# Airworthiness Directives; Pratt & Whitney JT8D and JT3D Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 1998-12-31 · Effective 1999-01-05 · 63 FR 72148
## Document
- **Document number:** 98-34706
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney JT8D and JT3D Series Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 63 FR 72148
- **Publication date:** 1998-12-31
- **Effective date:** 1999-01-05
- **FAA docket:** Docket No. 98-ANE-77-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to Pratt & Whitney (PW) JT8D and JT3D series turbofan engines. This action requires operators to remove and replace with serviceable parts, certain stage 7 through stage 15 high-pressure compressor (HPC) disks identified by part number and serial number. This amendment is prompted by a report of an uncontained failure of a stage 8 HPC disk during a takeoff roll that resulted in damage to the airplane. The actions specified in this AD are intended to prevent the failure of a high-pressure compressor disk due to Cadmium embrittlement, resulting in uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/12/31/98-34706/airworthiness-directives-pratt-and-whitney-jt8d-and-jt3d-series-turbofan-engines)
---
*AI Analytics · CC0 1.0*