# Proposed AD FAA-2021-0959: Pratt & Whitney Division Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-06-09
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 28, 2021, 86 FR 73699
- Comments due: January 27, 2022
- Became: [AD 2022-06-09](https://openairdocs.org/ad/2022-06-09)
- Docket: FAA-2021-0959 (https://www.regulations.gov/docket/FAA-2021-0959, where comments are filed)
- Project: AD-2021-00830-E
- FR document: 2021-27840
- Official PDF: https://openairdocs.org/files/sha256/f9/f2/f9f2434f666f11083e93585a5d87ba6fbd5dffb802b6ef2cba22d70a870f6bd8 (from https://www.govinfo.gov/content/pkg/FR-2021-12-28/pdf/2021-27840.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/12/28/2021-27840/airworthiness-directives-pratt-and-whitney-division-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2021-27840-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0959

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2019-03-01 and AD 2021-05-51, which apply to certain Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 model turbofan engines. AD 2019-03-01 requires performing initial and repetitive thermal acoustic image (TAI) inspections for cracks in certain 1st-stage low-pressure compressor (LPC) blades and removal of those blades that fail inspection. AD 2021-05-51 requires performing a one-time TAI inspection for cracks in certain 1st-stage LPC blades and removal of those blades that fail inspection. Since the FAA issued AD 2019-03-01 and AD 2021-05-51, the manufacturer determined the need to add initial and repetitive ultrasonic testing (UT) inspections of the 1st-stage LPC blades. This proposed AD would require initial and repetitive UT inspections and TAI inspections for cracks in certain 1st-stage LPC blades and removal of those blades that fail inspection. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Dec 28, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-27840, comments due Jan 27, 2022 (https://www.federalregister.gov/documents/2021/12/28/2021-27840/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)

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