AD 2021-17-07 Requires Inspecting For Damage Of The Left And Right MF Fuel Line Assemblies

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Model BD-500-1A10 and BD-500-1A11 airplanes.

This AD was prompted by the potential for the flexible hose assembly of the fuel motive flow (MF), installed between the pylon and wing, to be installed twisted in the shroud, which can restrict the flow of fuel for the MF and cause fuel imbalance and damage to the shroud assembly. This AD requires inspecting for damage of the left and right MF fuel line assemblies (including the flexible-hose and shroud assemblies), and replacing damaged parts, as specified in a Transport Canada Civil Aviation (TCCA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products. This AD becomes effective August 30, 2021.

Supplementary Information: TCCA, which is the aviation authority for Canada, has issued TCCA AD CF-2021-09, dated March 11, 2021 (TCCA AD CF-2021-09) (also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI), to correct an unsafe condition for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes.

This AD was prompted by the determination that a new configuration of the pylon-to-wing area MF flexible fuel line assembly was introduced without revision or modification to the installation procedure, potentially resulting in a twisted MF flexible fuel line in the shroud. This can restrict the flow of fuel of the MF, which can cause fuel imbalance and possible damage including abrasion to the shroud assembly. The FAA is issuing this AD to address this condition, which could result in the consequent abrasion of the fuel line and a possible fuel leak; as a result, the electrical harness connectors in the wing area could be a potential ignition source and pose a risk of fire. See the MCAI for additional background information.

FMI: www.regulations.gov