TM 1-1520-240-107A-9-1SECTION IX. CLIMB DESCENT7A-9-1. Description.a.Climb and descent performance may be seen infigure 7A-9-1, which represents change in torque to climbor descend at selected GWs.b.The climb performance charts, figure 7A-9-2,shows relationships between GW, initial and final altitudeand temperatures, time to climb, and distance coveredand fuel used while climbing. The chart is presented forclimbing at hotter and colder temperatures, intermedi-ate torque (30 minute operation).7A-9-2. Use of Chart.The primary use of the charts is illustrated by the chartexamples.a.To determine torque change for a specific rate ofclimb or rate of descent (fig. 7A-9-1), enter rate of climbor descent and move right to gross weight, move downand read change. This torque change must be added tothe torque required for level flight for climb, or subtractedfor descent, to obtain total climb or descent torque.b.Rate of climb or descent may also be obtained byentering with a known torque change, moving upward togross weight, moving left and reading rate of climb ordescent.c.To use the climb performance charts (fig. 7A-9-2),enter at the top left at the known gross weight, move rightto the initial press alt (pressure altitude), move down tothe FAT at that altitude, and move left and record time,distance, and fuel. Subtract the time, distance, and fuelvalues of the initial altitude-temperature condition fromthose of the final altitude-temperature condition to findthe time to climb, distance covered, and fuel used whileclimbing.7A-9-3. Conditions.The climb and descent charts are based on 100%RRPM. The climb speed schedule shown in figure7A-9-2 (see insert) is for optimum climb, that is, minimumpower required and maximum power available (30 min-utes). It is an average schedule for the GW range andatmospheric conditions for the CH-47D.
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