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Federal Register / Vol. 86, No. 142 / Wednesday, July 28, 2021 / Rules and Regulations ESTIMATED COSTS
Action
Labor cost
Visually inspect, strip the knife edge coating, and FPI the HPT 2nd-stage air seal assembly.

10 work-hours $85 per hour = $850.

The FAA estimates the following costs to do any necessary replacements.
The FAA has no way of determining how many replacements of the HPT
2nd-stage air seal assembly will be done
Cost per product
Parts cost
with a modified HPT 2nd-stage air seal assembly and how many will be done with a new HPT 2nd-stage air seal assembly. The FAA also has no way of determining the number of engines that
$0

$850

Cost on U.S.
operators $378,250

might need replacement of the HPT
2nd-stage air seal assembly, HPT 1ststage disk, and HPT 2nd-stage hub.

ON-CONDITION COSTS
Action
Labor cost
Replace the HPT 2nd-stage air seal assembly with modified HPT 2ndstage air seal assembly.
Replace the HPT 2nd-stage air seal assembly with new seal assembly
10 work-hours $85 per hour =
$850.
0.25 work-hours $85 per hour =
$21.25.
0.25 work-hours $85 per hour =
$21.25.

Replace the HPT 2nd-stage air seal assembly, HPT 1st-stage disk, and HPT 2nd-stage hub based on FPI results.

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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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, 2 Will not affect intrastate aviation in Alaska, and
16:30 Jul 27, 2021

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

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Jkt 253001

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

20211413 Pratt & Whitney: Amendment 3921640; Docket No. FAA20200442;
Project Identifier AD202000260E.
a Effective Date This airworthiness directive AD is effective September 1, 2021.
b Affected ADs None.
c Applicability This AD applies to all Pratt & Whitney PW PW2037, PW2037M, PW2040, and F117PW100 model turbofan engines.

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Fmt 4700

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Cost per product
$5,000

$5,850

355,000

355,021.25

970,000

970,021.25

d Subject Joint Aircraft System Component JASC
Code 7250, Turbine Section.
e Unsafe Condition This AD was prompted by a report of an uncontained engine failure resulting from cracks originating in the knife edge of the high-pressure turbine HPT 2nd-stage air seal assembly. The FAA is issuing this AD to prevent failure of the HPT 2nd-stage air seal assembly. The unsafe condition, if not addressed, could result in uncontained HPT
2nd-stage air seal assembly release, 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
1. The authority citation for part 39
continues to read as follows:

Regulatory Findings
VerDate Sep<11>2014

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.

Parts cost
1 Visual Inspection and Fluorescent Penetrant Inspection FPI of HPT 2nd-Stage Air Seal Assembly After the effective date of this AD, at every piece-part opportunity of the HPT 1st-stage disk, HPT 2nd-stage hub, or the HPT 2ndstage air seal assembly:
i Perform a visual inspection of the HPT
2nd-stage air seal assembly, strip the knife edge coating from the HPT 2nd-stage air seal assembly, and then perform an FPI of the HPT 2nd-stage air seal assembly.
Note 1 to paragraph g1i: Guidance on striping the knife edge coating from the HPT
2nd-stage air seal assembly required by paragraph g1i of this AD can be found Chapter 725260, Repair-01, of the PW2000
Series Engine Manual.
ii If a crack is found in the HPT 2nd-stage air seal assembly during the visual inspection or FPI required by paragraph g1i of this AD, remove the HPT 2nd-stage air seal assembly from service and replace it with a part eligible for installation.

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