here is my view:
in T/O phase you have surely enough fuel in each tank, therefore noo need to open a cross feed valve. why not keeping them segregated? Moreover the cross feed valve is there only for abnormal situations. What will happen if by playing open/close it remain struck open? If later you have a fuel leak situation you are in trouble. Therefore between the question close or open I vote close.
Then in the final approach phase why the need to have a cross feed valve open while in idle and in a phase more less like a glider.
open or close? irrelevant for me better not to touch it . and have one less call in the check list.
Last edited by ZAGORFLY; 3rd Sep 2008 at 13:31.