w. Secure the strap tabs inside the helmet and the back
drill a new hole in the back strap. Do not change the
straps of the helmet sight assembly, using the shortest
position of the hole in the helmet wall.
threaded pin (3, fig. B-2), a washer (2), and a pin collar (1)
on the right back strap and the next-to-shortest threaded
pin (5), loop clamp (4), a washer (2), and a pin collar (1) on
the left back strap. Be sure the cable clamp is positioned as
5-12. Installation of Previously Drilled Helmet Sight --
Assembly onto Previously Drilled SPH-4 Helmet.
x. Permanently tighten all the pin collars (installed in v
and w above).
Perform steps 5-10h through 5-10y. In step 5-10u, a new
hole may have to be drilled in the back strap of the helmet
sight assembly. Do not change the position of the hole in
The pin collars are tightened by holding the
the helmet wall.
inner part of the threaded pin with a hex key
wrench while turning the outer part of the pin
collar until the outer part sheers off and only
the inner collar remains.
5-13. Shim and Wedge Installation.
y. Clean the metal filings and other debris from the
If shim 2202214-00 and wedge 2202213-00 have been
5-11. Installation of previously Drilled Helmet Sight
installed on your helmet sight assembly, these items will
Assembly onto new SPH-4 Helmet.
have been installed as a set and must be maintained as a set.
If the shim and wedge are not installed, gasket 2251744-00
Perform the procedures of paragraph 5-10. The hole in
the back strap of the helmet sight assembly may not line up