AD 2002-21-51
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
Deterioration of the driven pinion bearings inside the lubrication pump can lead to pump failure and loss of oil pressure in the main gearbox (MGB), potentially resulting in MGB seizure, loss of drive to an engine and main rotor, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the magnetic chip detector plug for metal particles and the MGB oil-sight glass for dark oil. If metal particles are found, inspect the pump. If dark oil is observed, take an oil sample to confirm. If the oil sample is dark or dark purple, inspect the pump for crank pin play, out-of-round bronze bushing, offset of the driven gear pinion, metal chips, or wear. Replace the MGB and pump with airworthy components if necessary. Ensure any different MGB or pump with time-in-service meets AD requirements before installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France Model AS355E, F, F1, F2, and N helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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