AD 85-15-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A Helicopters |
Unsafe Condition
Failure of certain tail rotor drive shaft bearings which may have been installed without lubricant.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove all Part Number SB1138-101 bearings manufactured by MRC not identified with a white dot on the grease fitting or a serial number and with under 100 hours operating time. Replace removed bearings with MRC P/N SB1138-101 bearings identified with a white dot, serial number, or both, or with Fafnir's approved alternate bearing. Ferry aircraft per FAR Sections 21.197 and 21.199 if needed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-76A 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.