AD 85-11-51 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab AB, Saab Aerosystems | 340A (SAAB SF340A) | Airworthiness Directives; SAAB-FAIRCHILD Model SF-340A Airplanes |
Unsafe Condition
Incorrect attitude indications due to improper initialization of inertially-based attitude heading reference systems (AHRS) caused by voltage transients or aircraft movement during alignment, leading to excessive inertial errors.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate specified initialization procedures into the Airplane Flight Manual, ensure AHRS initialization with both engines running and no aircraft movement, and comply with post-initialization checks before takeoff. Modification 1438 via SAAB Service Bulletin SF 340-34-038 or equivalent may be used as a terminating action.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
before further flight after the effective date of this airworthiness directive (AD)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Saab AB, Saab Aerosystems Model SF-340A airplanes 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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