AD 96-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76B | Airworthiness Directives; Sikorsky Aircraft Model S-76B Helicopters |
Unsafe Condition
Fatigue crack in the drive shaft caused by fretting of a balance weight rivet washer, leading to failure of the drive shaft, loss of power to the rotor system, and subsequent forced landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 6 hours time-in-service (TIS) after the effective date, visually inspect the drive shaft for cracks around each rivet using a 10X magnifying glass and check for loose balance weights by hand. If cracks or loose weights are found, replace the drive shaft before further flight. Thereafter, repeat inspections every 6 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 hours time-in-service (TIS) after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Model S-76B helicopters with engine drive shaft assembly part numbers 76361-09202-044, -047, -049, or -051, and specific rivet configurations (P/N CR3523P-8-XX or NAS1738MW6-X with or without washers).
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.