Is AD 2021-23-11 a recurring Airworthiness Directive?

No — AD 2021-23-11 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-23-11

Q: Which aircraft does AD 2021-23-11 apply to?

AD 2021-23-11 applies to Learjet Inc. — models Learjet 40, Learjet 45, Learjet 70, Learjet 75, Model 45. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2021-23-11 · FR doc 2021-26331 · 2021-12-06 · airframe

Airworthiness Directives; Learjet Inc. Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Learjet Inc. Model 45 airplanes. This AD was prompted by a report of a fuel leak due to a cracked fuel line between the engine fuel control and the engine fuel flow meter. This AD requires replacing the existing fuel flow meter bracket assembly with a redesigned bracket assembly and reporting information to the FAA. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-23-11 applies to

MakesLearjet Inc.

ModelsLearjet 40, Learjet 45, Learjet 70, Learjet 75, Model 45

Serial-conditional — narrows to serials 45-002–45-556, 45-2001–45-2146.

Whether AD 2021-23-11 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 2021-23-11 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.