CS 22.955 Fuel flow
CAA ORS9 Decision No. 1
(a) Gravity systems. The fuel flow rate for gravity systems (main and reserve supply) must be 150% of the take-off fuel consumption of the engine.
(b) Pump systems. The fuel flow rate for each pump system (main and reserve supply) must be 125% of the take-off fuel consumption of the engine at the maximum power established for take-off .