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rapidly beyond limits. If limits are exceeded, minimize
the amount and time. Enter the maximum value and
time beyond limits on DA Form 2408-13 to ensure proper
maintenance action is taken.
7-1
TM 1-1520-238-10
7.3 USE OF PERFORMANCE CHARTS.
7.3.1 Chart Explanation. The first page of each section
describes the chart or charts in that section, and explains
how each chart is used.
7.3.2 Reading the Charts. The primary use of each
chart is given in an example. The use of a straight edge
(ruler or page edge) and a hard fine-point pencil is
recommended to avoid cumulative errors. The majority
of the charts provide a standard pattern for use as
follows: Enter first variable on top left scale, move right to
second variable, deflect down at right angles to third
variable, deflect left at right angles to fourth variable, and
deflect down, etc, until final variable is read out on final
scale. In addition to the primary use, other uses of each
chart are explained in the text accompanying each set of
performance charts. Abbreviations and symbols used in
the charts are listed in Appendix B.
NOTE
An example of an auxiliary use of the
performance charts follows: Although
the hover chart is primarily arranged to
find torque required to hover, maximum
wheel height for hover can also be found
by entering torque available as torque
required. In general, any single variable
can be found if all others are known.
Also, the tradeoffs between two
variables can be found. For example, at
a given pressure altitude and wheel
height you can find the maximum gross
weight capability as free air temperature
changes.
7.3.3 Data Basis. The type of data used is indicated at
the bottom of each performance chart under DATA
BASIS. The applicable report and date are also given.
The data provided generally is based on one of the
following categories.
a. Flight Test Data. Data obtained by flight test of
the aircraft at precisely known conditions using sensitive
calibrated instruments.
b. Calculated Data. Data based on test, but not
on flight test of the complete aircraft.
c. Estimated Data. Data based on estimates
using aerodynamic theory or other means but not verified
by flight test.
7.4 PERFORMANCE SPECIFIC CONDITIONS.
The data presented is accurate only for specific
conditions listed under the title of each chart. Variables
for which data is 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 is
given.
7.5 PERFORMANCE GENERAL CONDITIONS.
In addition to the specific conditions, the following
general conditions are applicable to the performance
data:
7.5.1 Rigging. All airframe and engine controls are
assumed to be rigged within allowable tolerances.
7.5.2 Pilot Technique. Normal pilot technique is
assumed. Control movements should be smooth and
continuous.
7.5.3 Aircraft Variation. Variations in performance
between individual helicopters are known to exist; they
are considered small, however, and cannot be
individually accounted for.
7.5.4 Instrument Variation. The data shown in the
performance charts does not account for instrument
inaccuracies or malfunctions.
7.5.5 Configurations. Except as otherwise noted, all
data is for the primary mission configuration consisting of
the basic helicopter plus a pylon and a fully loaded
Hellfire missile launcher on each inboard stores station,
no pylons or stores on outboard stations.
7.5.6 Types of Fuel. All flight performance data is
based on JP-4 fuel. The change in fuel flow and torque
availability, when using approved alternate fuels (table 2-
8), is insignificant.
7.6 PERFORMANCE DISCREPANCIES.
Regular use of this chapter will also allow monitoring
instruments and other helicopter systems for
malfunction, by comparing actual performance with
planned performance. Knowledge will also be gained
concerning the affects of variables for which data is not
provided, thereby increasing the accuracy of
performance predictions.
7.7 TEMPERATURE CONVERSION.
A temperature conversion chart (fig 7-1) is included in
this section for the purpose of converting Fahrenheit
temperatures to Celsius.
7-2 Change 3
TM 1-1520-238-10
7.8 ABBREVIATIONS.
Appendix B is a list of abbreviations and symbols used
on the charts in this chapter. For units of measure, the
same abbreviation applies to either the singular or plural
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