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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Rules and Regulations
aircraft that might need this replacement:

ON-CONDITION COSTS
Action
Labor cost
Replace the HPT 1st-stage disk or HPT 2nd-stage disk.

0 work-hours $85 per hour = $0

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.
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.

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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 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, and 2 Will not affect intrastate aviation in Alaska.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Amendment Accordingly, under the authority delegated to me by the Administrator,
VerDate Sep<11>2014

15:58 Jul 20, 2021

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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

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

20211419 International Aero Engines AG: Amendment 3921646; Docket No.
FAA20210544; Project Identifier AD
202100642E.
a Effective Date This airworthiness directive AD is effective August 5, 2021.
b Affected ADs None.
c Applicability This AD applies to International Aero Engines AG IAE V2522A5, V2524A5, V2525D5, V2527A5, V2527EA5, V2527MA5, V2528D5, V2530A5, V2531
E5, and V2533A5 model turbofan engines with an installed:
1 High-pressure turbine HPT 1st-stage disk, part number P/N 2A5001, with a serial number S/N listed in Accomplishment Instructions, Table 1, of Pratt & Whitney P&W Special Instruction SI No. 112F21, dated May 24, 2021 P&W SI No. 112F21;
or 2 HPT 2nd-stage disk, P/N 2A4802, with an S/N listed in Accomplishment Instructions, Table 2, of P&W SI No. 112F
21, or S/N listed in Accomplishment Instructions, Table 1, P&W SI No. 114F21, dated May 24, 2021 P&W SI No. 114F21.
d Subject Joint Aircraft System Component JASC
Code 7250, Turbine Section.
e Unsafe Condition This AD was prompted by a review of investigative findings from an event involving an uncontained failure of a HPT
1st-stage disk that resulted in high-energy debris penetrating the engine cowling. The FAA is issuing this AD to prevent failure of the HPT 1st-stage disk and HPT 2nd-stage disk. The unsafe condition, if not addressed, could result in uncontained HPT disk failure, damage to the engine, damage to the airplane, and loss of the airplane.

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Parts cost $300,000

Cost per product $300,000

f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 For an HPT 1st-stage disk, P/N 2A5001, with an S/N listed in Accomplishment Instructions, Table 1, of P&W SI No. 112F
21, that has been installed at any time in an IAE V2527EA5, V2527MA5, V2528D5, V2530A5, or V2533A5 model turbofan engine during operation, within 100 flight cycles FCs after the effective date of this AD, perform an ultrasonic inspection USI of the HPT 1st-stage disk using the Accomplishment Instructions, paragraph 6, of IAE NMSB V2500ENG720713, Revision 1.
2 For an HPT 1st-stage disk, P/N 2A5001, with an S/N listed in Accomplishment Instructions, Table 1, of P&W SI No. 112F
21, that has only been installed in an IAE
V2522A5, V2524A5, V2525D5, or V2527
A5 model turbofan engine during operation, within 220 FCs after the effective date of this AD, perform a USI of the HPT 1st-stage disk using the Accomplishment Instructions, paragraph 6, of IAE NMSB V2500ENG72
0713, Revision 1.
3 For an HPT 2nd-stage disk, P/N
2A4802, with an S/N listed in Accomplishment Instructions, Table 2, of P&W SI No. 112F21, that has been installed at any time in an IAE V2527EA5, V2527M
A5, V2528D5, V2530A5, or V2533A5
model turbofan engine during operation, within 385 FCs after the effective date of this AD, perform a USI of the HPT 2nd-stage disk using the Accomplishment Instructions, paragraph 7, of IAE NMSB V2500ENG72
0713, Revision 1.
4 For an HPT 2nd-stage disk, P/N
2A4802, with an S/N listed in Accomplishment Instructions, Table 2, of P&W SI No. 112F21, that has only been installed in an IAE V2522A5, V2524A5, V2525D5, or V2527A5 model turbofan engine during operation, within 620 FCs after the effective date of this AD, perform a USI
of the HPT 2nd-stage disk using the Accomplishment Instructions, paragraph 7, of IAE NMSB V2500ENG720713, Revision 1.
5 For an HPT 2nd-stage disk, P/N
2A4802, with an S/N listed in Accomplishment Instructions, Table 1, of P&W SI No. 114F21, that has only been installed in an IAE V2531E5 model turbofan engine during operation, within 385 FCs after the effective date of this AD, perform a USI
of the HPT 2nd-stage disk using the Accomplishment Instructions, paragraph 7, of IAE NMSB V2500E5720015.

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