TM 1-1520-240-107A-5-1SECTION V. HOVER7A-5-1. Description.The hover chart, figure 7A-5-1, presents torque requiredto hover at 100% RRPM at various combinations of PA,FAT, GW, and wheel height for single and dual engineoperation.7A-5-2. Use of Chart.a.The primary use of the charts is illustrated by theexample. To determine the torque required to hover, it isnecessary to know PA, FAT, GW, and desired wheelheight. Enter the upper right grid at the known pressurealtitude, move right to the temperature, move down togross weight. Move left to desired wheel height, deflectdown and read torque required for dual engine or singleengine operationb.In addition to the primary use, the hover ceilingcharts (fig. 7A-5-2) may be used to predict maximumhover height. This information is necessary for use of thetakeoff chart found in figure 7A-6-1. To determine maxi-mum hover height, it is necessary to know PA, FAT, GW,and maximum torque available. Enter at the known pres-sure altitude, move right to FAT, move down to grossweight, move left to intersection with maximum torqueavailable and read wheel height. This wheel height is themaximum hover height.c.The hover charts may also be used to determinemaximum GW for hover at a given wheel height, PA, andtemperature. Enter at known pressure altitude, moveright to the FAT, then move down to the bottom of thelower grid, and read density altitude. Now enter lower leftgrid at maximum torque available. Move up to wheelheight, then move right to density altitude and read GW-This is the maximum gross weight at which the helicopterwill hover.7A-5-3. Conditions.a.The hover chart is based on calm wind, level surface,and 100% RRPM.b.Hover in ground effect (HIGE) data is based onhovering over a level surface. For normal transition fromhover to forward flight, the minimum hover wheel heightshould be 10feet to prevent ground contact. If helicopteris to hover over a surface known to be steep, coveredwith vegetation, or if type of terrain is unknown, the flightshould be planned for hover out of ground effect (HOGE)capability.
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