# Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes Equipped With Pratt & Whitney Canada Model PW127B Engines
> **Rule** · Final rule; request for comments. · Published 2001-08-07 · Effective 2001-08-22 · 66 FR 41129
## Document
- **Document number:** 01-19423
- **Category:** airworthiness
- **Manufacturer:** Fokker Model F27 Mark 050 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 41129
- **Publication date:** 2001-08-07
- **Effective date:** 2001-08-22
- **FAA docket:** Docket No. 2001-NM-127-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes equipped with certain Pratt & Whitney Canada Model PW127B engines. This action requires replacing both torque sensor No. 1 and the electrical connectors on the wiring harness between torque sensor No. 1 and the auto-feathering unit (AFU). This action is necessary to prevent inadvertent autofeathering of the propellers, due to interruption of the torque signal between torque sensor No. 1 and the AFU, which could result in loss of engine power and loss of control of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/08/07/01-19423/airworthiness-directives-fokker-model-f27-mark-050-series-airplanes-equipped-with-pratt-and-whitney)
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