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Airworthiness Directive

AD 97-20-10 62 FR 50861 Active

Federal Aviation Administration · 14 CFR part 39

Requires modification of the attitude and heading reference systems (AHRS).

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FR document
97-25416
Amendment
39-10147
Published
1997-09-29
Effective
1997-11-03
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/97-20-10 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

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AD

97-20-10

FR doc 97-25416 · 62 FR 50861

AD 97-20-10Published 1997-09-29Effective 1997-11-03

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 modification of the attitude and heading reference systems (AHRS).

Full official abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain de Havilland Model DHC-8-100, -200, and -300 series airplanes, that requires modification of the attitude and heading reference systems (AHRS). This amendment is prompted by a report of loss of power to both AHRS's during flight due to a faulty terminal block to which the signal ground for the AHRS's are connected. The actions specified by this AD are intended to prevent simultaneous power loss to both AHRS's, which could result in reduced controllability of the airplane.

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All de Havilland DHC-8 Dash 8 directives

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Applies to 1 model in our index