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AD 2026-04278

Published 2026-03-04 · 5 models · 60 US-registered tails affected · Federal Register

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

Abstract

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.

Applicability · by US fleet size

  • FLEET 2 28 tails
  • C SERIES BD-500-1A10 14 tails
  • FLEET 1 14 tails
  • FLEET 9 3 tails
  • UNKNOWN UNKNOWN 1 tails

Federal Register text

Verbatim; the Federal Register publication is the legally binding document. Cite: 91 FR 10510. View on Federal Register ↗

[Federal Register Volume 91, Number 42 (Wednesday, March 4, 2026)] [Rules and Regulations] [Pages 10510-10513] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2026-04278]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-2545; Project Identifier MCAI-2024-00657-T; Amendment 39-23264; AD 2026-04-04] RIN 2120-AA64

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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: 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.

DATES: This AD is effective April 8, 2026. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of April 8, 2026.