# Proposed AD 99-ANE-02-AD: Pratt & Whitney PW2000 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 23, 1999, 64 FR 13932
- Comments due: April 22, 1999
- Docket: 99-ANE-02-AD
- FR document: 99-6979
- Official PDF: https://openairdocs.org/files/sha256/5c/a7/5ca79341a91a7698925ce36f3855f632f34ec251a9bfccc83f3302916d4874f2 (from https://www.govinfo.gov/content/pkg/FR-1999-03-23/pdf/99-6979.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/03/23/99-6979/airworthiness-directives-pratt-and-whitney-pw2000-series-turbofan-engines
- Page: https://openairdocs.org/proposed/99-ANE-02-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Pratt & Whitney (PW) PW2000 series turbofan engines. This proposal would require initial and repetitive inspections of certain High Pressure Turbine (HPT) stage 1 and stage 2 disks utilizing an improved ultrasonic method when the disk is exposed during a shop visit, and if a subsurface anomaly is found, removal from service and replacement with a serviceable part. This proposal is prompted by the results of a stage 1 HPT disk fracture investigation, which has identified a population of HPT stage 1 and 2 disks that may have subsurface anomalies formed during a forging process. The actions specified by the proposed AD are intended to prevent HPT disk fracture, which could result in an uncontained engine failure, and damage to the aircraft.

## Notices in this docket

- Mar 23, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-6979, comments due Apr 22, 1999 (https://www.federalregister.gov/documents/1999/03/23/99-6979/airworthiness-directives-pratt-and-whitney-pw2000-series-turbofan-engines)

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