Additional tests.

CFR · 2024-01-01 · US · Title 14

(a) Any additional dynamic, endurance, and operational tests, and vibratory investigations necessary to determine that the rotor drive mechanism is safe, must be performed. (b) If turbine engine torque output to the transmission can exceed the highest engine or transmission torque limit, and that output is not directly controlled by the pilot under normal operating conditions (such as where the primary engine power control is accomplished through the flight control), the following test must be made: (1) Under conditions associated with all engines operating, make 200 applications, for 10 seconds each, of torque that is at least equal to the lesser of— (i) The maximum torque used in meeting § 29.923 plus 10 percent; or (ii) The maximum torque attainable under probable operating conditions, assuming that torque limiting devices, if any, function properly. (2) For multiengine rotorcraft under conditions associated with each engine, in turn, becoming inoperative, apply to (c) (1) (2) (d) (1) Overspeed runs must be alternated with stabilizing runs of from 1 to 5 minutes duration each at 60 to 80 percent of maximum continuous speed. (2) Acceleration and deceleration must be accomplished in a period not longer than 10 seconds (except where maximum engine acceleration rate will require more than 10 seconds), and the time for changing speeds may not be deducted from the specified time for the overspeed runs. (3) Overspeed runs must be made with the rotors in the flattest pitch for smo

official document · source cfr-2024 · id 14:§ 29.927