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TM-9-1270-212-14-P Fire Control Subsystem Helmet Directed XM128 P/N 2277716-00 NSN 1270-00-122-9449 Manual
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Figure 2-16. HSS organizational boresight kit
TM 9-1270-212-14&P
Section III. BORESIGHTING THE HELMET SIGHT ASSEMBLY
2-9. Helmet Boresighting.
2-7. General.
NOTE
This section contains a description of the HSS
organizational boresight kit and the procedures for
In the procedures below, where the nomencla-
boresighting the helmet sight assembly. These procedures
ture of a control, control position, or indicator
cover boresighting with helicopter power and boresighting
differs between the AH-1S(Mod) and the
with the helmet boresight cable.
AH-1S
helicopters, the basic nomen-
2-8. HSS Organizational Boresight Kit.
clature used is that for the AH-1S(Mod) heli-
copter and the nomenclature for the AH-1S
helicopters follows, in parentheses
The HSS organizational boresight kit (fig. 2-16) consists
and prefixed with an "or;" for example, "HSS
of a container, a helmet boresight tool, and a helmet
RETICLE TEST (HSS RTCL TEST or HSS
boresight cable. The complete kit weighs 10 pounds.
LAMP TEST)" in d below.
a. Container. The container is a lightweight, waterproof
a. Perform the procedures of paragraph 2-4, except for
case for transporting and storing the items.
the connection of hydraulic power. Insure that the
b. Helmet Boresight Tool. The helmet boresight tool
MASTER ARM switch on the pilot armament control panel
has two functions:
is set to STBY.
(1) To test the magnetically operated reed switch in
b. Connect the helmet cable connector (paragraph
the helmet receptacle.
2-6a(1)) and put on the helmet. Fasten the chin strap.
(2) To align the helmet receptacle with the reticle
c. Attach the helmet boresight tool to the helmet
line of sight.
magnetic receptacle.
The helmet boresight tool consists of a tube with an
d. Set the HSS RETICLE TEST (HSS RTCL TEST or
eyepiece at one end and an aperture and magnetic
HSS LAMP TEST) switch on the gunner armament control
connector at, the other. The connector mates with the
panel or the HS RTCL TEST (or HSS RTCL TEST) switch
on the pilot armament control panel to TEST and observe
helmet receptacle so that the line of sight of the tool is
that the reticle (fig. 2-17) is lighted. Adjust the appropriate
perpendicular to the mating surface of the receptacle
OFF BRT control for the desired reticle brightness.
magnet.
NOTE
If the boresight tool has been dropped or bent,
misalignment may  result.  Refer to TM
9-4931-363-14&P for inspection and test
procedure to verify accuracy of the boresight
In the step below, the second man must wear
tool.
safety glasses while looking through the helmet
boresight tool.
c. Helmet Boresight Cable. The helmet boresight cable
e. The operator, while seated in the gunner or pilot seat,
is 12 feet long and connects the helmet sight assembly
sights on a distant target (1000 meters or more) through
connector in the helicopter connector A1P1 on the helmet
the helmet sight eyepiece; a second man stands by the open
sight assembly. The cable allows the operators to boresight
door and sights through the helmet boresight tool at the
a helmet sight assembly outside the helicopter.
same target.
d. Socket-Head Screw Keys. T w o 1 / 1 6 - i n c h
f. If the view through the helmet boresight tool is
socket-head screw keys are provided to adjust the three
above, below, left, or right of the target (first column of
socket-head screws in the helmet sight receptacle during
table 2-10), loosen and then tighten the three adjustment
helmet boresighting.

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