AD 2015-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
Un-annunciated failures of the direct current (DC) starter generator caused caution indicators of affected systems to illuminate, prompting emergency descents and landings. This resulted from a low voltage condition on the left main DC bus, which could lead to the loss of flight management, navigation, and transponder systems during critical phases of flight.
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Required Actions
Replace the DC generator control units (GCUs) with new GCUs and replace the GCU label, as specified in paragraphs (g)(1) and (g)(2) of the AD. This action must be completed within the specified compliance times.
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Compliance Time
Within 6,000 flight hours or 36 months after the effective date of this AD, whichever occurs first.
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Affected Aircraft
Bombardier, Inc. Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 airplanes, certificated in any category, serial numbers 003 through 672 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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