HEADQUARTERS OH-58A, Technical Manual, Page: 195 / 292

TM 55-1520-228-10
Change 11 7-5
7-7. SPECIFIC CONDITIONS.
The data presented are accurate only for specific condi-
tions 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 are available or reasonable estimates can be
made, the amount that each variable affects perfor-
mance will be given.
7-8. GENERAL CONDITIONS.
In addition to the specific conditions, the following gen-
eral conditions are applicable to the performance data.
a. Rigging. All airframe and engine controls are as-
sumed to be rigged within allowable tolerances.
b. Pilot Technique. Normal pilot technique is as-
sumed. Control movements should be smooth and con-
tinuous.
c. Aircraft Variation. Variations in performance
between individual aircraft are known to exist; however,
they are considered to be small and cannot be individu-
ally accounted for.
d. Instrument Variation. The data shown in the
performance charts do not account for instrument inac-
curacies or malfunctions.
e. Types of Fuel. All flight performance data is
based on JP-4 fuel. The change in fuel flow and torque
available, when using JP-5, JP-8, Aviation gasoline, or
any other approved fuels, is insignificant.
7-9. 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 perfor-
mance. Knowledge will also be gained concerning the
effects of variables for which data are not provided,
thereby increasing the accuracy of performance predic-
tions.
7-10. DEFINITIONS OF ABBREVIATIONS.
a. Unless otherwise indicated in the following list of
abbreviations, abbreviations and symbols used in this
manual conform to those established in Military Stan-
dard MIL-STD-12, which is periodically revised to reflect
current changes in abbreviations usage. Accordingly, it
may be noted that certain previously established defini-
tions have been replaced by more current abbreviations
and symbols.
b. Capitalization and punctuation of abbreviations
varies, depending upon the context in which they are
used. In general, lower case abbreviations are used in
text material, whereas abbreviations used in charts and
illustrations appear in full capital letters. Periods do not
usually follow abbreviations; however, periods are used
with abbreviations that could be mistaken for whole
words if the period were omitted.
c. The following list provides definitions for abbre-
viations used in this manual. The same abbreviation
applies for either singular or plural applications.
LIST OF ABBREVIATIONS
Abbreviation Definition Abbreviation Definition
AGL Above ground level FAT Free air temperature
ALT Altitude FLT Flight
AVAIL Available FT Foot
C Celsius FT/MIN Foot per minute
CAS Calibrated airspeed FWD Forward
CL Centerline
n
F Increment of equivalent flat
plate drag area
CONFIG Configuration
plate drag area
CONT Continuous GAL Gallon
ECU Environmental Control Unit GAL/HR Gallons per hour
END Endurance GW Gross weight
F Fahrenheit HP Horsepower