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Federal Register / Vol. 86, No. 142 / Wednesday, July 28, 2021 / Rules and Regulations iii During the visual inspection or FPI
required by paragraph g1i of this AD, if a crack is found in the shaded regions of the HPT 2nd-stage air seal assembly identified in Figure 1 to paragraph g1iii of this AD
Figure 1, which extends towards the knife-

edge region of the HPT 2nd-stage air seal assembly, remove the HPT 2nd-stage air seal assembly, mating HPT 1st-stage disk, and HPT 2nd-stage hub from service, and replace the parts with parts eligible for installation.
In order to return the mating HPT 1st-stage
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disk and HPT 2nd-stage hub to service, the inspections of the HPT 2nd-stage air seal assembly cannot reveal a crack identified in the shaded regions of Figure 1, which extends towards the knife-edge region.

Figure 1 to Paragraph gliiiCrack Inspection Critical Areas
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2 Replacement of HPT 2nd-Stage Air Seal Assembly i For PW PW2037, PW2037M, and PW2040 model turbofan engines, at the next engine shop visit after the effective date of this AD, remove the HPT 2nd-stage air seal assembly, part number P/N 1A8209 or 1A8209001, and replace it with a part eligible for installation.
ii For PW F117PW100 model turbofan engines, at the next piece part opportunity after the effective date of this AD, remove the HPT 2nd-stage air seal assembly, P/N 1A8209
or 1A8209001, and replace it with a part eligible for installation.
h Definitions 1 For the purpose of this AD, an engine shop visit is the induction of an engine into the shop for maintenance involving the separation of the N or M engine flange. The
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separation of engine flanges solely for the purposes of transportation of the engine without subsequent engine maintenance does not constitute an engine shop visit.
2 For the purpose of this AD, a piecepart opportunity is:
i For the HPT 1st-stage disk, when the disk is removed from the engine and all the blades are removed;
ii For the HPT 2nd-stage hub, when the hub is removed from the engine and all the blades are removed; or iii For the HPT 2nd-stage air seal assembly, when the assembly is removed from either the HPT 1st-stage disk or the HPT
2nd-stage hub.
3 For the purpose of this AD, a part eligible for installation is an HPT 2nd-stage air seal assembly with a P/N other than 1A8209 or 1A8209001.

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i Alternative Methods of Compliance AMOCs 1 The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14
CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in Related Information. You may email your request to: ANE-AD-AMOC@
faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.

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