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be necessary to accurately obtain performance under a
given set of circumstances. The conditions for the data
are listed under the title of each chart. The effects of
different conditions are discussed in the text accompanying
each phase of performance. Where practical, data is
presented at conservative conditions. However, NO
GENERAL CONSERVATISM HAS BEEN APPLIED. All
performance data presented is within the applicable limits
of the aircraft.
CAUTION
Exceeding operating limits can cause permanent
damage to critical components.
Over limit operation can decrease performance,
cause immediate failure, or failure
on a subsequent flight.
7-1-3. Limits.
Applicable limit lines are shown on the charts. The
dashed lines on the cruise charts are estimated airspeed
limits with an operating cruise guide indicator (CGI).
Airspeed limits with the CGI inoperative are in Chapter 5.
If limits are exceeded, minimize the degree and time.
7-1-4. Use of Charts.
a. Chart Explanation. The first page of each section
describes the chart(s) and explains its use.
b. The primary use of each chart is given in an example
and a guideline is provided to help you follow the
route through the chart. 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 the top left scale, move right to the
second variable, deflect down at right angles to the third
variable, deflect left at right angles to the fourth variable,
deflect down, etc. until the final variable is read out at the
final scale. In addition to the primary use, other uses of
each chart are explained in the text accompanying each
set of performance charts.
NOTE
An example of an auxiliary use of the charts
referenced above is as follows: Although the
hover chart is primarily arranged to find
torque required to hover, by entering torque
available as torque required, maximum wheel
height for hover can also be found. In general,
any single variable can be found if all others
are known. Also, the tradeoffs between variables
can be found. For example, at a give
pressure altitude (PA), you can find the maximum
GW capability as free air temperature
(FAT) changes.
c. Dashed Line Data. Data beyond conditions for
which tests were conducted, or for which estimates are
used, are shown as dashed lines.
7-1-5. Data Basis.
The type of data used is indicated at the bottom of each
performance chart under DATA BASIS. The applicable
report and date of the data 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 by experienced flight test personnel at precise
conditions using sensitive calibrated instruments.
TM 1-1520-240-10
7-1-2
b. Calculated Data. Data based on tests, 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.
7-1-6. 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.
7-1-7. 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
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