Transport Canada CF-2020-37

Requires inspection of the fuel pipe and fuel pipe bracket installation in the center fuel tank for proper installation and any necessary corrections. Prompted by an instance where, during installation, a fuel pipe bracket assembly on the intermediate rib in the center fuel tank was mislocated, resulting in an offset between the fitting assembly and the refuel defuel tube assembly. This offset could apply a preload on the fuel pipes, reducing their ability to absorb shock or vibration-induced loads, as well as making the tube and clamp more prone to stress corrosion cracking. If not corrected, this condition could lead to failure of the coupling and/or the bracket and p-clamp assembly, resulting in fuel leakage and loss of electrical bonding between fuel pipes. Further, lightning-induced sparking could induce fuel ignition.