AD 2011-18-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Eurocopter France (ECF) Model AS350B, B1, B2, B3, BA, and D; and AS355E, F, F1, F2, and N Helicopters |
Unsafe Condition
Cracks have been discovered in the spar of the upper fin on Model AS355N helicopters, which could lead to failure of a spar, loss of a fin, a separated fin hitting a rotor, and subsequent loss of control of a helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the upper and lower fin attachment to prevent failure of a spar, loss of a fin, and subsequent loss of control of a helicopter.
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 (ECF) Model AS350B, B1, B2, B3, BA, and D; and 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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