AD 2013-13-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
Excessive wear of the shaft swaged bearing liners in the elevator power control unit (PCU) tailstock end due to paint contamination, leading to excessive free-play, which could result in excessive airframe vibrations, difficulties in pitch control, and loss of controllability of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the free-play of the shaft swaged bearing installed in the tailstock end of each elevator PCU. Replace any PCU on which the bearing exceeds allowable limits with a serviceable PCU.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of this AD.
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400 series airplanes with serial numbers 4001 through 4334 inclusive, and 4336.
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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