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Federal Register / Vol. 86, No. 56 / Thursday, March 25, 2021 / Rules and Regulations described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.

performing a local FPI of the M-flange if you are unable to confirm if an indication is a crack.
Support for the AD
ALPA expressed support for the AD
as written.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting the 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
Related Service Information Under 1
CFR Part 51
The FAA reviewed International Aero Engines NMASB V2500ENG72
A0706, Revision 2, dated November 7, 2019. The NMASB describes procedures for inspecting the M-flange. 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.

15793

Other Related Service Information The FAA reviewed International Aero Engines SB V2500ENG720709, Revision 1, dated February 20, 2020.
The SB identifies the diffuser case assembly P/Ns and describes procedures for replacing the diffuser case M-flange.
Costs of Compliance The FAA estimates that this AD
affects 1,654 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 of M-flange
Replace the diffuser case M-flange

2 work-hours $85 per hour = $170
40 work-hours $85 per hour = $3,400

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.
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 the States, or on the distribution of power and responsibilities among the various levels of government.

VerDate Sep<11>2014

16:53 Mar 24, 2021

Jkt 253001

Parts cost
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.
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, 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
Cost per product
$0
20,000

$170
23,400

Cost on U.S.
operators $281,180
38,703,600

a Effective Date This airworthiness directive AD is effective April 29, 2021.
b Affected ADs This AD replaces AD 20190606, Amendment 3919604 84 FR 11642, March 28, 2019.
c Applicability This AD applies to all International Aero Engines AG IAE V2500A1, V2522A5, V2524A5, V2525D5, V2527A5, V2527E
A5, V2527MA5, V2528D5, V2530A5, V2531E5, and V2533A5 model turbofan engines.
d Subject Joint Aircraft System Component JASC
Code 7250, Turbine Section.
e Unsafe Condition This AD was prompted by a crack found at the diffuser case M-flange during overhaul inspection. The FAA is issuing this AD to prevent failure of the diffuser case. The unsafe condition, if not addressed, could result in uncontained diffuser case rupture, damage to the engine, and damage to the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.

g Required Actions
20210518 International Aero Engines AG: Amendment 3921461; Docket No.
FAA20200700; Project Identifier AD
202000238E.

1 Borescope Inspection of M-Flange For engines with a diffuser case assembly, part number 2A0051, 2A208101, 2A2581
01, 2A288301, 2A288501, 2A288901, 2A289101, 2A289601, 2A289701, or 2A3132 installed, perform an initial borescope inspection BSI of zones 1, 2, and 3 of the M-flange as follows:
i For engines with a diffuser case Mflange that has 19,000 or more cycles since
2. The FAA amends 39.13 by:
a. Removing airworthiness directive 20190606, Amendment 3919604 84
FR 11642, March 28, 2019; and b. Adding the following new airworthiness directive:

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