Is AD 2012-26-10 a recurring Airworthiness Directive?

No — AD 2012-26-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2012-26-10

Q: Which aircraft does AD 2012-26-10 apply to?

AD 2012-26-10 applies to Eurocopter — models SA-365N, SA-365N1, AS-365N2, AS 365 N3, SA-365C, SA-365C1, SA-365C2, SA-366G1. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2012-26-10 · FR doc 2012-31682 · 2013-01-09 · airframe

Airworthiness Directives; Eurocopter France Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for all Eurocopter France (Eurocopter) Model SA-365N, SA-365N1, AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365C, SA-365C1, SA-365C2, and SA-366G1 helicopters. This AD requires inspecting portions of the main gearbox (MGB) for the presence of sealing compound and corrosion. This AD was prompted by reports of corrosion on the main MGB casing lower area between the two servo-control anchoring fitting attachment ribs. An investigation determined that the corrosion was associated with sealing compound on the lower part of the fitting/casing attachment. The actions in this AD are intended to detect corrosion on the MGB casing, which could lead to a crack, failure of the MGB, and subsequent loss of control of the helicopter.

Which aircraft AD 2012-26-10 applies to

MakesEurocopter

ModelsSA-365N, SA-365N1, AS-365N2, AS 365 N3, SA-365C, SA-365C1, SA-365C2, SA-366G1, EC 155B, EC155B1, 365, 366, EC155

Applies due to corrosion on the main gearbox (MGB) casing lower area between the servo-control anchoring ribs; no part-number-specific installation restriction stated.

Whether AD 2012-26-10 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 2012-26-10 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.