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the aircraft by experienced flight test personnel at precise
conditions using sensitive calibrated instruments.
b. Calculated Data. Data based on tests, but not on
flight test of the complete aircraft.
TM 1-1520-240-10
7A-1-2
c. Estimated Data. Data based on estimates using
aerodynamic theory or other means but not verified by
flight test.
7A-1-6. Specific Conditions.
The data presented is accurate only for specific conditions
listed under the title of each chart. Variables for
which data are not presented, but which may affect that
phase of performance, are discussed in the text. Where
data is available or reasonable estimates can be made,
the amount that each variable affects performance will be
given.
7A-1-7. General Conditions.
In addition to the specific conditions, the following general
conditions are applicable to the performance data.
a. Rigging. All airframe and engine controls are
assumed to be rigged within allowable tolerances.
b. Pilot Technique. Normal pilot technique is
assumed.
c. Aircraft Variation. Variations in performance
between individual aircraft are known to exist: however,
they are considered to be small and cannot be accounted
for individually.
d. Instrument Variations. The data shown in the
performance charts does not allow for instrument
inaccuracies or malfunctions.
e. Airspeed Calibrations. The airspeed calibration
chart presents the difference between indicated airspeed
(IAS), and calibrated airspeeds (CAS) for different flight
conditions.
f. Except as noted, all data is for clean configuration
(all doors installed, without armament).
g. Types of Fuel. All flight performance data is
based on JP-5 fuel. The change in fuel flow and torque
available, when using JP-4, JP-8, Aviation gasoline or
any other approved fuels, is insignificant.
7A-1-8. 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.
7A-1-9. 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
7A-1-3/(7A-1-4 blank)
Figure 7A-1-1. Temperature Conversion Chart

TM 1-1520-240-10
7A-2-1
SECTION II. CONTINGENCY TORQUE AVAILABLE
7A-2-1. Contingency Torque Available.
Single engine contingency torque available may be obtained
from figure 7A-2-1. Available torque is presented
in terms of PA and FAT.
7A-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.
7A-2-3. Conditions.
The chart is based on a rotor speed of 100%.
7A-2-4. EAPS Installed.
Reduce the derived torque available by 2.0% however
not at transmission torque limit.
TM 1-1520-240-10
7A-2-2
Figure 7A-2-1. Contingency Torque Available
TM 1-1520-240-10
7A-3-1
SECTION III. MAXIMUM TORQUE AVAILABLE
7A-3-1. Maximum Torque Available (10 Minute Operation).
Maximum torque available (10 minute operation) may be
obtained from figure 7A-3-1. Available torque is presented
in terms of pressure altitude and free air temperature.
7A-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.
7A-3-3. EAPS Installed.
Reduce the derived torque available by 1.8% however
not at transmission torque limit.
7A-3-4. Conditions.
The chart is based on a rotor speed of 100%.
7A-3-5. Intermediate Torque Available (30 Minute
Operation).
Maximum Torque Available (30 Minute Operation) may
　
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