AD 2021-11-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model EC 155B | Airworthiness Directives; Airbus Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
Failure of the main gearbox (MGB) fixed cowling front fitting, and subsequent MGB cowling or engine cowling detachment, which could result in damage to the helicopter, loss of helicopter control, and possible injury to persons on the ground.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the MGB front fittings within 110 flight hours after April 14, 2017, or within 660 flight hours or 23 months after the effective date of this AD, whichever occurs first. If there is a discrepancy, applicable corrective action(s) must be taken before next flight. Modifying the MGB fixed cowling attachments within 660 flight hours or 23 months after the effective date of this AD, whichever occurs first, is a terminating action for the required inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 110 flight hours after April 14, 2017, or within 660 flight hours or 23 months after the effective date of this AD, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Airbus Helicopters Model EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, and AS 365 N3 helicopters, certificated in any category, as identified in European Aviation Safety Agency (EASA) AD 2019-0008, dated January 22, 2019.
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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