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Federal Register / Vol. 86, No. 193 / Friday, October 8, 2021 / Proposed Rules
Proposed AD Requirements in This NPRM
This proposed AD would require removing a certain HPT rotor stage 1
disk from service and replacing the HPT
rotor stage 1 disk with a part eligible for installation.
Differences Between This Proposed AD
and the Service Information The ASBs instruct operators to perform a visual inspection of the HPT

rotor stage 1 disk and re-mark the HPT
rotor stage 1 disk, while this proposed AD would not mandate visual inspection or re-marking. The ASBs also instruct operators to perform an inspection of the removed HPT rotor stage 1 disk and send it to an authorized service center for repair, while this proposed AD would require removal of the HPT rotor stage 1 disk from service and replacement with a part eligible for installation.

Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 23
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
Remove and replace HPT rotor stage 1 disk
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
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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
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16:42 Oct 07, 2021

Jkt 256001

Parts cost
812 work-hours $85 per hour = $69,020

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.
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

$258,100

39.13

Fmt 4702

Sfmt 4702

$7,523,760

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

General Electric Company: Docket No. FAA
20210869; Project Identifier AD2021
00176E.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 22, 2021.
b Affected ADs None.
c Applicability This AD applies to General Electric Company GE CF348C5, CF348C5B1, CF348E2, CF348E2A1, CF348E5, CF34
8E5A1, CF348E5A2, CF348E6, and CF34
8E6A1 model turbofan engines with an installed high-pressure turbine HPT rotor stage 1 disk, part number P/N 4125T22P04, and a serial number S/N listed in Figure 1
or Figure 2 to paragraph c of this AD.
BILLING CODE 491013P

1. The authority citation for part 39
continues to read as follows:

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$327,120

Cost on U.S.
operators
Authority: 49 U.S.C. 106g, 40113, 44701.

PO 00000

Cost per product
E:FRFM08OCP1.SGM

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