Is AD 2021-19-20 a recurring Airworthiness Directive?

No — AD 2021-19-20 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-19-20 apply to?

AD 2021-19-20 applies to Dassault Aviation — models FALCON 7X, FALCON. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-19-20

one-time

Official AD 2021-19-20 · FR doc 2021-20126 · 2021-09-16 · airframe

Airworthiness Directives; Dassault Aviation Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all Dassault Aviation Model FALCON 7X airplanes. This AD was prompted by a report of defects on the piston hole associated with the O<INF>2</INF> saver feature that may prevent efficient deactivation of the O<INF>2</INF> saver function. This AD requires amending the existing airplane flight manual (AFM) to incorporate a check and an operating limitation regarding the O<INF>2</INF> saver function, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. This AD also limits the installation of affected parts under certain conditions. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-19-20 applies to

MakesDassault Aviation

ModelsFALCON 7X, FALCON

Note 1 to paragraph (c): FALCON 7X airplanes with Dassault modification M1000 incorporated are commonly referred to as 'FALCON 8X' as a marketing designation but remain within this AD's applicability.

Whether AD 2021-19-20 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 2021-19-20 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.