Abstract: Electronically controlled locks are typical restrictive components in large aircraft cargo systems, it is installed in the side rails, the container pallets / platforms that meet the corresponding interface of the aircraft are restrained along the course in the cargo hold and cargo bridge. This research starts with the failure phenomenon to formulate the fault tree, determine the troubleshooting plan according to the fault tree, analyze and exclude one by one, finally the main cause of the ablation of the matching motor of the drive assembly is determined, and through the case study, in order to provide reference for relevant troubleshooting.