Text in force at 23-63: from 23-50, effective 11 Mar 1996.
[The maximum horizontal distance traveled in still air, in nautical miles, per 1,000 feet of altitude lost in a glide, and the speed necessary to achieve this must be determined with the engine inoperative, its propeller in the minimum drag position, and landing gear and wing flaps in the most favorable available position.]
61 FR 5187 · Source