AD 2011-13-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
Unsafe Condition
Excessive wear of the shaft (tailstock) swaged bearing liners in elevator power control units (PCUs) due to paint contamination between the bearing roller and bearing liner, which could seize the bearing and lead to loss of controllability.
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Required Actions
Perform a free-play check for shaft swaged bearings in elevator PCUs. Replace the elevator PCU with a serviceable one if excessive free-play is found, before further flight.
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Compliance Time
Within 2,000 flight hours after the effective date for airplanes with 8,000 or more total flight hours, or within 6,000 flight hours or before 10,000 total flight hours, whichever occurs first, for airplanes with less than 8,000 total flight hours.
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes with serial numbers 4001 through 4304 inclusive, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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