The 777 has 2 engines. True or false? False. The engine has THREE engines. The APU, located in the tail of the aircraft, can provide electrical power and bleed air for various flight operations, especially on the ground.
This system interacts directly with the electrical and pneumatic system. As a result, you need to know exactly how.
Being the amazing aircraft it is, much of the APU operation is automated and totally outside the pilots control. Other than starting up, and shutting down, the APU is monitored and protected automatically.
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