AD 97-20-10 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-201 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-202 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; de Havilland Model DHC-8-100, -200, and -300 Series Airplanes |
Unsafe Condition
Simultaneous power loss to both attitude and heading reference systems (AHRS) could result in reduced controllability of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 400 hours time-in-service after November 3, 1997, modify the AHRS's in accordance with Bombardier Alert Service Bulletin S.B. A8-34-117, Revision C, dated February 14, 1997. Alternative methods of compliance or adjustments to compliance time may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 400 hours time-in-service after November 3, 1997
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Affected Aircraft
de Havilland Model DHC-8-100, -200, and -300 series airplanes; serial numbers 3 through 472 inclusive; certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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