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of 60 pounds. The floor area is approximately 4.16
square feet and the volume is approximately 21 cubic
feet. Floor tiedown fittings are in place to accommodate
the flyaway kit.
6.3.4 Survival Kit Bay. The survival kit bay is
reached from either side. From fuselage station 310.0
to 340.0, it can be loaded to 15 pounds per square foot
with a capacity of 100 pounds. A single concentrated
load of 45 pounds with a load density of 45 pounds per
square foot may be carried. The floor area is approximately
7.3 square feet and the volume is approximately
17 cubic feet. Floor tiedown fittings are in place to accommodate
the survival kit.
NOTE
6.3.1 CPG Crew Station. The CPG station extends When loading these two bays, check for
from station 35.5 to station 115.0. The CPG nominal exceeding the aft cg limit.
6-1
TM l-1520-238-10
M01-097G
Figure 6-1. Station Diagram
6-2 Change 4
TM 1-1520-238-10
Section Il. WEIGHT AND BALANCE
6.4 WEIGHT AND BALANCE.
This section contains information needed to compute
the weight and balance for an individual helicopter by
using the prescribed standard charts and forms.
6.5 WEIGHT DEFINITIONS.
6.5.1 Basic Weight. The normal basic weight of this
helicopter includes wing pylons, all fixed operating
equipment, 30mm gun, all oil, and trapped fuel. It is
only necessary to add the variables or expendable to
these items for the missions.
NOTE
The basic weight of the helicopter will
vary with mission requirements and
structural modifications such as addition
or removal of wing pylons, peculiar kits,
30mm gun, turret, ammo handling system,
etc. A continuing record of an individual
helicopter’s basic weight is maintained
on Chart C - Basic Weight and
Balance Record, DD Form 365-3.
6.5.2 Operating Weight. The operating weight of the
helicopter is the basic weight plus those variables
which remain substantially constant for a particular
mission. These items include crew, baggage, rocket
launchers, Hellfire launchers, and any emergency or
extra equipment that may be required.
6.5.3 Gross Weight. The gross weight is the total
weight of the helicopter and its contents.
6.6 BALANCE Definitions.
6.6.1 Reference Datum. The reference datum is an
imaginary vertical plane from which all horizontal distances
are measured (in inches) for balance purposes.
6.6.2 Arm. For balance purposes, the term ARM is
the horizontal distance (in inches) from the reference
datum to the center of gravity of a given item. For special
cases, ARM can be determined form figure 6-1. For
the AH-64A helicopter, ARM and fuselage station (FS)
are the same.
6.6.3 Moment. Moment is the weight of an item multiplied
by its arm. For the AH-64A helicopter, moment
divided by 100 (moment/100) is used to simplify calculations
by reducing the number of digits.
NOTE
Throughout this chapter, moment/100 figures
have been rounded off to the nearest
whole number. When moments from other
sources are being used, they must be divided
by 100 and rounded off.
6.6.4 Average Arm. Average arnris the arm obtained
by adding the weights and the moments of a number of
items and dividing the total moment by the total
weight.
6.6.5 Basic Moment. Basic moment is the sum of the
moments of all items making up the basic weight with
respect to the helicopter reference datum.
6.6.6 Center of Gravity (CG). Center of gravity is the
point about which the helicopter would balance if suspended.
Distance from the reference datum is found by
dividing the total moment by the gross weight of the helicopter.
6.6.7 CG Limits. The cg limits are the extremes of
movement to which the helicopter cg can travel without
endangering controllability or structural integrity. The
cg of the loaded helicopter must remain within these
limits at takeoff, throughout flight, and during landing.
6.7 LOADING DATA.
The loading data in this chapter is intended to provide
information necessary to work loading problems for the
helicopter. From this data, weight and moment/100 are
obtained for all variable load items and are added to the
current basic weight and moment/100 from Chart C
(DD Form 365-3) to determine the gross weight and
moment/100 using Form F (DD Form 365-4). The effect
on helicopter cg of expending the fuel and armament in
a logical sequence may be checked by subtracting the
weight and moment/100 of each item from the takeoff
gross weight and moment/100; then, checking the new
moment (or helicopter cg) with the cg limits chart. This
　
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