Is AD 2012-08-18 a recurring Airworthiness Directive?

No — AD 2012-08-18 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2012-08-18 apply to?

AD 2012-08-18 applies to Turbomeca S.A. — models Arriel 2B, Arriel 2B1, Arriel. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2012-08-18

one-time

Official AD 2012-08-18 · FR doc 2012-9789 · 2012-04-25 · turboshaft engine

Airworthiness Directives; Turbomeca S.A. Turboshaft Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 2B and 2B1 turboshaft engines. This AD was prompted by the discovery of non-conformities of certain power turbine (PT) blade fir-tree roots. This AD requires removing the affected PT blades from service on or before reaching a new reduced life limit for those certain PT blades. We are issuing this AD to prevent PT blade rupture, which could result in an uncommanded in-flight engine shutdown, forced autorotation landing, or accident.

Which aircraft AD 2012-08-18 applies to

MakesTurbomeca S.A.

ModelsArriel 2B, Arriel 2B1, Arriel

Serial-conditional — narrows to serials 102782–120230, 120293–120390.

Part-conditional — 2 292 81 A01 0.

Applies only to engines with at least one installed power turbine (PT) blade, P/N 2 292 81 A01 0, within the specified serial number ranges.

Whether AD 2012-08-18 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 2012-08-18 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.