C9, TM 9-2350-230-12
Figure 2-22. Manual operation of commander's power assist cupola
Section 2-5. OPERATION OF SIGHTING AND FIRE CONTROL
AND ARMAMENT BORESIGHT PROCEDURE
an articulated joint so that the eyepiece is made
2-6. Operation Instructions.
conveniently available to the gunner throughout the
range of gun elevation and depression. A dioptral
a. General. The following tables and illustrations
adjustment is provided to accommodate focal variations
provide sighting and fire control operating and armament
between individual observers. A field (user) parallax
boresight instructions.
correction adjustment for the telescope and the mount is
also incorporated. Two separate reticle patterns, one for
NOTE.
Before operation the crew should be
the conventional round and one for the guided missile,
familiarized with the location and operation of all controls
may be presented separately in the field of view by
and instruments (figs. 2-23 through 2-29).
means of optical projection. Selection of reticles is made
by actuating a switch, while illumination intensity of either
b. M119 or M127 Telescope. The telescope, with
the conventional ammunition or the missile pattern is
associated M149 mount and checksight, is a primary fire
controlled by a rheostat on the gunner's reticle dimmer
control instrument employed by the gunner. The M127 is
box. Accurate boresight retention is ensured when the
similar to the M119 in design and operation, with the
patterns are interchanged because no physical
additional feature of dual (8 or 12) power magnification.
movement of parts is required. Associated equipment
A selector lever, mounted on right side of telescope,
necessary for proper installation and operation of the
provides 12X magnification when positioned toward
M119 or M127 Telescope consists of:
operator. (Advantage: Provides gunner with choice of
magnification when viewing targets for either
(1) M149 Telescope Mount. The mount supports
conventional or missile round. ) The M127 will replace
the missile tracker which is part of the missile
the M119 in all M551 vehicles.
subsystem. A checksight mounted on the left
side of the assembly is used for optical
The telescope is a hermetically sealed direct fire control
alignment of the missile tracker and the
instrument for conventional ammunition, and, with a
telescope.
associated tracker, is also part of the missile subsystem.
The telescope, attached to the mount, is mounted
coaxially with the 152MM gun -launcher and embodies
2-35
