Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes
airworthiness · Rule · Final rule. · Published 1997-09-29 · Effective 1997-11-03 · 62 FR 50861
Document
Document number
97-25416
Federal Register citation
62 FR 50861
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
1997-09-29
Effective date
1997-11-03
FAA docket
Docket No. 97-NM-63-AD
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.