# Airworthiness Directives; Pratt & Whitney Canada PT6B-36A and PT6B-36B Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2004-10-01 · Effective 2004-10-18 · 69 FR 58824
## Document
- **Document number:** 04-21913
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Canada PT6B-36A and PT6B-36B Turboshaft
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 69 FR 58824
- **Publication date:** 2004-10-01
- **Effective date:** 2004-10-18
- **FAA docket:** Docket No. FAA-2004-19170
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney Canada (PWC) PT6B-36A and PT6B-36B turboshaft engines with compressor rear hubs, part number (P/N) 3018111 installed. This AD requires reviewing, and correcting if necessary the critical part record for compressor rear hubs, P/N 3018111. This AD also requires removing compressor rear hubs from service that exceed the published part life limit, before further flight. This AD results from the discovery of a compressor rear hub, P/N 3018111, that exceeded the published life limit. This occurred because the operator used an incorrect life limit calculation contained in a PWC Service Bulletin. We are issuing this AD to prevent uncontained failure of the compressor rear hub and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/10/01/04-21913/airworthiness-directives-pratt-and-whitney-canada-pt6b-36a-and-pt6b-36b-turboshaft-engines)
---
*AI Analytics · CC0 1.0*