# Proposed AD 97-NM-36-AD: de Havilland Model DHC-7 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-20-03
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 15, 1997, 62 FR 18304
- Comments due: May 23, 1997
- Became: [AD 97-20-03](https://openairdocs.org/ad/97-20-03)
- Docket: 97-NM-36-AD
- FR document: 97-9593
- Official PDF: https://openairdocs.org/files/sha256/cd/b8/cdb8e2ead7283b1164c716987dd9825398c05d10f0d55ec7a0db65d023937242 (from https://www.govinfo.gov/content/pkg/FR-1997-04-15/pdf/97-9593.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/04/15/97-9593/airworthiness-directives-de-havilland-model-dhc-7-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-36-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all de Havilland Model DHC-7 series airplanes. This proposal would require revising the Airplane Flight Manual (AFM) to prohibit positioning of the power levers below the flight idle stop while the airplane is in flight, and to provide a statement of the consequences of positioning the power levers below the flight idle stop. This proposal is prompted by incidents and accidents involving airplanes equipped with turboprop engines in which the propeller beta 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 15, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-9593, comments due May 23, 1997 (https://www.federalregister.gov/documents/1997/04/15/97-9593/airworthiness-directives-de-havilland-model-dhc-7-series-airplanes)

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