AD 87-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A/B Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-76B | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-76A/B Series Helicopters |
Unsafe Condition
Possible loss of electrical power due to DC generator ground failure.
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Required Actions
Perform inspection of GCU wiring configuration and connections, inspect generators' ground and power path connections for corrosion and proper torque, inspect GCU ground connections configuration, modify and repair as necessary, in accordance with Sikorsky Alert Service Bulletin ASB-76-24-8.
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Compliance Time
within the next 25 hours' time in service
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A/B series helicopters, certified in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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