AD Amdt-39-10233
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Allison | Engine Company Model 250-C40B | Airworthiness Directives; Allison Engine Company Model 250-C40B Turboshaft Engines |
Unsafe Condition
Manufacturing defect in certain helical power takeoff gearshaft assemblies, which could result in fatigue failure and subsequent loss of engine power and inflight engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard requiring pilots to record torque level and time in service operating above 86% engine torque until defective parts are replaced. Replace defective parts no later than December 31, 2000, or earlier if maintenance actions are accomplished or operational restrictions are exceeded.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight if maintenance actions are accomplished or operational restrictions are exceeded, otherwise no later than December 31, 2000.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Allison Engine Company Model 250-C40B turboshaft engines with helical power takeoff gearshaft assemblies identified by specific serial numbers.
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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