Is AD 2012-23-05 a recurring Airworthiness Directive?

No — AD 2012-23-05 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2012-23-05 apply to?

AD 2012-23-05 applies to Mbb — models MBB-BK117 C-2, BK117. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2012-23-05

one-time

Official AD 2012-23-05 · FR doc 2012-28039 · 2012-11-20 · airframe

Airworthiness Directives; Eurocopter Deutschland Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for all Eurocopter Deutschland GmbH (ECD) Model MBB-BK117 C-2 helicopters with certain Generator Control Units (GCU) installed. This AD requires replacing the GCUs. This AD was prompted by reports of internal short circuits in certain GCUs. These actions are intended to prevent a short circuit, which could result in a loss of electrical generating power, loss of systems required for continued safe flight and landing, and subsequent loss of control of the helicopter.

Which aircraft AD 2012-23-05 applies to

MakesMbb

ModelsMBB-BK117 C-2, BK117

Part-conditional — 51530-021EI.

Applies only when generator control unit (GCU) P/N 51530-021EI with no modification, MOD A, or MOD B, is installed.

Whether AD 2012-23-05 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 2012-23-05 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.