For normal, utility, and acrobatic category multiengine jets of more than 6,000 pounds maximum weight and commuter category airplanes, the accelerate-stop distance must be determined as follows:
(a) The accelerate-stop distance is the sum of the distances necessary to--
(1) Accelerate the airplane from a standing start to VEF with all engines operating;
(2) Accelerate the airplane from VEF to V1, assuming the critical engine fails at VEF; and
(3) Come to a full stop from the point at which V1 is reached.
(b) Means other than wheel brakes may be used to determine the accelerate-stop distances if that means--
(1) Is safe and reliable;
(2) Is used so that consistent results can be expected under normal operating conditions; and
(3) Is such that exceptional skill is not required to control the airplane. [Amdt. 23-34, 52 FR 1826, Jan. 15, 1987, as amended by Amdt. 23-50, 61 FR 5185, Feb. 9, 1996, as amended by Amdt. 23-62, 76 FR 75753, Dec. 2, 2011]