AD 68-20-08
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
Improper adjustment of the Automatic Flight Control System (AFCS) electrical connectors, pin alignment, or system functional test could lead to AFCS malfunction during flight.
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Required Actions
Inspect AFCS electrical connectors for electrical integrity and pin alignment, perform a functional test of the AFCS system including specified connectors. Conduct daily pre-flight checks of pitch, roll, and yaw systems as per Sikorsky Service Bulletin and alternate checks. Measure auxiliary servo linkage adjustments to ensure .010" or less movement and perform stick jump tests. Repeat AFCS hard-over checks every 1200 hours time in service.
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Compliance Time
Prior to next AFCS flight and within the next 1200 hours time in service and thereafter at 1200 hour intervals of time in service.
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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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