# Airworthiness Directives; Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4090, and PW4090-3 Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2003-06-30 · Effective 2003-07-15 · 68 FR 38592
## Document
- **Document number:** 03-15992
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 68 FR 38592
- **Publication date:** 2003-06-30
- **Effective date:** 2003-07-15
- **FAA docket:** Docket No. 2003-NE-24-AD
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney (PW) PW4074, PW4074D, PW4077, PW4077D, PW4090, and PW4090-3 turbofan engines with high pressure compressor (HPC) rear cases, part numbers (P/Ns) 55H425-01, 55H385-01, and 56H396-01 installed. This AD requires initial and repetitive visual or fluorescent penetrant inspections (FPI) of the J flange on the HPC rear case, and removal from service of the rear case based on certain inspection results. This AD is prompted by reports of cracks propagating from bolt holes in the HPC rear case J flange, and reports of high-cycle HPC rear cases exhibiting cracks propagating into the shell wall. The actions specified in this AD are intended to prevent fracturing and rupturing of the HPC rear case, resulting in uncontained engine failure.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/06/30/03-15992/airworthiness-directives-pratt-and-whitney-pw4074-pw4074d-pw4077-pw4077d-pw4090-and-pw4090-3)
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