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any other approved fuels, is insignificant.
7-1-8. ERFS II Performance Data.
Use of the performance data will enable the operator to
receive the maximum safe utilization of the ERFS II and
FARE kit.
7-1-9. ERFS II Tank Capacity.
The capacity of the ERFS II tank using pressure refueling
is 805.5 US gallons. If filled using gravity refueling, the
capacity is 825.5 US gallons (In both cases 5.5 GALS will
be unusable).
7-1-10. Amount of Unusable Fuel.
7-1-11. Fuel Transfer Rate.
The amount of unusable fuel in each of the ERFS II tanks
is 5.5 US gallons of JP-8.
The rate at which fuel is transferred from the ERFS II
tanks to the helicopter main tanks is 23 GPM.
7-1-12. FARE Transfer Rate.
The FARE kit pump is rated at 120 GPM. However, the
configuration of the FARE fuel transfer hose assembly
affects this transfer rate. Pressure losses across couplings,
filters, and nozzles reduce the flow rate below the
rated value. The rate at which fuel is transferred from the
ERFS II tanks using the FARE pump and standard configuration
of the FARE fuel transfer hose assemble is 84
to 88 GPM.
7-1-13. Performance Discrepancies.
Regular use of this chapter will allow you to monitor instruments
and other aircraft systems for malfunction by
comparing actual performance with planned performance.
Knowledge will also be gained concerning the
effects of variables for which data are not provided,
thereby increasing the accuracy of performance predications.
7-1-14. Definitions of Abbreviations.
Capitalization and punctuation of abbreviations varies,
depending upon the context in which they are used. In
general, full capital letter abbreviations are used in text
material, charts and illustrations. Periods do not usually
follow abbreviations; however, periods are used with abbreviations
that could be mistaken for whole words if the
period were omitted.
TM 1-1520-240-10
7-1-3/(7-1-4 blank)
Figure 7-1-1. Temperature Conversion Chart

TM 1-1520-240-10
7-2-1
SECTION II. EMERGENCY TORQUE AVAILABLE
7-2-1. Emergency Torque Available.
Single engine emergency torque available may be obtained
from figure 7-2-1. Available torque is presented
in terms of PA and FAT.
7-2-2. Use of Chart.
The primary use of the chart is to determine available
engine torque for various combinations of PA and temperature.
To determine torque available, it is necessary
to know PA, and FAT. Enter the left side of the chart at
known temperature, move right to known pressure altitude,
then down to read torque available.
7-2-3. Conditions.
The chart is based on a rotor speed of 100%.
7-2-4. EAPS Installed.
Reduce the derived torque available by 2.0% however
not at transmission torque limit.
TM 1-1520-240-10
7-2-2
Figure 7-2-1. Emergency Torque Available
TM 1-1520-240-10
7-3-1
SECTION III. MAXIMUM TORQUE AVAILABLE
7-3-1. Maximum Torque Available (10 Minute
Operation).
Maximum torque available (10 minute operation) may be
obtained from figure 7-3-1. Available torque is presented
in terms of pressure altitude and free air temperature.
7-3-2. USE OF CHART.
The primary use of the chart is to determine available
engine torque for various combinations of pressure altitude
and temperature. To determine torque available, it
is necessary to know pressure altitude and free air temperature.
Enter the left side of the chart at known temperature,
move right to known pressure altitude, then down
to read torque available.
7-3-3. Conditions.
The chart is based on a rotor speed of 100%.
Reduce the derived torque available by 1.8% however
not at transmission torque limit.
7-3-4. Maximum Torque Available (30 Minute
Operation).
Maximum Torque Available (30 Minute Operation)
may be obtained from figure 7-3-2. Available torque
is presented in terms of PA and FAT.
7-3-5. Use of Chart.
The primary use of the chart is to determine available
engine torque for various combinations of pressure altitude
and temperature. To determine torque available, it
is necessary to know pressure altitude and free air temperature.
Enter the left side of the chart at known temperature,
move right to known pressure altitude, then down
to read intermediate torque available.
7-3-6. Conditions.
The chart is based on a rotor speed of 100%.
7-3-7. EAPS Installed.
Reduce the derived torque available by 1.8% however
not at transmission torque limit.
TM 1-1520-240-10
7-3-2
Figure 7-3-1. Maximum Torque Available (10 - Minute Operation)
　
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