AD 85-14-52
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; DeHavilland Model DHC-8-101 Airplanes |
Unsafe Condition
Flap drive power unit malfunctions could lead to flap position discrepancies or failure during flight.
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Required Actions
Incorporate four specific limitations into the AFM, including VFE speed restriction and flap monitoring requirements. Replace flap drive power units with modified units per DHC Service Bulletin 8-27-6 within two weeks after December 31, 1985.
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Compliance Time
prior to further flight and within two weeks after the effective date of this amendment
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Affected Aircraft
DeHavilland Model DHC-8-101 airplanes equipped with Sunstrand Part Number 734177A or 734177B, Serial Numbers 101, 103-105 inclusive, and 107-110 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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