Is AD 2012-17-02 a recurring Airworthiness Directive?

No — AD 2012-17-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2012-17-02

Q: Which aircraft does AD 2012-17-02 apply to?

AD 2012-17-02 applies to Eurocopter France — models SA-365N, SA-365N1, SA-366G1, AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2012-17-02 · FR doc 2012-21262 · 2012-09-05 · airframe

Airworthiness Directives; Eurocopter France Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for all Eurocopter France (EC) Model SA-365N, SA-365N1, SA-366G1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 helicopters. This AD was prompted by the discovery of a cracked main rotor mast nut. This condition, if not corrected, could lead to complete failure of the mast nut, resulting in failure of the rotor mast and loss of control of the helicopter. This AD will require replacing the main rotor mast nut with an airworthy main rotor mast nut to prevent this scenario.

Which aircraft AD 2012-17-02 applies to

MakesEurocopter France

ModelsSA-365N, SA-365N1, SA-366G1, AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365, SA-366, AS-365, EC155

Part-conditional — 360A31-1020-20.

Applies only when main rotor mast nut P/N 360A31-1020-20 is installed.

Whether AD 2012-17-02 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2012-17-02 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.