§29.957 Flow between inter-connected tanks

(a) Where tank outlets are interconnected and allow fuel to flow between them due to gravity or flight accelerations, it m ust be im possible for fuel to flow between tanks in quantities great enough to cause overflow from t he t ank vent i n any sustained flight condition. (b) If fuel can be pum ped from one t ank t o another in flight: (1) The design of the vents and t he fuel transfer system must prevent structural dam age to tanks from overfilling; and (2) There m ust be m eans to warn the crew before overflow through the vents occurs.