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7A-4 Change 2
TM 1-1520-238-10
Figure 7A-2. Maximum Torque Available Chart (Sheet 1 of 3)
7A-5
TM 1-1520-238-10
Figure 7A-2. Maximum Torque Available Chart (Sheet 2 of 3)
7A-6
TM 1-1520-238-10
Figure 7A-2. Maximum Torque Available Chart (Sheet 3 of 3)
7A-7
TM 1-1520-238-10
Figure 7A-3. Torque Factor Chart
7A-8
TM 1-1520-238-10
Figure 7A-4. Torque Conversion Chart
7A-9
TM 1-1520-238-10
Section Ill. HOVER CEILING
7A.13. DESCRIPTION.
The hover ceiling charts (fig 7A-5 sheets 1 and 2) presents
the maximum gross weight for hovering at various
conditions of pressure altitude, free air temperature,
and wheel height, using maximum torque available, 30
minute limit or maximum torque available, 10 minute
limit.
7A.14. USE OF CHARTS.
The primary use of the hover ceiling charts is illustrated
by the examples. To determine the maximum
gross weight for hover, it is necessary to know the pressure
altitude, free air temperature, and desired wheel
height. Enter the appropriate power available chart at
the pressure altitude, move right to FAT, move down to
the desired wheel height and then move left and read
maximum gross weight.
7A.15. CONDITIONS.
The hover ceiling charts are based on maximum torque
available, 30 minute limit and 10 minute limit; 100%
rotor rpm, ATF = 1.0, ENG INLET anti-ice switch
OFF; and rotor BLADE de-ice switch off. For ENG INLET
ANTI-ICE switch ON, use dashed lines. Applicable
configuration is all external stores except four external
fuel tanks. For the four external tank
configuration, reduce the maximum gross weight for
hover, as calculated from the hover ceiling charts, by 11
pounds for each 1000 pounds of gross weight. See the
examples below.
HOVER CEILING
EXAMPLE 1
(SHEET 1)
WANTED
MAXIMUM GROSS WEIGHT FOR HOVER AT 10-FOOT
WHEEL HEIGHT, 30-MINUTE LIMIT TORQUE
AVAILABLE, FOR ENGINE INLET ANTI-ICE OFF AND
ON
KNOWN
PRESSURE ALTITUDE = 10,000 FEET
FAT = -10°C
WHEEL HEIGHT = 10 FEET
METHOD
ENTER PRESSURE ALTITUDE SCALE AT 10,000 FT
MOVE RIGHT TO -10°C FAT, SOLID LINE FOR
ANTI-ICE OFF, DASHED LINE FOR ANTI-ICE ON
MOVE DOWN TO 10 FEET WHEEL HEIGHT
MOVE LEFT TO READ GROSS WEIGHT FOR HOVER:
ANTI-ICE OFF, HOVER GW = 17,520 LB
ANTI-ICE ON, HOVER GW = 15,850 LB
WITH 4 EXT TANKS INSTALLED
ANTI-ICE OFF
HOVER GW = 17,520-11
= 17,327 LB
(17,520/1000)
EXAMPLE II
(SHEET 2)
WANTED
MAXIMUM GROSS WEIGHT FOR HOVER AT 10-FOOT
WHEEL HEIGHT, 10-MINUTE LIMIT TORQUE
AVAILABLE, FOR ENGINE INLET ANTI-ICE OFF AND
ON
KNOWN
PRESSURE ALTITUDE = 10,000 FEET
FAT = -10°C
WHEEL HEIGHT = 10 FEET
METHOD
ENTER PRESSURE ALTITUDE SCALE AT 10,000 FT
MOVE RIGHT TO -10°C FAT, SOLID LINE FOR
ANTI-ICE OFF, DASHED LINE FOR ANTI-ICE ON
MOVE DOWN TO 10 FEET WHEEL HEIGHT
MOVE LEFT TO READ GROSS WEIGHT FOR HOVER:
ANTI-ICE OFF, HOVER GW = 18,000 LB
ANTI-ICE ON, HOVER GW = 16,400 LB
WITH 4 EXTERNAL TANKS INSTALLED
ANTI-ICE OFF
HOVER GW = 18,000-11 (18,000/1000)
= 17,802 LB
7A-10
TM 1-1520-238-10
Figure 7A-5. Hover Ceiling Chart (Sheet 1 of 2)
7A-11
TM 1-1520-238-10
Figure 7A-5. Hover Ceiling Chart (Sheet 2 of 2)
7A-12
TM 1-1520-238-10
Section IV. HOVER LIMITS
7A.16. DESCRIPTION.
The hover chart (fig 7A-6) shows the torque required to
hover at various conditions of pressure altitude, free air
temperature, gross weight, wheel height, and with external
tanks or without external tanks.
7A.17. USE OF CHART.
The primary use of the chart is illustrated by the example.
To determine the torque required to hover, it is necessary
to know the pressure altitude, free air temperature,
gross weight, and desired wheel height. Enter the
upper right grid at the known pressure altitude, move
right to the temperature, move down to the gross
weight, move left to the desired wheel height, and then
move up and read the torque required to hover.
In addition to its primary use, the hover chart maybe
used to predict the maximum hover height. To determine
maximum hover height, it is necessary to know
pressure altitude, free air temperature, gross weight,
and maximum torque available. Enter the known pressure
altitude, move right to the temperature, move
down to the gross weight, then move left to intersection
with maximum torque available and read wheel height.
This wheel height is the maximum hover height.
The hover chart may also be used to determine the
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