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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).

IMAG0853.jpg IMAG1603.jpg aero_92.jpg Bus_heat_009.jpg 004.JPG 020a.JPG 011.AVI