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Old 7th Jul 2019, 17:20
  #28 (permalink)  
Join Date: Nov 2004
Location: North America
Age: 75
Posts: 173
B2N2 is clearly referring to 747 operations. Opening the 747 Classic APU inlet door immediately after landing and in some cases on approach was a common practice especially after long haul flights to improve APU starting. The 747 Classic APU is not used for any emergency or back up functions so much of the chatter above is irrelevant. In fact the 747 Classic APU is not certified for in flight starting if the ram scoop on the inlet door is deleted. Most operators deleted the ram scoop per Boeing SB to eliminate a small drag penalty. There is a placard on aircraft with the scoop deleted that reads "APU IN FLIGHT STARTING PROHIBITED. In Flight Operation After Ground Start Allowed".
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