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REGULATIONS Section 3036 Ground Handling A. GENERAL During all operation of the engine, either on the ground or in the air, it must be remembered that rapid cooling may be just as injurious as overheating. Always open and close the throttle gradually and never accelerate rapidly since this procedure may cause detonation. Besides the inherent abuses in rapid cooling and overheating, it should be kept in mind that quick changes in speed impose excessive loads on the engine. Cowl flaps should be full OPEN on R-1830-92 engines. B. TAXIING 1. Carburetor heat may be used for taxiing and pre-take off checks during icing conditions, but the "Cold" position of the carburetor heat control should be used during the actual take off. 2. The tail wheel lock should be on for taxiing except when making turns or when taxiing in proximity to other aircraft or buildings. 3. Taxi slowly to avoid excessive use of the brakes and the danger of nosing over if necessary to stop suddenly. 4. Do not make pivot turns with brake locked on one wheel as this results in excessive wear to the tires. The use of a slight amount of power on the opposite engine will aid in starting a turn. 5. Slow the plane down when approaching a sharp turn, unlock the tail wheel (pull lock control back) and start the turn with the brake. If necessary, assist the brakes in starting the turn by gradually accelerating the outboard engine. When half through the turn start to apply the opposite brake lightly, close the outboard throttle and gradually accelerate the inboard engine sufficiently to help kill the turn. Then when the plane is rolling straight, lock the tail wheel and proceed. Use only sufficient brake to make a smooth turn. Do not make the turn in a series of violent brake applications, as this is extremely jolting to the passengers and severe on the airplane structure. 6. The action of each brake is independent and is controlled by pressure applied to the toe pedals. Although this is a power brake operating as part of the hydraulic system braking action at the wheels exists only as long as pressure is applied to the toe pedals. 1/15/46 DC-3 GROUND OPERATION Page 13