Is AD 2021-05583 a recurring Airworthiness Directive?

Yes — AD 2021-05583 requires a repetitive inspection every 4000 hours. Next-due depends on the aircraft's time in service.

Airworthiness Directive 2021-05583

Q: Which aircraft does AD 2021-05583 apply to?

AD 2021-05583 applies to Airbus Canada Limited Partnership — models BD-500-1A10, BD-500-1A11, BD-500. Serial/part conditions may narrow it to specific aircraft.

recurring

AD 2021-05583 · 2021-03-22 · airframe

Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by a report that threaded fuel couplings were incorrectly installed at final assembly and in service. This AD requires repetitive functional tests of the auxiliary power unit (APU) fuel feed line shroud, a general visual inspection of the APU fuel feed line shroud for any loose couplings; and tightening any loose couplings, which would terminate the repetitive functional tests. The FAA is issuing this AD to address the unsafe condition on these products.

Repetitive inspection. Re-inspect every 4000 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2021-05583 applies to

MakesAirbus Canada Limited Partnership

ModelsBD-500-1A10, BD-500-1A11, BD-500

Serial-conditional — narrows to serials 50010–50018, 50020–50041, 55003–55016, 55018–55054, 55056–55056.

Type certificate previously held by C Series Aircraft Limited Partnership (CSALP) and Bombardier, Inc. Model BD-500-1A10 airplanes: serial numbers 50010-50018 and 50020-50041. Model BD-500-1A11 airplanes: serial numbers 55003-55016, 55018-55054, and 55056.

Whether AD 2021-05583 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 2021-05583 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.