"there is nothing to pump/suck the fuel out of the failed side tank once it reaches the connecting flange."
"I think everyone is just wondering how you access the fuel from the opposite side in the event of OEI."
On the 139, crossfeed is only controlling which engine the fuel is directed to, not which tank. Below the interconnect fuel is distributed equally by gravity. When fuel reaches a level below the interconnect, the crossfeed valve has to be open to deliver fuel to the opposite engine. It is fed up through the lines, not via the interconnect flange. It needs the boost pump on the shut down/failed side to match the input pressure on the good engine side (which won’t have had its pump switched off as part of a shut down procedure). If the pump is failed on the shut down side, switching the other one off should solve the pressure imbalance.
If it’s a similar design on the 169, without boost pumps there should be no significant pressure disparity, so just make sure that crossfeed is open (as you said Outwest).
TT
Last edited by Torquetalk; 11th Feb 2016 at 08:14.