AD Amdt-39-10514
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Ltd | Airworthiness Directives; Allison Engine Company Model 250-C47B Turboshaft Engines |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Allison Engine Company Model 250-C47B Turboshaft Engines |
| engine | Allison | Engine Company Model 250-C47B | Airworthiness Directives; Allison Engine Company Model 250-C47B Turboshaft Engines |
Unsafe Condition
ECUs with annunciated hard faults due to corrosion on internal connectors
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install ECUs with improved resistance to corrosion, replace engine main electrical harness assembly, install new hydromechanical unit (HMU), remove placard notifying pilot of overspeed protection system disablement, revise Bell Helicopter Textron Model 407 Rotorcraft Flight Manual
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Allison Engine Company Model 250-C47B turboshaft engines
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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