AD 2013-22-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
Corrosion of the trunnion shaft of the rudder feel trim unit (RFTU) can cause seizure, impeding rudder pedal movement, which could lead to a rudder control jam or a large and rapid alternating rudder input, potentially causing structural failure of the vertical fin.
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Required Actions
Inspect to determine if certain RFTUs are installed. Perform an operational check for signs of seizure of affected parts. Conduct repetitive lubrication of certain RFTUs. Replace the RFTU if necessary. Installing replacement RFTUs with conformal bushings terminates the repetitive lubrication requirements.
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Compliance Time
Within 200 flight hours or 2 months, whichever occurs first after the effective date of this AD, for performing the operational check.
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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