AD 99-01-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76C | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76C Helicopters |
Unsafe Condition
Air getting into a fuel supply line when there is less than 250 lbs. of fuel in either fuel tank, leading to engine flame-out and a subsequent forced landing.
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Required Actions
Before further flight, install a placard adjacent to the fuel quantity gauge stating 'No flight operations to be conducted with less than 250 lbs. fuel in each tank' and revise the Rotorcraft Flight Manual (RFM) by inserting this AD in the Operating Limitations section. Within 50 hours time-in-service or 30 calendar days, whichever occurs first, defuel both tanks until the #1 and #2 FUEL LOW warning lights illuminate, start engines in direct feed and crossfeed positions, monitor for engine start issues, and inspect fuel suction lines for unseated fittings, corrosion, or pitting, replacing or reinstalling components as necessary.
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Compliance Time
Before further flight and within 50 hours time-in-service or 30 calendar days, whichever occurs first.
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Affected Aircraft
Sikorsky Aircraft Corporation Model S-76C helicopters, serial numbers 760477, 760479, 760481 through 760487, 760490, 760491, and 760493, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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