AD 2010-19-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives Eurocopter France (ECF) Model SA-365N1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 Helicopters |
Unsafe Condition
Separation and loss of a stainless steel ring (75 mm in diameter) from a tail rotor blade sleeve, resulting in severe, high-frequency vibrations, which can lead to damage to the fenestron blades, loss of yaw control, 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 each blade of the fenestron tail rotor to determine whether there has been any outward slippage of the stainless steel ring around the sleeve of each blade where the blade enters the fenestron hub. If the stainless steel ring has slipped outward, replace the blade with an airworthy blade before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service (TIS), unless done previously.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France (ECF) Model SA-365N1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 helicopters, with a fenestron tail rotor blade, part number 365A12-0060-01 or 365A12-0070-00, installed, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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