# Airworthiness Directives; Pratt & Whitney JT9D-59A, -70A, -7Q, and -7Q3 Turbofan Engines
> **Rule** · Final rule. · Published 2002-05-23 · Effective 2002-06-27 · 67 FR 36092
## Document
- **Document number:** 02-12630
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 67 FR 36092
- **Publication date:** 2002-05-23
- **Effective date:** 2002-06-27
- **FAA docket:** Docket No. 2001-NE-27-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), that is applicable to Pratt & Whitney (PW) JT9D-59A, -70A, -7Q, and -7Q3 turbofan engines. This amendment requires fluorescent penetrant inspection of the high pressure turbine (HPT) second stage airseal knife edges for cracks, each time the airseal is accessible. This amendment is prompted by reports of cracks found in the knife edges of HPT second stage airseals during HPT disassembly. The actions specified by this AD are intended to prevent failure of HPT second stage airseals due to cracks in the knife edges, which if not detected could result in uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2002/05/23/02-12630/airworthiness-directives-pratt-and-whitney-jt9d-59a--70a--7q-and--7q3-turbofan-engines)
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