AD 97-02-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Robinson Helicopter Company | R44 | Airworthiness Directives; Robinson Helicopter Company Model R44 Helicopters |
Unsafe Condition
Pilot mismanagement of the main rotor (M/R) RPM could result in unrecoverable M/R stall and subsequent loss of control of the helicopter.
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Required Actions
Adjust the A569-6 low RPM warning unit to activate the warning horn and caution light between 96% and 97% rotor RPM. Revise the R44 Rotorcraft Flight Manual to prohibit flight with the throttle governor off except for inflight system malfunction or emergency procedures training.
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Compliance Time
within 30 days after the effective date of this AD
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Affected Aircraft
Robinson Helicopter Company Model R44 helicopters, 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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