Airworthiness directives › 2021-14-13
AD 2021-14-13 Airworthiness Directives; Pratt & Whitney Turbofan Engines
Applicability*9
This AD applies to all Pratt & Whitney (PW) PW2037, PW2037M, PW2040, and F117-PW-100 model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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 2nd-stage 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 (g)(1)(i): Guidance on striping the knife edge coating from the HPT 2nd-stage air seal assembly required by paragraph (g)(1)(i) of this AD can be found Chapter 72-52-60, 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 (g)(1)(i) of this AD, remove the HPT 2nd-stage air seal assembly from service and replace it with a part eligible for installation. (iii) During the visual inspection or FPI required by paragraph (g)(1)(i) 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 (g)(1)(iii) 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 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. ER28JY21.013 (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 1A8209-001, and replace it with a part eligible for installation. (ii) For PW F117-PW-100 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 1A8209-001, and replace it with a part eligible for installation.
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.
Affected ADs
None.
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