Is AD 2012-11-05 a recurring Airworthiness Directive?

No — AD 2012-11-05 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2012-11-05 apply to?

AD 2012-11-05 applies to Enstrom — models F-28C, F-28C-2, F-28F, 280C, 280F, 280FX, TH-28, 480. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2012-11-05

one-time

Official AD 2012-11-05 · FR doc 2012-14634 · 2012-06-18 · airframe

Airworthiness Directives; Enstrom Helicopter Corporation Helicopters

What this AD requires

We are superseding an existing airworthiness directive (AD) for Enstrom Helicopter Corporation (Enstrom) Model F-28C, F-28C-2, F- 28F, 280C, 280F, 280FX, TH-28, 480, and 480B helicopters to add another trim relay to the applicability and to revise the modification instructions. This AD is prompted by the discovery that another part- numbered trim relay, inadvertently omitted from the current AD, may contain the same unsafe condition. These actions are intended to prevent failure of the cyclic trim system and subsequent loss of control of the helicopter.

Which aircraft AD 2012-11-05 applies to

MakesEnstrom

ModelsF-28C, F-28C-2, F-28F, 280C, 280F, 280FX, TH-28, 480, 480B, F-28, 280

Part-conditional — KUP14D55-24, KUP14D55-472, M83536/10-015M, M83536/10-024M.

Applies to helicopters with a trim relay, P/N KUP14D55-24, KUP14D55-472, M83536/10-015M, or M83536/10-024M, installed. Does not apply to helicopters with a reversible trim motor, P/N 28-16621 (Ford Motor Company C1AZ-14553A) or P/N AD1R-10 (Signal Electric).

Whether AD 2012-11-05 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 2012-11-05 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.