Is AD 2021-12-13 a recurring Airworthiness Directive?

No — AD 2021-12-13 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-12-13 apply to?

AD 2021-12-13 applies to The Boeing Company — models 737-8, 737-9, 737. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-12-13

one-time

Official AD 2021-12-13 · FR doc 2021-13125 · 2021-06-24 · 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 737-8 and 737-9 airplanes. This AD was prompted by a report that during refueling of the right main tank, if there is a failure of the automatic shutoff system, the refueling panel does not provide the required indication that the automatic shutoff has failed. This AD requires installing a new fuel quantity processor unit (FQPU) and doing an FQPU software check. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-12-13 applies to

MakesThe Boeing Company

Models737-8, 737-9, 737

Applicability limited to airplanes identified in Boeing Special Attention Requirements Bulletin 737-28-1363 RB, dated June 2, 2020.

Whether AD 2021-12-13 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 2021-12-13 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.