PPRuNe Forums - View Single Post - A320 fuel/tank feed at engine start
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Old 6th Jun 2021, 20:37
  #17 (permalink)  
8314
 
Join Date: May 2010
Location: Austria
Age: 44
Posts: 34
Logic 1 says ctr pumps stop with slats and at least 2min since engine start
Logic 2 says ctr pumps stop with full inner tanks until 500kg are used to prevent spillage from the IDG return. ( xfer valves (jet pump a/c) clsd until 250kg gone)
Fuel return valve only opens above a certain oil temp threshold (73C?) but seems to have no connection with pump logic, so on ground with fuel in ctr tank wings should always be full, so ctr pumps always crossline green? Do they run at engine start for self test?
Getting more confuddled the longer I look at it. 🤔
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