In the A320 family series FCOM under the special operations procedure chapter it is mentioned that we have to check the fuel x feed on ground before departing.
Any specific reason why we only check it before departing for ETOPS flights?
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The main reason to check the Fuel-X-FEED on the ground before the flight is to allow the pilots to use the total fuel quantity on both wings in case of a single-engine failure during flying in ETOPS. (Due to engine-out scenario you may not be able to feed one engine by both fuel tanks without the FUEL-X-FEED Valve)
in addition to this, the Fuel-X-FEED in the A320 MEL is a NO DISPATCH item by means you can't depart without and that reason tracks back to the EASA Requirments listed in AMC-20 AMENDMENT - 7 (APPENDIX 4 - FLIGHT PREPARATION AND IN-FLIGHT PROCEDURES):
(11) Fuel system
(i) The aeroplane fuel system should provide fuel pressure and flow to the engine(s) in accordance with CS 25.951 and 25.955 for any fuel pump power supply failure condition not shown to be extremely improbable.
(ii) The fuel necessary to complete the ETOPS mission or during a diversion should be available to the operating engine(s) under any failure condition, other then fuel boost pump failures, not shown to be extremely improbable2 (e.g. crossfeed valve failures, automatic fuel management system failures).