# Proposed AD 97-NM-35-AD: Fairchild Model F-27 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-23-15
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 24, 1997, 62 FR 19948
- Comments due: June 2, 1997
- Became: [AD 97-23-15](https://openairdocs.org/ad/97-23-15)
- Docket: 97-NM-35-AD
- FR document: 97-10566
- Official PDF: https://openairdocs.org/files/sha256/d5/60/d560bd8806c87525624ba01941d611f7ecf5b1977c81148b980742fb1b8d7493 (from https://www.govinfo.gov/content/pkg/FR-1997-04-24/pdf/97-10566.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/04/24/97-10566/airworthiness-directives-fairchild-model-f-27-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-35-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Fairchild Model F-27 series airplanes. This proposal would require revising the Airplane Flight Manual (AFM) to prohibit positioning power levers below the flight idle stop during flight, and to provide a statement of the consequences of positioning the power levers below the flight idle stop during flight. The proposed AD is prompted by incidents and accidents involving airplanes equipped with turboprop engines in which the propeller ground beta range was used improperly during flight. The actions specified by the proposed AD are intended to prevent loss of airplane controllability, or engine overspeed and consequent loss of engine power caused by the power levers being positioned below the flight idle stop while the airplane is in flight.

## Notices in this docket

- Apr 24, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-10566, comments due Jun 2, 1997 (https://www.federalregister.gov/documents/1997/04/24/97-10566/airworthiness-directives-fairchild-model-f-27-series-airplanes)

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