AD Amdt-39-10943
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S- 61A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S- 61A, D, E, L, N, NM, R, and V Helicopters |
Unsafe Condition
Fatigue crack in the main rotor shaft that could result in shaft structural failure, loss of power to the main rotor, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 30 calendar days or 240 hours time-in-service after the effective date, inspect the main rotor shaft for cracks using nondestructive inspection (NDI). Remove and replace any shaft with cracks. Mark shafts appropriately and record log book entries to determine retirement life. Establish a new retirement life for the shaft based on time-in-service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 calendar days or 240 hours time-in-service after the effective date, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-61A, D, E, L, N, NM, R, and V helicopters with main rotor shaft part numbers S6135-20640-001, S6135-20640-002, or S6137-23040-001, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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