XM136 Pilot's Rail Alignment

TM 9-1270-212-14&P

(7) Using the serrated cuts in the supports (forward

NOTE

and aft), move the rails to align the borescope reticle with

Take care not to bump the bubble level

the gunner's target.

assembly after it has been adjusted on the TSU

( 8 ) Adjust the position of each support as

boresight device.

follows: Making certain that the serrations in the key

washer are aligned with the serrations in the support,

(2) Attach the LOD to the forward end of the

tighten the nut on the end of the mounting-bracket stud

gunner's rails so that the LOD bubble is forward.

until it is snug. Compress the quick-release plunger (12,

figure B-7) by pressing on the support and continue to

(3) Tighten the T-locks on the LOD T-bars until the

tighten the nut on the stud until the spring tension of the

LOD is firmly attached to the rails.

plunger will not return the support to its original position.

Then loosen the nut enough to have proper operation of

(4) Loosen the roll adjustment locking screw (fig.

the spring plunger.

4-5) and adjust the roll adjustment screw in the support

until the LOD bubble is again centered. Tighten the roll

(9) With the borescope in the LOD, recheck the

adjustment locking screw and recheck the bubble.

azimuth alignment. Remove the borescope.

b. XM128 Pilot's Rail Alignment. Transfer the LOD to

the forwardmost end of the pilot's rails. Insure that the

LOD bubble is at the forward end. Repeat steps a(4)

through (9) above for pilot's rail azimuth adjustment.

c. XM136 Pilot's Rail Alignment.

(1) Remove the LOD from the gunner's rails. Loosen

the LOD azimuth locking knob. Remove the alignment pin

from the rail clamp base, and rotate the rail clamp base

(approximately 180 degrees) until the 5.5 line on the rail

clamp base is aligned with the notch in the swivel plate.

Insert the alignment pin through the hole in the rail clamp

base, making sure that the alignment pin is firmly seated in

its hole in the swivel plate. Firmly tighten the azimuth

locking knob.

(2) Attach the LOD to the forwardmost end of the

pilot's rails. Insure that the LOD bubble is at the forward

end.

(3) Perform steps a(4) through (9).

4-6. Rail Alignment (Roll).

a. Gunner's Rail Alignment.

NOTE

Step (1) below may be omitted if the LOD

bubble has not been disturbed since it was

locked in paragraph 4-5a(2) and if the LOD is

locked in the 0-degree position.

(1) With the LOD locked in the 0-degree position

(paragraph 4-5a(1)) and with the bubble of the LOD facing

forward, place the LOD on the TSU boresight device and

center the bubble. Lock the bubble in place.

Figure 4-5. HSS roil adjustment locations

4-7