Fuel Distribution – Motive Flow Fuel-feed Tubes Damaged at Bonding Clamp and Clamp Block Locations Inside the Fuel Tank
Superseded. A newer version replaces this document.
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform an initial operational check of the gravity cross flow shut-off valve within 930 flight hours from January 4, 2023, and repeat this check every 930 flight hours thereafter. For specified serial number groups, an inspection and necessary rectification of the motive flow fuel-feed tubes must be completed within 9800 flight hours from the effective date. Compliance with the referenced ACLP Service Bulletins is mandatory.
Summary
Canadian Airworthiness Directive CF-2022-70 addresses fuel distribution issues on Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 aircraft models. It mandates inspections and operational checks of motive flow fuel-feed tubes inside the fuel tank to prevent fuel imbalance caused by mechanical wear at bonding clamp and clamp block locations. This directive applies to specific serial numbers starting from 50001 for BD-500-1A10 and 55001 for BD-500-1A11 models.
What changed
This new Airworthiness Directive introduces mandatory repeated operational checks of the gravity cross flow shut-off valve and inspections of motive flow fuel-feed tubes for preload conditions. It requires compliance with ACLP Service Bulletins BD500-282012 and BD500-282015, including rectification actions where necessary. The directive is interim and may be followed by further regulatory actions.
Why it matters
The directive is critical for maintaining safe fuel distribution and preventing fuel imbalance during flight, which can increase crew workload and reduce aircraft functional capabilities. Operators and maintenance teams must ensure compliance to avoid in-flight fuel system failures. It also highlights the need for ongoing monitoring and corrective maintenance to address wear damage in fuel-feed tubes.
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