Section Ill. PRINCIPLES OF OPERATION
1-12. General. This section describes the function and operation of each of the compo-
nents listed in the previous section.
Helmet Shell (Figure 1-4). Constructed of graphite and polyethylene, the helmet shell
protects the head from impact and sharp objects.
Figure 1-4. Helmet Shell
Lining, Helmet, Shock (EAL) (Figure 1-5). The polystyrene lining, helmet, shock
(EAL) (1) absorbs and reduces impact forces. Cutouts and channels in the liner allow
space for internal components. The lining, helmet, shock (EAL) is attached to the in-
side of the helmet shell via hook-and-pile fastener.
Lining, Helmet, Shock (TPL) (Figure 1-5). The lining, helmet, shock (TPL) consists of
molded polyvinyl acetate sheets (2) attached to a removable, washable, cloth cover
(3).The preformed lining, helmet, shock (TPL) will fit most head shapes. If neces-
sary, the lining, helmet, shock (TPL) can be heat-softened and custom-fitted (refer to
Chapter 4 for procedures). The lining, helmet, shock (TPL) is attached to the inside
of the lining, helmet, shock, EAL via hook-and-pile fastener.
Figure 1-5. Lining, Helmet. Shock (EAL/TPL)