Boresighting Procedures (Pilot's Station)

TM 9-1270-212-14&P

aj. Carefully tighten the setscrew on the B1 resolver and

sighting point the number of roils computed as the error.

then recheck the adjustment by repeating steps af through

Then readjust the borescope elevation sighting.

ai.

(2) To lower the TSU LOS, sight through the

ak. While viewing the center target (see fig. 4-7, step D),

borescope and, using the roll adjustment screws, raise the

adjust the GUNNER AZ and EL potentiometers on the

sighting point the number of roils computed as the error.

HSS EIA until the TSU reticle crosshairs coincide with the

Then readjust the borescope elevation sighting.

TSU optics target crosshairs.

ab. Tighten the roll adjustment locking screws, view

al. As a final check, direct the LOD on the TSU to the

through the borescope, and adjust the LOD in azimuth and

three targets to recheck boresight readings at each one.

elevation until the borescope crosshairs coincide with the

crosshairs on the gunner's HSS target. Repeat steps t and w.

4-10. Boresighting Procedures (Pilot's Station).

Then repeat steps o through z until the roll plane is

"flattened" (elevation discrepancies on the left and right

Boresighting of the pilot's station will be done in the

targets have approximately the same value as shown in

same manner as that for the gunner's station with the

figure 4-7, step B).

following exceptions: The ACQ TRK STOW switch (fig.

2-5) shall be in TRK and the PHS ACQ switch must be

pressed in order to slave the TSU to the pilot's helmet

ac. Once the roll plane is "flattened," record the target

sight. Connect the shorting plug to 17P2. For HSS XM136,

elevation discrepancy. This value will be used during pitch

error corrections (see steps ag through ai).

5.5-degree position. Furthermore, do not move the LOD

aft 4 inches for any of the pilot's station checks. Adjust

ad. Reposition the LOD to the forwardmost point of

the PILOT AZ and EL potentiometers on the EIA and view

the gunner's rail, and tighten the T-bars.

the pilot's HSS target on the three targets.

ae. Repeat steps h, t, and u for the center target and

4-11. Post-Alignment and Post-Boresighting Procedures.

compare the value in step u with the value obtained in step

ac. If the total difference between these values exceeds 4

a. Remove borescope and TSU boresight device.

roils, make pitch corrections as given in steps af through ah.

b. Remove LOD from rails, insure that the rail clamp

af. Hold the ACQ TRK STOW switch to ACQ.

base is secured in the 0-degree position, and store the LOD

in the test set.

ag. The technician viewing through the TSU shall

inform the technician in the pilot's compartment of the

c. Place the linkage assembly connectors in the stow

correction to be made at the B1 resolver.

positions.

d. Return control switches to OFF or inactive positions.

ah. Adjust the B1 resolver worm gear until the elevation

discrepancy between the TSU crosshair and the TSU target

e. R e e n e r g i z e circuit breakers used.

crosshair is equal to the elevation discrepancy which was

recorded in step ac (see fig. 4-7, step C).

j. Remove 28-volt external power.

ai. Return the ACQ TRK STOW switch to STOW.

g. Install TSU fairing.

4-11