Alignment. - TM-9-4931-583-30-P0016

TM 9-4931-583-30&P

(6) Remove forward gun frame (9, figure 1-2)

NO. 5. Connect illumination assemblies to cable assem-

bly (20) (step a. above). An illumination assembly will

from case No. 4. Attach fitting end to forward fitting of

upper frame assembly (19, figure 1-1), inserting dowel

be placed on each target telescope during each sighting.

pin of fitting such that forward gun optical frame as-

sembly curves downward. Tighten coupling securely

c. Remove boresight telescopes (17) from case

using strap or spanner wrench.

No. 5.

(7) Remove right gun frame assembly (10,

figure 1-2) from case No. 4. Attach fitting end to right

NOTE

side coupling end of main frame assembly, inserting

dowel pin of fitting such that right gun optical frame

Each block assembly contains one or more

curves down ward. Tighten coupling securely using

holes in which the boresight telescopes are

strap or spanner wrench.

mounted for alignment sighting. Each block

and hole is identified by letters and num-

bers. Refer to figure 1-1 to identify block

(8) Remove left gun frame assembly (8) from

case No. 4. Attach fitting end to left side coupling end of

letters.

main frame assembly, inserting dowel pin of fitting

d. Calibration check all boresight telescopes

such that left gun optical frame curves downward.

Tighten coupling securely using strap or spanner

for alignment accuracy by the following method:

wrench.

NOTE

The boresight assembly is now ready for

Check calibration of boresight telescopes

alignment check.

before use in any step in this procedure or

any time that the accuracy of the boresight

Alignment.

2-4.

telescope is suspect or that validity of a

sighting angle measurement is in doubt.

(1) Inspect telescope mounting holes for debris

or foreign material. Clean in accordance with para-

Do not disturb frame during alignment pro-

graph 2-9.

cedure. This will cause erroneous align-

ment.

(2) Install and firmly seat boresight telescopes

in BAGSE movable frame left hand wing block (10,

NOTE

figure l-l) and right hand wing block (17) using holes

marked RWII and LWII (barrel of telescope horizontal

Firmly seat telescope tapered shaft in re-

or vertical to the floor).

ference hole each time telescope is used.

(3) Set main focusing adjustment collar/knob on

The BAGSE alignment check is conducted

each boresight telescope so that the infinity mark (lazy

eight ) is near the focus reference mark ∇ or at the

by inserting the tapered mounting shafts of

the boresight telescopes into pairs of holes,

end of travel in the infinity (long range) direction. Sight

steps 1 through 21 of table 2-1, and by

through the telescope eyepiece and adjust main focus-

checking for alignment within listed toler-

ing collar until the target reticle appears sharply

ances. If any step is not within tolerance or

defined.

cannot be adjusted to tolerance, BAGSE

will be repaired or component will be ship-

(4) To check the alignment of a chosen tele-

ped to higher level maintenance for repair.

scope, place a boresight telescope illumination assem-

bly over the eyepiece of the designated target telescope

a. Remove cable assembly (20, figure 1-2) from

and apply DC power to the lamp. Sight through the

case No. 6. Connect cable to 28 vdc power supply.

sighting telescope and observe the placement of the

sighting reticle center with respect to the target reticle

b. Remove illumination assemblies (12) from case

center.

2-3