AUTONOMOUS AUXILIARY POWER UNIT SHUTDOWN AND AUTOMATIC COOLDOWN TIME

System and method for control of an auxiliary power unit -APU- featuring an automatic cooldown time start and an autonomous APU shutdown right after main engines start if the APU is not supplying any power to the aircraft, such as, pneumatic, electrical, etc. The APU control unit will not wait for pilot input to start the cooldown time, it will be automatically initiated. In parallel, the control unit will also set autonomous APU shutdown. Then, after cooldown time, the APU will shut down if the pilot does not take any action.