AD 75-11-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Erickson Air-Crane | S-64E | Airworthiness Directives; Sikorsky Models S-64E and S-64F Helicopters |
| aircraft | Erickson Air-Crane | S-64F | Airworthiness Directives; Sikorsky Models S-64E and S-64F Helicopters |
Unsafe Condition
Failure of the torquemeter engine to gearbox shaft and gear assembly and consequent secondary damage to the main rotor control system components.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove torquemeter engine to gearbox shaft and gear assemblies with 3000 or more hours total time in service. Replace with P/N 6435-20564-042 assemblies having less than 3000 hours time in service, P/N 6435-20564-044 assemblies, or an equivalent approved by the FAA. Ensure replacement P/N 6435-20564-042 assemblies are removed before accumulating 3000 hours time in service.
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 Models S-64E and S-64F helicopters with torquemeter engine to gearbox shaft and gear assemblies P/N 6435-20564-042
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.