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Here the flapper is opened all of the way so all of the heated air goes into the Bus interior.  This system is used by all the Types of engines (Type I/II, III, & IV).

Here the flapper is opened all of the way so all of the heated air goes into the Bus interior. This system is used by all the Types of engines (Type I/II, III, & IV).

IMAG1651.jpg aero_09.jpg IMAG1677.jpg Bus_heat_009.jpg aero_01.jpg HID_057.jpg 039.JPG