Rail Alignment (Azimuth).

TM 9-1270-212-14&P

NOTE

4-5. Rail Alignment (Azimuth).

Take care not to bump the bubble level

For HSS XM128 (an HSS in an AH-lS(Mod) helicopter),

assembly after it has been adjusted on the TSU

perform the procedures in a and b below; for HSS XM136

boresight device.

(an HSS in an AH-lS

helicopter), perform the pro-

cedures in a and c below.

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

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

end.

a. Gunner's Rail A Alignment.

(4) Tighten the T-locks on the T-bars of the LOD

(1) Lock your LOD in the O-degree position as

until the LOD is firmly attached to the rails.

follows (fig. 4-4): Loosen the azimuth locking knob, and

rotate the rail clamp base until the 0 line on the rail clamp

(5) Insert the borescope in the LOD borescope

base is aligned with the notch in the swivel plate (mounted

bracket future and adjust the LOD in elevation until the

on top of the swivel frame). Insert the alignment pin in the

gunner's HSS target on the center target is visible. Check

hole in the rail clamp base, making sure that the alignment

that the intersection of the vertical crosshairs of the

pin is firmly seated in its hole in the swivel plate. Firmly

borescope reticle coincides with the intersection of the

tighten the azimuth locking knob.

vertical crosshairs of the gunner's HSS target.

(6) If azimuth adjustment is required, loosen the

(2) With the bubble of the LOD facing forward,

nuts on the linkage rail mounting-bracket studs (the nut

place the LOD on the TSU boresight device and center the

below each of the linkage supports).

bubble. Lock the bubble in place.

Figure 4-4. Linkage orientation device

4-6