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to chart values.
7-39. USE OF CHARTS.
The primary use of the charts is illustrated by the d. Maximum Range. The maximum range lines
example provided. The first step for chart use is to indicate the combinations of weight and airspeed that
select the proper chart, based upon the pressure will produce the greatest flight range per gallon of fuel
altitude and anticipated free air temperature. Normally, under zero wind conditions. When a maximum range
sufficient accuracy can be obtained by selecting the condition does not appear on a chart, It is because the
chart nearest to the planned cruising altitude and FAT, maximum range speed is beyond the maximum
or the next higher altitude. If greater accuracy is permissible speed (Vne); in such cases, use cruising
required, interpolation between altitudes and/or speed Vne to obtain maximum range.
temperatures will be required (see example on page 7-
62). You may enter the charts on any side (TAS, IAS, e. Maximum Endurance and Rate of Climb. The
mast torque, or fuel flow), move v e r t i c a l l y or maximum endurance and rate of climb lines indicate
horizontally to the gross weight, then to the other three the airspeed for minimum torque required to maintain
parameters. Maximum performance conditions are level flight for each gross weight, FAT, and pressure
determined by entering the chart where the maximum altitude. Since minimum torque will provide minimum
range or maximum endurance and rate of climb lines fuel flow, maximum flight endurance will be obtained at
intersect the appropriate gross weight, then read the airspeeds indicated.
airspeed, fuel flow, and mast torque (%Q). For
conservatism, use the gross weight at the beginning of
cruise flight. For greater accuracy on long flights, it is 7-40. CONDITIONS. preferable to determine cruise information for several
flights segments in order to allow for decreasing fuel
weights (reduced gross weight). The following The cruise charts are based upon operation at 100%
parameters contained in each chart are further engine rpm, 801 °C, and basic inlet configuration
explained as follows: (without inlet blast shield).
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Figure 7-15. Cruise Chart, FAT -30 °C, Sea Level to 2000 Feet (Sheet 1 of 23)
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7-62
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Figure 7-15. Cruise Chart, FAT -30 °C, 4000 to 6000 Feet (Sheet 2 of 23)
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7-64
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Figure 7-15. Cruise Chart, FAT -30 °C, 8000 to 10000 Feet (Sheet 3 of 23)
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7-66
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Figure 7-15. Cruise Chart, FAT -30 °C, 12000 to 14000 Feet (Sheet 4 of 23)
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Figure 7-15. Cruise Chart, FAT -15 °C, Sea Level to 2000 Feet (Sheet 5 of 23)
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Figure 7-15. Cruise Chart, FAT -15 °C, 4000 to 6000 Feet (Sheet 6 of 23)
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Figure 7-15. Cruise Chart, FAT -15 °C, 8000 to 10000 Feet (Sheet 7 of 23)
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Figure 7-15. Cruise Chart, FAT -15 °C, 12000 to 14000 Feet (Sheet 8 of 23)
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Figure 7-15. Cruise Chart, FAT 0 °C, Sea Level to 2000 Feet (Sheet 9 of 23)
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Figure 7-15. Cruise Chart, FAT 0 °C, 4000 to 6000 Feet (Sheet 10 of 23)
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Figure 7-15. Cruise Chart, FAT 0 °C, 8000 to 10000 Feet (Sheet 11 of 23)
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Figure 7-15. Cruise Chart, FAT 0 °C, 12000 to 14000 Feet (Sheet 12 of 23)
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Figure 7-15. Cruise Chart, FAT +15 °C, Sea Level to 2000 Feet (Sheet 13 of 23)
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Figure 7-15. Cruise Chart, FAT +15 °C, 4000 to 6000 Feet (Sheet 14 of 23)
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Figure 7-15. Cruise Chart, FAT +15 °C, 8000 to 10000 Feet (Sheet 15 of 23)
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Figure 7-15. Cruise Chart, FAT +15 °C, 12000 to 14000 Feet (Sheet 16 of 23)
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Figure 7-15. Cruise Chart, FAT +30 °C, Sea Level to 2000 Feet (Sheet 17 of 23)
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Figure 7-15. Cruise Chart, FAT +30 °C, 4000 to 6000 Feet (Sheet 18 of 23)
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Figure 7-15. Cruise Chart, FAT +30 °C, 8000 to 10000 Feet (Sheet 19 of 23)
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Figure 7-15. Cruise Chart, FAT +45 °C, Sea Level to 2000 Feet (Sheet 20 of 23)
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Figure 7-15. Cruise Chart, FAT +45 °C, 4000 to 6000 Feet (Sheet 21 of 23)
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Figure 7-15. Cruise Chart, FAT +55 °C, Sea Level to 2000 Feet (Sheet 22 of 23)
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