Hi,
If the engines are not fed by the same fuel tank is a requirement for certification (according to Airbus reply), it will be nice if someone can post this requirement/regulation (EASA or FAA).
a) If there is such requirement for certification why Boeing is not complying with this regulation?
I think the answer can be found in this link. FAR 23.955 - Fuel Flow
Scroll down to Section 23.955 (f), Turbine engine fuel systems
I don't think this link provide an answer to the question. In addition I think Part 23 does not apply to A320. Part 25 applies to A320.
b) I am wondering if engines are not fed by the same tank during take off in other Airbus aircraft.
Feedback appreciated.