AD 63-24-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; VERTOL Model 107-II Helicopters |
Unsafe Condition
Fatigue failure of the aft rotor transmission quill shaft P/N 107D2067-1 and wear on the internal splines of the input pinion and collector gears.
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Required Actions
Inspect mix box and aft transmission assemblies against Vertol Service Bulletin 107-113; retire quill shafts with 120+ hours' time in service or exhibiting cracks/wear steps; replace gears with wear steps; inspect oil jets. Alternatively, install tapered gasket seal shims, modify transmission lower case for new lubrication, perform reassembly inspections per SB 107-182, and reidentify components.
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Compliance Time
Before further flight and every 120 hours' time in service thereafter, except spare assemblies must comply prior to installation.
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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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