AD 99-07-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R44 | Airworthiness Directives; Robinson Helicopter Company Model R44 Helicopters |
Unsafe Condition
Cracked or fractured sprag ends in the sprag clutch assembly, due to a change in manufacturing process, could result in loss of main rotor RPM during autorotations.
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Required Actions
Insert a Special Pilot Caution into the Normal Procedures section of the Rotorcraft Flight Manual (RFM) before further flight. The caution includes procedures for autorotation maneuvers and a before-every-flight sprag clutch check (split tach needles) to ensure proper clutch function.
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Compliance Time
Before further flight
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Affected Aircraft
Robinson Helicopter Company Model R44 helicopters, serial numbers 0001 through 0541, 0543, 0556, and 0565, with sprag clutch part number C188-3, serial numbers 0003 through 0452.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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