How a jet engine is started?
With a little push from the auxiliary power unit… The compressed air passes through a small turbine on the outside of the engine, causing it to spin. Attached to the turbine is a shaft which is joined by gears to the main engine shaft, and that begins spinning as well.
How does a plane start?
The electric motor spins the main shaft until there is enough air blowing through the compressor and the combustion chamber to light the engine. Fuel starts flowing and an igniter similar to a spark plug ignites the fuel. Then fuel flow is increased to spin the engine up to its operating speed.
Can an aircraft fly without APU?
Without an APU an aircraft would depend on GSE only for starting one engine with pressurized ground supplied air. Aircraft are allowed in general to fly without an APU. Exceptions are flights with two-engined aircraft and long routes over water or terrain without an alternate airport – so called ETOPS flights.
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How long does it take for an APU to start?
In that case, the APU will be started by the air-driven motor rather than the electric motor, with pressurized air supplied by the still-running main engines. EDIT to answer question in comment: Depending on size, the APU will take something between 30seconds and 2 minutes to start.
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What is the main function of an APU?
The other main function of the APU is to start the main engines. As with ground power, this could also be achieved using a ground-based supply. Just as the APU is started using battery power to turn the blades, the blades of the main engines must be turning before they can be started.