Figure 1-2. Test set container

TM 9-4931-363-14&P

Figure 1-2. Test set container

d. The LOD magnet attaches to the linkage arm

c. Two T-bars and T-1ocks secure the rail clamp base to

receptacle. The magnet has an adjustment device that aligns

the linkage rails and, therefore, the LOD to the linkage

the magnet face perpendicular to the centerline through the

assembly. The rail clamp base can be rotated in azimuth to

borescope angle bracket. The borescope angle bracket holds

the leveling base and has two locked positions in azimuth, a

the borescope device in position when sighting on the HSS

position which secures the rail clamp base parallel to the

target.

leveling base (the 0-degree position) and a position in

which it is offset at a 5.5-degree angle. These positions are

1-13. Helmet Boresight Tool.

defined by two lines, marked 0 and 5.5, on the rail clamp

base. The selected line is aligned with a notch on the swivel

The helmet boresight tool has three functions: (1) It

plate and the alignment pin is inserted through a hole in the

provides a means for testing the magnetically operated reed

rail clamp base and into either of two holes in the swivel

switch in the helmet receptacle; (2) it is used for aligning the

plate to hold the rail clamp base in the selected position.

helmet receptacle with the reticle line-of-sight, and (3) it is

The 5.5-degree position is only used for rail-alignment and

used to align the linkage orientation device. The boresight

boresigbting procedures for the pilot linkage in HSS XM136

tool consists of a tube with a small aperture in each end and a

when installed in an AH-1S helicopter. The 0-degree

magnetic connector attached to one end. The magnetic

position is used for all other rail-alignment and boresighting

connector mates with the helmet receptacle; consequently,

procedures. The elevation angle of the rail clamp base can

the line of sight through the tool is perpendicular to the

also be adjusted by the swivel frame and locked into

mating surface of the receptacle magnet.

position.

1-4