Is AD 2021-24-21 a recurring Airworthiness Directive?

No — AD 2021-24-21 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-24-21 apply to?

AD 2021-24-21 applies to Embraer S.A. — models EMB-500, EMB-505. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-24-21

one-time

Official AD 2021-24-21 · FR doc 2021-27511 · 2021-12-21 · airframe

Airworthiness Directives; Embraer S.A. Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Embraer S.A. Model EMB-500 and EMB-505 airplanes. This AD was prompted by a report that the operational envelope does not contain airspeed limitations and procedures for operating the airplane at static air temperatures below -54 [deg]C. This AD requires revising the airplane flight manual (AFM) to incorporate new and revised airspeed limitations and procedures. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-24-21 applies to

MakesEmbraer S.A.

ModelsEMB-500, EMB-505

Applies only when Model PW617F-E or PW617F1-E engines are installed (EMB-500 airplanes) or Model PW535E engines are installed (EMB-505 airplanes).

Whether AD 2021-24-21 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 2021-24-21 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.