Is AD 2026-04278 a recurring Airworthiness Directive?

No — AD 2026-04278 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2026-04278 apply to?

AD 2026-04278 applies to Airbus Canada Limited Partnership — models BD-500-1A10, BD-500-1A11, BD-500. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2026-04278

one-time

AD 2026-04278 · 2026-03-04 · 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 reports of certain fuel transfer float valves failing in the closed position, preventing normal fuel transfer between the center and wing fuel tanks. This AD requires replacing the existing fuel transfer float valves on airplanes approved for extended-range twin-engine operation performance standards (ETOPS). The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2026-04278 applies to

MakesAirbus Canada Limited Partnership

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

Applies to airplanes as identified in Transport Canada AD CF-2024-37, dated November 4, 2024.

Whether AD 2026-04278 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 2026-04278 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.