Four trucks were heavily strafed, probably rendering them completely unserviceable. Three of the escorts had defective sonar and three had unserviceable radar. M (unserviceable) and all four serviceable Do 17Zs. Specialists can rebuild the unserviceable Clansman NICAD battery. The trawler "Dorothy Gray" altered course and rammed the periscope, rendering it unserviceable. Stations have closed temporarily for safety reasons when escalators have been unserviceable. The United States House Committee on Oversight and Government Reform ruled the ammunition "unserviceable". Any unserviceable or missing items must be reported and rectified prior to take-off. Damage to the returning "Gruppe" aircraft meant the entire unit was unserviceable. There were aircraft and another reserve, of which operational and unserviceable. At one point during the month, they had fourteen aircraft simultaneously unserviceable with engine failures. During the war 73 were lost in action and 31 were scrapped after becoming unserviceable. However, they believed that many Katangese aircraft were unserviceable. Travers' vehicle had eleven bullet holes, with a shock absorber destroyed and the brakes unserviceable. As of 2014, a significant proportion of Germany's military aircraft was reported to be unserviceable.