AD 2009-12-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | DHC-8-400 | Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes |
Unsafe Condition
Failure of a shaft (tailstock) on an elevator Power Control Unit (PCU), Part Number 390600-1007, due to a material defect. Continued actuation of the affected PCU caused damage to the surrounding structure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect elevator PCU serial numbers to identify suspect units. Perform a daily check for correct operation of all suspect PCUs. Replace all suspect PCUs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bombardier Model DHC-8-400, DHC-8-401, and DHC-8-402 airplanes, certificated in any category, serial numbers 4135 through 4149 inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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