TM 1-1520-240-107A-6-1SECTION VI. TAKEOFF7A-6-1. Description.The takeoff chart, figure 7A-6-1, defines distances re-quired to clear obstacles of 50 feet, 100 feet, 150 feet,and 200feet based upon maximum hover height capabil-ity and true airspeed. The procedure for takeoff is thelevel flight acceleration technique. The maximum hoverheights shown are indicative of helicopter performancecapability and do not imply that this hover height must bemaintained through takeoff.NOTEThe maximum hover heights shown are indic-ative of helicopter performance capability anddo not imply that this hover height must bemaintained through takeoff.7A-6-2. Use of Chart.The primary use of the chart is illustrated by the exam-ples.a.To determine the distance required to clear anobstacle, it is necessary to know maximum hover height(hover capability), obstacle height, and climbout true air-speed. Calculation of maximum hover height is de-scribed in Section V, Hover. Enter the chart for the re-quired obstacle height, move right to desired trueclimbout airspeed, then down and read distance requiredto clear obstacle.b.A hover check should be made prior to takeoff toverify hover capability. If winds are present, hover capa-bility will be greater than predicted since the hover chartis based on calm wind conditions.7A-6-3. Conditions.a.The takeoff chart is based on calm wind condi-tions. Since the surface wind velocity and direction can-not be accurately predicted, all takeoff planning shouldbe based on calm air conditions. Takeoff into the wind willimprove takeoff performance.CAUTIONA tailwind during takeoff and climb - outwill increase the distance for obstacleclearance and may prevent a successfultakeoff.b.Takeoff performance data are based on the useof maximum torque available at 100% RRPM
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