Is AD 2010-20-12 a recurring Airworthiness Directive?

No — AD 2010-20-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2010-20-12 apply to?

AD 2010-20-12 applies to Boeing — models 747-400, 747-400D, 747-400F, 747. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2010-20-12

one-time

Official AD 2010-20-12 · FR doc 2010-24169 · 2010-10-01 · airframe

Airworthiness Directives; The Boeing Company Model 747-400, 747-400D, and 747-400F Series Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for Model 747-400, 747-400D, and 747-400F series airplanes. This AD requires installing a hot short protector (HSP) for the fuel quantity indicating system (FQIS) of the center fuel tank and, for certain airplanes, the horizontal stabilizer fuel tank. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent an electrical hot short from a source outside the FQIS to the densitometer wiring from causing failure of the FQIS densitometer resistors, which could result in an ignition source inside the center or horizontal stabilizer fuel tanks. An ignition source, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. This AD is effective November 5, 2010. The Director of the Federal Register approved the incorporation by reference of certain publications listed in the AD as of November 5, 2010.

Which aircraft AD 2010-20-12 applies to

MakesBoeing

Models747-400, 747-400D, 747-400F, 747

Applies to airplanes as identified in Boeing Service Bulletin 747-28A2266, Revision 1, dated December 10, 2009, and Boeing Alert Service Bulletin 747-28A2267, dated December 18, 2008.

Whether AD 2010-20-12 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 2010-20-12 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.