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Section IV. OPERATION UNDER USUAL CONDITIONS
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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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Chapter 3 OPERATOR/CREW AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
TM 9-1270-212-14&P
When firing a 40-mm, 20-mm or 7.62-mm
Do not engage the TSU left hand grip ACTION
weapon, keep the sight on the target and the
switch during any switching action on the
ACTION switch closed after trigger release
armament control panels.
until the gun stops firing.
h. Press the TRIGGER switch. The turret continues to
d. Electrically bypass the TSU by setting the MODE
follow the sight, firing as desired, until one of the turret
SELECT switch on the TOW control panel to OFF or by
limits is reached (110 degrees in azimuth; +18 degrees, -60
setting the ACQ TRK STOW switch (fig. 2-5) to STOW.
degrees in elevation). At that point, the gun will cease to
fire and the reticle will begin to flash, indicating an
e. Insure that the MASTER ARM switch is set to ARM.
out-of-coincidence condition.
f. Hold the sight steady on target.
i. Set the MASTER ARM switch on the pilot arma-
g. Press the ACTION switch on the TSU left hand grip
ment control panel to STBY or to OFF and the INV (or
ALTNR) and BAT (or BATTERY) switches to OFF.
(fig. 2-3). The turret follows the sight.
Section V. OPERATION UNDER UNUSUAL CONDITIONS
Condensation or freezing moisture on the optical sights can
2-14. General.
obstruct vision and interfere with proper use of the
instruments.
The only precautions necessary when operating the HSS
under  unusual environmental conditions pertain to
b. Operation in Sand or Dust. When operating in sand
operating in extreme cold or in sand or dust.
or dust, clean the linkage rails frequently with a clean cloth
and alcohol or other solvent that will not leave a residue. If
2-15. Operation Under Unusual Conditions.
the linkage arm assembly becomes hard to operate along
the rails, the linkage assembly may require replacement. See
a. Operation in Extreme Cold. When operating in
Chapter 5, paragraphs 5-13 through 5-19, for removal and
extreme cold, avoid breathing on the optical sights.
installation instructions.

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