In conventional twins, juggle weight, speed, bank angle and altitude to achieve maximum single-engine performance.

By Nihad E. Daidzic, Ph.D.

Twin-engine airplanes certified under FAR 23 do not have the same performance guaranteed for transport category airplanes certified under FAR 25. Especially, light twins weighing less than 6000 lbs and have VS0 equal to or less than 61 KCAS are not required to have any positive single-engine performance. Twins weighing more than 6000 lbs and/or having VS0 above 61 KCAS must demonstrate, in still air at 5000 ft, with the inoperative engine feathered, a climb gradient of 1.5 percent (if certified after February 1991), or a rate of climb of 0.027 V2S0—not exactly earth-shaking performance. …