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Airworthiness Directive

AD 97-20-10 R1 63 FR 42219 Active

Federal Aviation Administration · 14 CFR part 39

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

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FR document
98-21097
Amendment
39-10697
Published
1998-08-07
Effective
1998-09-11
Models covered
1

Last live check: 2026-08-19

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AD

97-20-10 R1

FR doc 98-21097 · 63 FR 42219

AD 97-20-10 R1Published 1998-08-07Effective 1998-09-11

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 revises an existing airworthiness directive (AD), applicable to certain de Havilland Model DHC-8-100, -200, and - 300 series airplanes, that currently requires modification of the attitude and heading reference systems (AHRS). That action was 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 is connected. The actions specified by that AD are intended to prevent simultaneous power loss to both AHRS's, which could result in reduced controllability of the airplane. This amendment reduces the applicability of the existing AD.

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All de Havilland DHC-8 Dash 8 directives

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Applies to 1 model in our index