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7-70
TM 1-1520-238-10
Figure 7-18. Drag Chart and Authorized Armament Configurations (Sheet 2 of 2)
7-71
TM 1-1520-238-10
Section VIl. CLIMB-DESCENT
7.25 DESCRIPTION
The climb descent chart (fig 7-19) shows the change in
torque (above and below the torque required for level
flight under the same configuration, gross weight, and
atmospheric conditions) to obtain a desired rate of
climb or descent.
7.26 USE OF CHART.
The primary use of the chart is illustrated by the example.
To determine the change in torque, it is necessary
to know the gross weight and the desired rate of climb
or descent. Enter the chart at the desired rate of climb
or descent, move right to the known gross weight, and
7-72
then move down and read the torque change, This
torque change must be added to (for climb) or subtracted
from (for descent) the torque required for level
flight (obtained from the appropriate cruise chart) to
obtain a total climb or descent torque.
By entering the chart with a known torque change, and
moving up to the known gross weight and then left, the
corresponding rate of climb or descent can also be obtained.
7.27 CONDITIONS.
The climb-descent chart is based on 100% rotor rpm.
TM 1-1520-238-10
Figure 7-19. Climb-Descent Chart
7-73/(7-74 blank)

CAUTION
TM 1-1520-238-10
CHAPTER 7A
PERFORMANCE DATA FOR AH-64A HELlCOPTERS
EQUIPPED WITH T-700-GE-701C ENGINES
Section I. INTRODUCTION
NOTE
This chapter contains performance data
for helicopters equipped with
T-700-GE-701C 701C engines. Performance
data for helicopters equipped with
T-700-GE-701 701 engines is contained in
Chapter 7. Users are authorized to remove
the chapter that is not applicable
and are not required to carry both chapters
on the helicopter.
7A.1. PERFORMANCE DATA.
The purpose of this chapter is to provide the best available
performance data for the AH-64A helicopter
equipped with -701C engines. Regular use of this information
will allow maximum safe use of the helicopter.
Although maximum performance is not always required,
regular use of the information in this chapter is
recommended for the following reasons:
a. Knowledge of performance margins will allow
better decisions when unexpected conditions or alternate
missions are encountered.
b. Situations requiring maximum performance will
be more readily recognized.
c. Familiarity with the data will allow performance
to be computed more easily and quickly.
d. Experience will be gained in accurately estimating
the effects of conditions for which data is not presented.
NOTE
The information is primarily intended for
mission planning and is most useful when
planning operations in unfamiliar areas
or at extreme conditions. The data may
also be used in flight, to establish unit or
area standing operating procedures, and
to inform ground commanders of performance/
risk tradeoffs.
The data presented covers the maximum range of
conditions and performance that can reasonably be expected.
In each area of performance, the effects of altitude,
temperature, gross weight and other parameters
relating to that phase of flight are presented. In addition
to the presented data, judgment and experience
will be necessary to accurately determine 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.
7A.2. OPERATIONAL LIMITS.
Exceeding operational limits can
cause permanent damage to critical
components. Overlimit operation can
decrease performance, cause immediate
failure or failure on a subsequent
flight.
Applicable limits are shown on the charts as bold lines
with a description. Performance generally deteriorates
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.
7A-1
TM 1-1520-238-10
Figure 7-6. Hover Chart Mill
7-12 Change 3
TM 1-1520-238-10
7A.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
form of the unit.
TEMPERATURE CONVERSION
　
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