AD 2017-06-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
Overheating of the negative interlock and ground wires at the Emergency Light System Power Supplies, caused by the wire gauge being incompatible with the current load during operational checks, leading to insulation degradation.
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Required Actions
Change the wiring gauge for the affected Emergency Lights Power Supplies wiring from 22 to 20 American wire gauge (AWG) in accordance with Bombardier Service Bulletin 84-33-12, Revision B.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400 series airplanes, as specified in the referenced service bulletin.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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