AD 76-05-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Sundstrand | 54H | HAMILTON STANDARD Models 54H60-63, -81, -91, -111, -117 and -125 Propellers |
Unsafe Condition
Wear of pitchlock regulator extension sleeve threads resulting in looseness and possible separation of the extension sleeve from the pitchlock regulator.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check torque required to turn the extension sleeve P/N 541850, Rev. C or later in a clockwise direction per Hamilton Standard Service Bulletin HS Code 54H60 No. A 73, Rev. 1 or equivalent. If running torque is less than 100 ft. lbs., remove and inspect threads for wear; remove worn sleeves. Return regulator to service if torque does not reach 130 ft. lbs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 200 hours time in service after the effective date of this AD, unless already accomplished within the last 1800 hours time in service, and thereafter at intervals not to exceed 2000 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hamilton Standard Models 54H60-63, -81, -91, -111, -117 and -125 Propellers.
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.