Subject to the dangers from exposure to toxic fumes, high pressure air and fluids; fast actuating metal aircraft surfaces such as landing gears, speed brakes, missile doors and flaps; engine noise, heat, blast, intake suction, rotating propellers; explosive munitions; electrical voltage; cartridge actuating devices; liquid oxygen; fire or explosion of aircraft fuels, lubricants, paints and solvents. Must have the ability to instruct lower graded mechanics, military and other personnel in the disassembly and re-assembly of crash damaged engines, transmissions, gearboxes, hydraulic components, and fuel controls sufficient for the exhibit to be returned to its shipping container.