AD 63-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; VERTOL Model 107-II Helicopters |
Unsafe Condition
Fatigue cracks in the aft rotor vertical drive shaft and fatigue failure of the mixing gearbox collector gear during bench testing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace before further flight forward rotor transmission shafts and carrier assemblies P/N 107D1259-1, -3, -5, -6, -8 and aft rotor drive shaft extensions P/N 107D3147-1, -3, -4, -6 that have accumulated specified hours. Retire shafts prior to reaching 150, 2,500, or 1,500 hours' time in service depending on part number. Retire collector gear P/N 107D2066-4 after 150 hours total time or 8 hours single engine time, unless replaced with P/N 107D2066-10 and mixing gearbox P/N 107D2003-10.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
VERTOL Model 107-II Helicopters, Serial Numbers 2 and Up.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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