AD 72-16-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 107-II | Airworthiness Directives; BOEING-VERTOL Model 107-II Helicopters |
Unsafe Condition
Failure of the aft transmission collector gear or separation of the aft transmission planetary carrier retention nut may cause dephasing of the main rotors.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for cracks and flat spline root radii and shot peen internal splines of specified collector gears; change part number identification per service bulletin. Loosen, retorque, and install lock pins in the planetary carrier retention nut; mark transmission nameplate per service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 15 hours in service after the effective date of this AD and within 50 hours time in service after last retorquing of planet carrier retention nut.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
BOEING-VERTOL Model 107-II helicopters certificated in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.