face.
Inspect the IPC stage 2 rotor blade root Rear Face.
Replace all 34 IPC stage 1 rotor blades mandatory terminating action.
Replace all 49 IPC stage 2 rotor blades mandatory terminating action.
20 work-hours $85 per hour = $1,700
$0
$1,700
$11,900
6 work-hours $85 per hour = $510
0
510
3,570
10 work-hours $85 per hour = $850
0
850
5,950
280 work-hours $85 per hour = $23,800
52,360
76,160
533,120
280 work-hours $85 per hour = $23,800
48,755
72,555
507,885
The FAA estimates the following costs to do any necessary replacements that would be required based on the
Parts cost
Cost on U.S.
operators
Action
results of the inspection. The agency has no way of determining the number of
aircraft that might need these replacements:
ON-CONDITION COSTS
Action
Labor cost
Replace all 34 IPC stage 1 rotor blades
Replace all 49 IPC stage 2 rotor blades
Replace the IPC drum assembly
280 work-hours $85 per hour = $23,800
280 work-hours $85 per hour = $23,800
144 work-hours $85 per hour = $12,240
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
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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 has determined that 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
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Fmt 4700
Sfmt 4700
Parts cost $52,360
48,755
1,370,000
Cost per product $76,160
72,555
1,382,240
the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that 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.
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