Preparation for Firing.

TM 9-6920-361-13&P

(5) The same 01-02 base can be used to

MY COMMAND" allowing the observer to fire as soon as

conduct an MPI registration provided the chart location

the target area is adequately illuminated. This may allow

of the MPI is about the same as the chart location of HB.

the observer to see the results of two corrections with

Registration corrections obtained from an MPI

one flare.

registration can be applied to all subsequent fire using

the PD fuze.

2-13.

Preparation for Firing.

(6) Precision fire is conducted with one

a. Assembly and Installation. Assemble or

gun on a point target to obtain registration corrections or

install the trainer or subcaliber device in accordance with

to destroy a target. Since there is no fragmentation of

applicable paragraphs 2-6 through 2-10.1)

the projectile, most targets should be considered

destroyed after one or two target hits. Data obtained

NOTE

from a precision registration may be used to construct an

Trainer M31 will be positioned with

OF chart or to determine corrections to survey chart

the rear leg opposite the direction of

data. The 01-02 personnel and the forward observers

fire.

use the same procedures for spotting as with their

primary weapon.

b. Boresighting. The trainer or subcaliber

device has been boresighted during assembly or

(7) If a MET station is available, you

installation. Recheck boresighting in accordance with

should conduct your precision registration concurrent

applicable paragraphs (para. 2-6 through 2-10.1).

with the time of the MET in order to determine a VE.

(8) The survey party may locate targets

accurately enough (within 0.1 meters) to use MET plus

VE techniques in engagement as outlined in FM 640.

The 14.5-mm tabular firing tables contain sufficient

information plus sample problems to allow FDC

personnel to work a MET as though they were working it

for their primary weapon (weight of projectile cannot be

determined accurately, so we do not attempt to apply

that value). A propellant temperature correction can be

applied if the powder thermometer is placed in the

vicinity of the projectiles.

(9) High angle fire mission with one

battery adjusting and massing the battalion can be

conducted with very good results even when the wind is

blowing 20 to 30 miles per hour. The 10m site factor on

the GFT should be used to determine site. Do not

attempt to fire at a quadrant elevation above 1250 mils

Figure 2-18. Operation of safety

since the round may not impact with the nose of the

projectile in the downward position.

2-14.

Firing the Trainer.

(10) The time of flight on the GFT and in

a. Loading. Pull the breech bolt to the rear,

the TFT is sufficiently accurate to permit battalion TOT

and make sure the bore and chamber are dry and free of

missions to be fired. Battalion TOT targets should be

dirt and foreign matter. Place safety in the safe position,

selected near a lateral limit rather than in the center of

(fig. 2-18), insert a cartridge in the chamber and close

sector, so as to allow different times of flight for each

the bolt.

battery.

Firing. Rotate safety to fire position.

(11) Coordinated illumination missions may

Depress the trigger by pulling the lanyard, or if lanyard

be fired by having the forward observer, or someone

ring assembly is not installed, by placing the thumb on

located in the vicinity of the OP, fire at the appropriate

the trigger and the forefinger on the opposite side of the

time either a hand-held, star-cluster parachute flare or a

receiver to prevent lateral movement of the barrel when

flare fired from the M79 grenade launcher. The flare will

trigger is depressed.

provide illumination over most of the impact area for

about one minute. The call for fire should include "AT

Change 1

2-25