# Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2022-04-15 · Effective 2022-05-02 · 87 FR 22441
## Document
- **Document number:** 2022-08045
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Division Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 87 FR 22441
- **Publication date:** 2022-04-15
- **Effective date:** 2022-05-02
- **FAA docket:** Docket No. FAA-2022-0386
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 model turbofan engines. This AD was prompted by an in-flight shutdown (IFSD) of an engine due to an air/oil heat exchanger leak caused by corrosion and subsequent investigation by the manufacturer that revealed additional air/oil heat exchanger leaks. This AD requires an inspection of the air/oil heat exchanger and, depending on the results of the inspection, replacement of the air/oil heat exchanger. This AD also provides instructions for storing an air/ oil heat exchanger after inspection. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/04/15/2022-08045/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)
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