AD 68-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-61A | Airworthiness Directives; Sikorsky Models S-61A, S-61L, and S-61N Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61L | Airworthiness Directives; Sikorsky Models S-61A, S-61L, and S-61N Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-61N | Airworthiness Directives; Sikorsky Models S-61A, S-61L, and S-61N Helicopters |
Unsafe Condition
Failure of the automatic flight control system (AFCS) could result in loss of control of the helicopter.
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Required Actions
Deactivate the AFCS by disconnecting power sources to the AFCS system and channel monitor panel, pull circuit breakers, safety the buttons, disconnect electrical connectors at aux. servos, secure to wire bundles, and ground all pins on each plug. Reactivation requires incorporation of approved alterations or service bulletins.
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Compliance Time
within the next ten hours time in service after the effective date of this Airworthiness Directive unless already accomplished
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Affected Aircraft
Sikorsky Models S-61A, S-61L, and S-61N Helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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