Probably not the answer that you wanted.... but here it is anyway.
Sec. 25.1001 Fuel jettisoning system.
(a) A fuel jettisoning system must be installed on each airplane unless it
is shown that the airplane meets the climb requirements of Secs. 25.119 and
25.121(d) at maximum takeoff weight, less the actual or computed weight of
fuel necessary for a 15-minute flight comprised of a takeoff, go-around, and
landing at the airport of departure with the airplane configuration, speed,
power, and thrust the same as that used in meeting the applicable takeoff,
approach, and landing climb performance requirements of this part.