AD 2020-21-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS-365N2 | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
A foreign object obstructing the oil duct of a TGB control bearing, which could affect the correct operation of the TGB and possibly result in reduced control of the helicopter.
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Required Actions
Inspect the TGB housing recess and TGB oil duct housing, and depending on the findings, perform applicable investigative and corrective actions. If oil retention is found and the two T holes are not visible, remove the TGB control rod and inspect for and remove any foreign objects in the TGB oil duct. If oil retention is found and the two T holes are not visible after additional inspections, mark the TGB as not fit for helicopter installation and return it to Airbus Helicopters. If no oil retention is found and the two T holes are visible after additional inspections, remove any foreign objects in the TGB oil duct and inspect for proper oil flow at the end of the BTP oil duct cover. If the oil does not flow properly, mark the TGB as not fit for helicopter installation and return it to Airbus Helicopters. If the oil flows properly, replace the TGB control rod bearing with a new bearing.
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Compliance Time
Within 55 hours time-in-service or 5 months, whichever occurs first.
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Affected Aircraft
Airbus Helicopters Model AS-365N2, AS 365 N3, EC 155B, EC155B1, and SA-365N1 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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