C3, TM 9-2350-230-12
Section 2-4. OPERATION OF TURRET AND CUPOLA
mechanical, stop at rear deck. To continue traversing,
2-5. Turret and Cupola Operation Instructions
elevate the gun-launcher to clear the stop.
a. General. The following tables and illustrations
provide turret and cupola operating instructions.
c. Non-Stabilized Mode. When vehicle MASTER
SWITCH and TURRET CONTROL POWER switch are
NOTE. Before operation, the crew should be familiar
turned on, the electric drive control system is in non-
with the location and operation of all controls and
stabilized mode. When either gunner's or commander's
instruments (figs. 2-19 through 2-22).
control handle palm switch is depressed, the weapon
and turret will respond to deflection of the control handle
b. Electric Drive Control System. The electric drive
and elevate, depress, or traverse at a rate dependent on
control system provides controlled power for traversing
degree of deflection.
the turret and elevating and depressing the weapon in
either nonstabilized or stabilized modes. An electrical
d. Stabilized Mode.
When vehicle MASTER
interlock is provided in the turret control switch circuit to
SWITCH, TURRET CONTROL POWER and STAB
prevent accidental operation of turret and weapon. if
switches are turned on and with either control handle
TURRET CONTROL POWER switch has been turned
palm switch depressed, the electric drive control system
on prior to vehicle MASTER SWITCH, the system will not
is in stabilized mode and immediately becomes oriented
function until the TURRET CONTROL POWER switch is
in space at a fixed elevation and traverse attitude with
turned off and then on again. The gun-launcher can be
vehicle moving over rough terrain. The gunner must still
elevated to 336 mils (19 degrees). Depression is limited
aim, track, and fire using traversing and elevating
to 142 mils (8 degrees) over the front and sides of
controls in usual manner, but has an advantage in that
vehicle and 56.8 mils depression over rear deck. When
he is effectively firing from a stable space platform
power traversing the turret and gun-launcher is below
relatively undisturbed by vehicle pitch and roll. The
58.8 mils depression, the gun-launcher will automatically
weapon and sight will remain stabilized in space as long
elevate to clear the rear deck.
as gunner's or commander's palm switch is depressed.
The control handles will move the weapon and turret at
CAUTION: To prevent damage to electric drive
precisely controlled rates as in non-stabilized mode.
system, do not hold control handle in maximum elevation
When control handles are centered, weapon and turret
or depression position when gun-launcher contacts
will again become oriented at elevation and traverse
mechanical stop. In manual traverse, the turret will
attitude relative to space that exists when the controls
contact a
are neutralized.
TABLE 2-7. OPERATION OF TURRET
STEP
PROCEDURE
FIG/ITEM
BEFORE OPERATION
1
Perform before-operation preventive-maintenance checks and
services (table 4-1, steps 20 and 31 through 44).
2
Make certain all personnel are clear of turret. Engine compartment
grilles, and battery and air cleaner access doors and covers
1-2/3, 5, 6,
must be closed.
16
3
Release turret traverse lock.
4
Turn vehicle MASTER SWITCH on, and start engine. Engine must
be operating at 750 RPM to maintain voltage during operation. 2-10
2-29
