Federal Register #2026-05699

This opportunity concerns a proposed FAA airworthiness directive for Airbus Canada BD-500-1A10 and BD-500-1A11 aircraft, addressing safety issues with pressure regulating shutoff valves (PRSOVs): - Government Buyer: - Federal Aviation Administration (FAA), Department of Transportation - OEMs and Vendors: - Airbus Canada Limited Partnership (primary aircraft OEM) - C Series Aircraft Limited Partnership (CSALP) - Bombardier, Inc. (previous certification holder) - Pratt & Whitney (engine OEM, referenced for related directives) - Transport Canada (regulatory authority) - Products/Services Requested: - Replacement of PRSOVs with redesigned parts (Part Number: 70115C010001) - Replacement of PRSOV precooler sense hose assembly (Part Number: 999D0004515) - Revision of airplane flight manual (AFM) to include new engine shutdown procedures for persistent BLEED LEAK cautions - Prohibition of operation in certain icing conditions when only one PRSOV is operative under specific MEL provisions - Unique/Notable Requirements: - Applies to U.S.-registered Airbus Canada BD-500-1A10 and BD-500-1A11 aircraft - Addresses multiple in-service failures of PRSOVs that could lead to unsafe conditions, increased pilot workload, or loss of safe flight and landing - Compliance with both FAA and Transport Canada directives is required - Locations: - FAA Airworthiness Products Section, Operational Safety Branch, Des Moines, WA - Transport Canada National Aircraft Certification, Nepean, Ontario, Canada

The FAA proposes a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes due to multiple in-service failures of pressure regulating shutoff valves (PRSOVs). The AD would require revising the airplane flight manual to include engine shutdown procedures when the BLEED LEAK caution message persists, prohibit operation in certain icing conditions under specific MEL provisions, and mandate replacement of affected PRSOVs with improved versions. This action aims to address the unsafe condition that could lead to damage to surrounding structures and systems, increasing pilot workload or resulting in loss of safe flight and landing. Comments are due by May 8, 2026.