In the picture below. I would love to know whether this is only for the purpose of an APU Inlet or Does it serve for other functions like Heat Exchanger Ram Air Inlets?
http://upload.wikimedia.org/wikipedi..._APU_Inlet.jpg
I would also love to know where the Primary Heat Exchanger Inlets are on this plane?
http://upload.wikimedia.org/wikipedi...okker_F_27.jpg
This is a picture of the Rolls Royce Dart Engines and was wondering about the need for those movable doors/openings? The Exhaust is pretty Visible. Not Sure though which are for cooling etc..
I would appreciate detailed answers or clear resources to the topic.
Thank you for your time.