Is AD 2021-03-10 a recurring Airworthiness Directive?

No — AD 2021-03-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-03-10 apply to?

AD 2021-03-10 applies to Bombardier, Inc. — models BD-100-1A10, BD-100. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-03-10

one-time

Official AD 2021-03-10 · FR doc 2021-03600 · 2021-02-24 · airframe

Airworthiness Directives; Bombardier, Inc., Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by reports of failure of a certain fire detection and extinguishing (FIREX) control unit. This AD requires replacing FIREX control units having a certain part number. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-03-10 applies to

MakesBombardier, Inc.

ModelsBD-100-1A10, BD-100

Serial-conditional — narrows to serials 20003–20500, 20501–20669.

Part-conditional — 474112-2.

Applies only to airplanes fitted with fire detection and extinguishing (FIREX) control unit part number 474112-2.

Whether AD 2021-03-10 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 2021-03-10 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.