AD 2022-25-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes |
| aircraft | Bombardier | Various | Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes |
| aircraft | de Havilland | Aircraft of Canada Limited Model DHC-8-402 | Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes |
Unsafe Condition
The actual operating temperatures within the integrated flight cabinet (IFC) were significantly higher than anticipated during certification, which could lead to uncontrolled autopilot pitch trim servo runaway and/or failure of the stall warning and stick pusher, resulting in reduced controllability of the airplane.
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Required Actions
A modification to improve the IFC cooling capacity, including reworking the forward and aft avionics rack side panels, removing the piccolo tube assemblies, doing a general visual inspection for contamination of the IFCs and avionics rack, cleaning any contamination found, installing and routing new cooling ducts, and installing two new extraction plenums in the avionics rack cooling system.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
De Havilland Aircraft of Canada Limited (Type Certificate previously held by Bombardier Inc.) Model DHC-8-402 airplanes, serial numbers 4095 through 4633 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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