# Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines
> **Rule** · Final rule. · Published 1999-09-24 · Effective 1999-11-23 · 64 FR 51681
## Document
- **Document number:** 99-24699
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney PW2000 Series Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 51681
- **Publication date:** 1999-09-24
- **Effective date:** 1999-11-23
- **FAA docket:** Docket No. 99-NE-02-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Pratt & Whitney (PW) PW2000 series turbofan engines, that requires initial and repetitive inspections of certain High Pressure Turbine (HPT) stage 1 and stage 2 disks utilizing an improved ultrasonic inspection method performed at an approved facility when the disk is exposed during a shop visit, and if a crack indicating a subsurface anomaly is found, removal from service and replacement with a serviceable part. This amendment 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 this AD are intended to prevent HPT disk fracture, which could result in an uncontained engine failure, and damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/24/99-24699/airworthiness-directives-pratt-and-whitney-pw2000-series-turbofan-engines)
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