Yes, and the APU is the Auxiliary Power Unit. Essentially a small gas turbine engine that generally resides in the tail section of the aircraft to provide power to the electrics on the ground when the main engines are off (the brief flickering of the cabin lights you often see when taxi’ing for departure is the switch from APU to main power). It also provides compressed air to start the engines.
APU exhaust from the rear of the aircraft is the highly annoying cause of heat haze on many a taxi photo!
Paul
Thank you for that information Paul very useful 😎 I know what you mean now when the lights flicker when start taxing , I always thought thats when the engines are starting like when you start a car and the radio goes off.
Thank you for info I will now remember that 😀
All the best
James
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