Okay DV,
War story time. On many Mk's of Canberra there is a fire bottle in the rear fuselage accessed via the back hatch, lots of dzus fasteners to undo just to check a fire bottle hasn't gone off. Some engineers didn't bother checking it. One day, an engineer did check it and found the fire bottle to be discharged. On investigation, it was discovered that the fire bottle head had been wired incorrectly and that it had fired the first time power had been applied to the aircraft. OC 100 Sqn wanted every single engineer who had serviced the aircraft to be Tech Charged. The Flt Sgt began proceedings and quickly discovered that OC 100 Sqn had himself taken the aircraft on a land away and was as slack as his airmen. Case closed, swept under the carpet, due to Trumpage.