Section IV. OPERATION UNDER USUAL CONDITIONS

TM 9-1270-212-14&P

2-10. Helmet Boresighting Using the Helmet Boresight

Perform the procedures given in paragraph 2-9, except

Cable.

connect the helmet boresight cable between connector

A1P1 of the helmet sight assembly and the mating con-

This procedure allows boresighting of the helmet sight

nector (17P2 or 17P1).

assembly by personnel seated outside the helicopter. The

helmet wearer can sit on a chair or other convenient item.

Section IV. OPERATION UNDER USUAL CONDITIONS

2-11. GeneraI.

This section covers normal operation of the HSS for

firing the gun turret.

When firing a 40-mm, 20-mm, or 7.62-mm

2-12. Pilot's Operating Procedure.

weapon, keep the sight on the target and the

ACTION switch closed after trigger release

NOTE

until the gun stops firing.

In the procedures below, where the nomen-

When firing the turret weapon with the helmet sight,

clature of a control, control position, or indi-

hold the sight steady on the target, press the TRIGGER

cator differs between the AH-1S(Mod) and

ACTION (or ACTION) switch and then the TRIGGER

AH-1S

helicopters, the basic nomen-

TURRET FIRE (or GUN FIRE) switch on the cyclic

clature used is that for the AH-1S(Mod) heli-

stick grip (fig. 2-4). Holding the helmet sight reticle on

copter and the nomenclature for the AH-lS

the target causes the turret to continue to point at the

helicopters follows, in parentheses

target until one of the turret limits is reached (110 de-

and prefixed with an "or;" for example, "PLT

grees in azimuth +18 degrees, -60 degrees in elevation).

(or PILOT)" in d below.

At that point, the gun will cease to fire and the reticle

will begin to flash, indicating an out-of-coincidence condi-

a. Set the helicopter controls as stated in paragraph 24.

tion.

Then set the MASTER ARM switch on the pilot armament

control panel (fig. 2-1) to STBY.

g. Set the MASTER ARM switch on the pilot armament

control panel to STBY or to the off position.

b. Connect the helmet sight cable connector to the

h. After landing, set the WPNS FIRE and TURRET

connector shown in figure 2-12.

PWR circuit breakers on the dc circuit breaker panel (or

the WPN FIRE and WPN CONT (or WPN CONTR) circuit

c. Attach the linkage assembly steel fastener to the

breakers on the ac and armament circuit breaker panel)

helmet sight receptacle as shown in figure 2-13, close the

to the off position.

latch, and adjust the reticle lighting to the desired intensity.

2-13. Gunner's Operating Procedure.

a. Direct the pilot to set the WPN CONT (or WPN

CONTR) selector switch on the pilot armament control

panel (fig. 2-1) to GUNNER and to set the MASTER ARM

Do not engage a cyclic stick armament switch

switch to STBY.

during any switching action on the armament

b. Connect the helmet sight cable connector to the

control panels.

gunner's connector (right side of seat).

d Set the WPN CONT (WPN CONTR) switch on the

c. Attach the linkage assembly to t h e h e l m e t s i g h t

pilot armamcnt control panel (fig. 2-1) to PLT (or PILOT).

receptacle as shown in figure 2-13, close the latch, and

adjust the reticle lighting to the desired intensity.

e . Set the MASTER ARM switch to ARM.

2-20