AD 2004-06-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-76 A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76 A, B, and C Helicopters |
Unsafe Condition
Intermittent malfunction of the No. 2 generator causing both autopilots to disengage, leading to potential loss of control during IMC operations.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Test the No. 1 inverter wiring to the DC essential bus. If wired to the DC essential bus, modify the wiring to connect the No. 1 inverter to the No. 2 DC primary bus and the No. 2 inverter to the DC essential bus. If the wiring modification is not performed, revise the Rotorcraft Flight Manual (RFM) to limit IMC airspeed and install a placard near the airspeed indicator.
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Compliance Time
Within 30 days for the wiring modification. Before further flight if the wiring modification is not performed.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76 A, B, and C helicopters with dual channel autopilot and dual inverters installed.
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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