AD 2021-11-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leonardo | S.p.a. | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
Reports of failed nose landing gear (NLG) retraction actuators during the acceptance test procedures on the ground on the final assembly line. Investigation revealed that excessive friction inside the NLG retraction actuator caused internal damage, resulting in mechanical jam of the actuator rotary shaft. The same failure mode can affect the main landing gear (MLG) retraction actuators.
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Required Actions
Depending on the helicopter configuration, various modifications, installation checks, inspections of the NLG and MLG retraction actuators and of the plungers of the NLG and MLG up down lock actuators, and corrective actions if necessary. The modifications include replacing the actuators, installing enhanced landing gear retracting actuators, modifying the landing gear actuator control box, improving the landing gear proximity switch, and doing checks and measurements. Corrective actions include replacing the NLG and MLG lock support buffer, reinstalling the NLG and MLG retracting electrical actuator, shimming gaps, adjusting the position of the NLG retracting lever, applying lubricant, installing a pin, replacing washers, and reinstalling the NLG assembly.
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Compliance Time
Within 200 hours time-in-service (TIS)
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Affected Aircraft
Leonardo S.p.a. Model AW169 helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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