# Airworthiness Directives; Pratt & Whitney Turbofan Engines
> **Rule** · Final rule. · Published 2021-07-28 · Effective 2021-09-01 · 86 FR 40299
## Document
- **Document number:** 2021-15947
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 40299
- **Publication date:** 2021-07-28
- **Effective date:** 2021-09-01
- **FAA docket:** Docket No. FAA-2020-0442
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney (PW) PW2037, PW2037M, PW2040, and F117-PW-100 model turbofan engines. This AD was prompted by a report of an uncontained engine failure resulting from cracks in the knife edge of the high- pressure turbine (HPT) 2nd-stage air seal assembly. This AD requires fluorescent penetrant inspections (FPIs) and visual inspections of the HPT 2nd-stage air seal assembly and, depending on the results of the inspections, replacement of the HPT 2nd-stage air seal assembly with a part eligible for installation. This AD also requires replacement of the affected HPT 2nd-stage air seal assembly, depending on the engine model, at either the next engine shop visit or the next piece-part opportunity. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/07/28/2021-15947/airworthiness-directives-pratt-and-whitney-turbofan-engines)
---
*AI Analytics · CC0 1.0*