Boresighting Procedures (Gunner's Station).

TM 9-1270-212-14&P

f. Set the circuit breakers on the dc breaker panel as

NOTE

follows:

The weight of the borescope in the LOD

GEN FIELD to closed (on)

bracket can cause the rails to flex and provide

inaccurate sightings. Therefore, when sighting,

support the weight of the borescope while

DC VOLT METER (or DC VM) to closed (on)

making sure the tapered pin is in full contact

with the borescope bracket.

CAUTION LT (or CAUT LT) to closed (on)

h. View through the borescope and adjust the LOD in

INV MAIN (or [NV) to closed (on)

azimuth and elevation until the intersection of the

crosshairs of the borescope reticle coincides with the

GEN BUS RESET to closed (on).

intersection of the crosshairs of the gunner's HSS target on

the center target.

g. Check that the ELEC PWR EMER OFF switch on the

gunner's left pedestal panel (or gunner's miscellaneous

i. Tighten the azimuth locking knob and the elevation

panel) is set to ELEC PWR.

angle locking knob.

h. Set the electrical power control panel switches as

j. Being careful not to pull or push against the

follows:

borescope in the LOD, recheck the center target alignment

of step h. Remove the borescope.

INV (or ALTNR) to MAIN (or ON)

k. Slightly loosen the setscrew on the B 1 resolver (fig.

BAT (or BATTERY) to ON (RUN)

4-6).

NON-ESS BUS (or NON-ESNTL BU) to NORMAL.

NOTE

4-9. Boresighting Procedures (Gunner's Station).

The B1 resolver is very sensitive to adjustment.

A very slight adjustment results in a large

a. Turn the MODE SELECT switch on the TOW control

displacement in the TSU LOS.

panel to STBY TOW, and set the MASTER ARM switch on

the pilot armament control panel to STBY and the

l. While viewing through the TSU, hold the ACQ TRK

left-hand-grip MAC switch to HI.

STOW switch to ACQ. The technician viewing through the

TSU shall verbally inform the technician in the pilot's

b. Position the gunner and pilot linkage assemblies in

compartment to adjust the B1 resolver worm gear to bring

their respective BIT brackets.

the TSU reticle crosshairs over the TSU optics target

elevation crosshair.

c. Push BIT switch and confirm that the HSS GO light

illuminates.

d. Insure that the LOD rail clamp base is locked in the

O-degree position. Attach the LOD to the forward end of

the gunner's rails with the bubble forward. Tighten the

T-locks on the LOD T-bars until the LOD is firmly attached

to the rails.

e. Attach the gunner linkage assembly to the magnet on

the LOD.

f. Slightly loosen the azimuth locking knob and the

elevation angle locking knob.

g. Insert the borescope in the LOD.

Figure 4-6. 61 resolver adjustment

4-9