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Question:

where does it intake air?

You know how the 737 has two visible engines under the wing and one hidden in the back of the plane underneith the rudder (as well as most other aircraft)? Well, where does it intake air? And also, what is it called?

Answer:

All commercial aircraft have the small engine in the back. It is called an APU (auxilary Power Unit) It provides electrical and pneumatic power while the main engines are not running. It has an intake located that opens up during the apu start cycle and closes when the apu is shut down. The locations vary slightly with the model of the aircraft.
You are talking about the APU(auxiliary power unit) it is used to supply electrical power,air (to start the engines and to run the pack bays(heat and air-conditioning),anti-ice functions and to pressurize the airplane on the ground for maintenance purposes.The apu air intake is on the right aft side of the airplanejust behind the right rear service door.Some apu's on the 737 are air rated(can operate while the plane is flying)you can tell this if it has a vortex generator in the intake( a small triangular shaped airfoil),,believe it or not the apu on these airplanes can supply a small amount of thrust.
The one under the Rudder is called an APU --- Auxiliary Power Unit. It is used as an auxiliary source of either electrical power or pneumatic (air) for air conditioning for the cabin areas. Air intake comes from an inlet air door on the right side of the aircraft. Additional comment: The APU is NOT used or rated against the airframe for propulsion. It can be used when the aircraft is airborne as an auxilary means, but altitude restrictions and other procedures would take affect. WHO IS THE SCREW-BALL, NUT CASE RESPONDING TO GOOD ANSWERS FROM OTHERS WITH NEGATIVE RATINGS? WHO-EVER YOU ARE, YOU ARE AN ENVIOUS MORON!

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