AD 2010-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
Unsafe Condition
Valves manufactured with an incorrect wall thickness caused cracking, external weeping, and pressure loss, leading to a loss of hydraulic fluid and subsequent loss of spoiler and/or rudder control.
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Required Actions
Inspect left-hand and right-hand spoiler unload and rudder shutoff valves for leaking and weeping. Replace discrepant valves with new or serviceable ones. Eventually replace all valves with a certain part number.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, DHC-8-401, and DHC-8-402 series airplanes, serial numbers 4105 through 4179 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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