Is AD 2021-24-12 a recurring Airworthiness Directive?

No — AD 2021-24-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-24-12

Q: Which aircraft does AD 2021-24-12 apply to?

AD 2021-24-12 applies to The Boeing Company — models 777-200, 777-200LR, 777-300, 777-300ER, 777F, 777. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2021-24-12 · FR doc 2021-28133 · 2021-12-28 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by significant changes, including new or more restrictive requirements, made to the airworthiness limitations (AWLs) and Critical Design Configuration Control Limitations (CDCCLs) related to fuel tank ignition prevention, the engine fuel suction feed system, and the nitrogen generation system. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-24-12 applies to

MakesThe Boeing Company

Models777-200, 777-200LR, 777-300, 777-300ER, 777F, 777

Serial-conditional — narrows to serials 1–1609.

Applies to airplanes having line numbers (L/Ns) 1 through 1609 inclusive.

Whether AD 2021-24-12 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 2021-24-12 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.