Figure 4-3. Top view of TSU pitch and roll pads

TM 9-1270-212-14&P

Figure 4-3. Top view of TSU pitch and roll pads

n. Check that all target assemblies are plumb to the TSU

j. Place the right target assembly (foldout FO-11, sheet

boresight device plane within 1/2 degree (8.9 mils) as

3) to the right side of the helicopter and at a distance of

defined by the alignment pads. This is done by placing a

1000 6 inches (83 feet 4 inches, 6 inches) from the

gunner's quadrant on the TSU boresight device, leveling the

reference point marked on the ground, keeping the viewing

bubble, and then transferring the quadrant to the target.

face of the target assembly parallel with the imaginary

For the left and right targets, the gunner's quadrant will be

centerline of the helicopter as much as possible on initial

placed on the TSU boresight device so that it is parallel to

placement.

the centerline of the helicopter. For the forward target, the

gunner's quadrant will be placed on the TSU boresight

k. Sight through the borescope at the TSU borescope

device so that it is perpendicular to the centerline of the

device target.

helicopter. When transferring the gunner's quadrant from

the TSU boresight device to the target, maintain the same

1. With the assistance of a second person to move the

orientation of the quadrant.

right target assembly in azimuth and elevation as directed

by the person viewing the target through the borescope,

o. Once all three target assemblies have been initially

adjust the right target so that the intersection of the TSU

boresight device target is coincident with the intersection of

placed and aligned, insert the borescope in each of the three

the crosshairs of the borescope reticle.

holes in the TSU boresight device again, to verify that each

target is properly aligned in azimuth and elevation as

m. Insert the borescope in the left tapered hole of the

specified in the preceding procedures. These conditions

TSU boresight device. Place the left target (foldout FO-11,

locate the left and right target assemblies at 90 degrees

sheet 1) to the left of the helicopter by performing

from the center target assembly and align the center target

procedures parallel to those in i through l.

assembly with the 0-degree azimuth position of the TSU.

4-5