Is AD 2012-10-53 a recurring Airworthiness Directive?

No — AD 2012-10-53 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2012-10-53 apply to?

AD 2012-10-53 applies to Eurocopter — models EC135 P1, EC135 P2, EC135 P2+, EC135 T1, EC135 T2, EC135 T2+, EC135. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2012-10-53

one-time

Official AD 2012-10-53 · FR doc 2012-28100 · 2012-11-20 · airframe

Airworthiness Directives; Eurocopter Deutschland GmbH Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Eurocopter Deutschland GmbH (ECD) Model EC135 P1, EC135 P2, EC135 P2+, EC135 T1, EC135 T2, and EC135 T2+ helicopters. This is the Federal Register publication of an Emergency AD (EAD) that was previously sent to all known owners and operators of these helicopters. That EAD superseded an earlier related EAD. This AD requires, before further flight and at specified intervals, checking and inspecting the upper and lower main rotor hub (MRH) shaft flanges for a crack, and inspecting the lower hub-shaft flange bolt attachment areas for a crack. This AD is prompted by three reported incidents of cracking on the lower hub-shaft flanges of EC135 model helicopters. These actions are intended to detect a crack on the hub-shaft flange, which if not corrected could result in failure of the MRH and subsequent loss of control of the helicopter.

Which aircraft AD 2012-10-53 applies to

MakesEurocopter

ModelsEC135 P1, EC135 P2, EC135 P2+, EC135 T1, EC135 T2, EC135 T2+, EC135

Part-conditional — L623M1006101, L623M1206101, L623M1006102, L623M1206102, L623M1006103, L623M1206103.

Applies only when a main rotor hub (MRH) shaft with one of the listed part numbers is installed.

Whether AD 2012-10-53 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 2012-10-53 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.