AD Amdt-39-14621
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | France Model AS355E, F, F1, F2, and N | Airworthiness Directives; Eurocopter France Model AS355E, F, F1, F2, and N Helicopters |
Unsafe Condition
Insufficiently lubricated power transmission assembly deteriorates, causing loss of the drive train for one or both engines, leading to loss of control of the helicopter.
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Required Actions
Inspect the magnetic chip detector plug and main gearbox oil-sight glass daily or every 10 flight hours. If sludge is found on the chip detector or dark oil is observed, inspect the lubrication pump. Replace the main gearbox and pump if specific defects are found during inspection.
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Compliance Time
Before further flight
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Affected Aircraft
Eurocopter France Model AS355E, F, F1, F2, and N helicopters with main gearbox lubrication pump part number 355A32-0700-01, serial number 5731 or higher, or with a serial number below 5731 if the pump has been overhauled or repaired after June 1, 1995.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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