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Airworthiness Directive

AD 97-20-03 62 FR 49429 Active

Federal Aviation Administration · 14 CFR part 39

Requires revising the Airplane Flight Manual (AFM) to prohibit positioning of the power levers below the flight idle stop during flight, and to add a statement of the consequences of such positioning of the power levers.

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FR document
97-25054
Amendment
39-10141
Published
1997-09-22
Effective
1997-10-27
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/97-20-03 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

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AD

97-20-03

FR doc 97-25054 · 62 FR 49429

AD 97-20-03Published 1997-09-22Effective 1997-10-27

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires revising the Airplane Flight Manual (AFM) to prohibit positioning of the power levers below the flight idle stop during flight, and to add a statement of the consequences of such positioning of the power levers.

Full official abstract

This amendment adopts a new airworthiness directive (AD), applicable to all de Havilland Model DHC-7 series airplanes, that requires revising the Airplane Flight Manual (AFM) to prohibit positioning of the power levers below the flight idle stop during flight, and to add a statement of the consequences of such positioning of the power levers. This amendment 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 this 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 when the airplane is in flight.

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All de Havilland DHC-7 Dash 7 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index