Subject to the dangers from exposure to toxic fumes, dust, dirt, grease, lubricants, points, solvents, high pressure air and fluids; fast actuating aircraft surfaces such as speed brakes, flaps, and landing gear; engine noise, heat blast, and intake suction; rotating propellers; explosive munitions; electrical voltage; cartridge actuating devices; liquid oxygen; fire or explosion of aircraft fuels, etc. 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.