AD 68-19-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61A | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61D | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61E | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61NM | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61R | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61V | Airworthiness Directives; Sikorsky Model S-61 Series helicopters |
Unsafe Condition
Failure of the main rotor blade spindle due to being salvaged or having accumulated 3000 or more hours' time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and replace main rotor blade spindles with specified part numbers if salvaged or exceeding 3000 hours' time in service. Replace non-salvaged spindles before accumulating 3000 hours' time in service. Remove specific serial numbered spindles before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight or before the accumulation of 3000 hours' time in service as applicable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R, S-61V helicopters with main rotor blade spindles P/Ns S6110-23325-1, S6110-23325-2, and S6112-23025-1.
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
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