AD 2012-17-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | France | Airworthiness Directives; Eurocopter France Helicopters |
Unsafe Condition
A cracked main rotor mast nut could result in failure of the rotor mast 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
Remove mast nut part number 360A31-1020-20 and replace with an airworthy mast nut that has a different part number, depending on the helicopter model.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified time frame based on time-in-service (TIS) or within a set number of hours TIS, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France Model SA-365N, SA-365N1, SA-366G1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 helicopters with mast nut part number 360A31-1020-20 installed.
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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