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RIP.The same thing happened at USS Midway in Vietnam War when a Phantom F5 launched a missile while it was still on the ground due to short circuit.Faulty jet gun kills one at PAF base
LAHORE: A Pakistan Air Force (PAF) technician was killed and five others were injured when a gun of a fighter jet went off accidentally at the PAF Masroor base in Karachi on Friday, a private TV channel reported. According to the PAF spokesman, the gun shot fires due to the short-circuiting in the jet when it was being overhauled and refuelled in a bunker.
Daily Times - Leading News Resource of Pakistan
The weight-on-wheels (WoW) switch removes/enables electrical power on certain systems. Pitot heat is 'remove', meaning electrical power to the heater element in the pitot and angle-of-attack probes are removed the moment aircraft weight is fully on the landing gear. Pitot heat electrical power is enabled when weight is off wheels...According to the National Transportation Safety Board (NTSB), maintenance performed by General Dynamics Aviation Services personnel in Palm Beach, Fla., failed to remove tongue depressors that were being used to disable the weighton-wheels (WOW) switch of a Gulfstream V on jacks. That practice led to a hard landing causing substantial damage to the airplane, according to the NTSB's final report of the Feb. 14, 2002, incident (NTSB identification number MIA02lA060). Shortly after departure, the pilot requested a return for landing because the landing gear would not retract. As the jet flared for landing and the crew pulled the power levers back to idle, the spoilers deployed because of the disabled WOW switch.
The system switch is essentially a heavy duty mechanical device NOT easily depressed by a person.pitot heat and other systems safe if mistakenly left on after landing, e.g., via an interlock with the weight on wheels sensor or a reduction in power when overheating (better yet: the Garmin knows when the airplane is flying because it turns the transponder on and off automatically and also runs a flight timer; the Garmin also knows the outside temperature because it displays it; why can't the Garmin system turn on the pitot heat if the airplane is flying and temps are below 10C?)