Is AD 2012-17-12 a recurring Airworthiness Directive?

No — AD 2012-17-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2012-17-12 apply to?

AD 2012-17-12 applies to Boeing — models 747-400, 747. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2012-17-12

one-time

Official AD 2012-17-12 · FR doc 2012-21289 · 2012-09-06 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This AD was prompted by reports of water leaking into electrical and electronic equipment in the main equipment center (MEC). This AD requires modifying the floor panels; removing drains; installing floor supports, floor drain trough doublers, drain troughs, and drains; and sealing and taping the floor panels. We are issuing this AD to prevent water from entering the MEC, which could result in an electrical short and potential loss of several functions essential for safe flight.

Which aircraft AD 2012-17-12 applies to

MakesBoeing

Models747-400, 747

Applicability limited to airplanes identified in Boeing Special Attention Service Bulletin 747-25-3586, dated November 12, 2010.

Whether AD 2012-17-12 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 2012-17-12 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.