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Old 27th Feb 2008, 17:50
  #462 (permalink)  
Jetdoc
 
Join Date: Jun 2006
Location: Canada
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B777fly

From the B777 AMM
A discharge check valve is installed in the pump housing for each fuel boost pump, override/jettison pump and jettison pump. The discharge check valve prevents the flow of fuel back through the applicable fuel pump.

I wish I could show you a good schematic. The B777 AMM is not like the previous AMMs that Boeing has produced and really good schematics are lacking.
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