Is AD 2021-21-10 a recurring Airworthiness Directive?

No — AD 2021-21-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-21-10 apply to?

AD 2021-21-10 applies to Pacific Aerospace — models 750XL. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-21-10

one-time

Official AD 2021-21-10 · FR doc 2021-24084 · 2021-11-05 · airframe

Airworthiness Directives; Pacific Aerospace Limited Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Pacific Aerospace Limited Model 750XL airplanes. This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as chafing damage in the port wing skin caused by the fuel system finger filters. This AD requires inspecting the wing internal skin for chafing and taking any necessary corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-21-10 applies to

MakesPacific Aerospace

Models750XL

Serial-conditional — narrows to serials 100–205, 207–213, 8001–8001.

Whether AD 2021-21-10 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 2021-21-10 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.