AD 99-07-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R22 | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 ALPHA | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 BETA | Airworthiness Directives; Robinson Helicopter Company Model R22 Helicopters |
| aircraft | Robinson Helicopter Company | R22 MARINER | Airworthiness Directives; Robinson Helicopter Company Model R22 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 and subsequent loss of control.
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Required Actions
Insert a Special Pilot Caution into the Normal Procedures section of the Rotorcraft Flight Manual before further flight. The caution includes procedures for autorotation entry and a before-flight sprag clutch check by splitting tachometer needles. Compliance must be completed prior to further flight.
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Compliance Time
Before further flight
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Affected Aircraft
Robinson Helicopter Company Model R22 helicopters, serial numbers 0002 through 2862, with sprag clutch part number A188-2, serial numbers 3708-3757, 3808-3893, and 3908-4207.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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