Gentex SPH-4B, Сборка

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HELMET SIZING
Helmet size is based upon head circumference as follows:
HEAD CIRCUMFERENCE (INCHES)* HELMET SIZE TPL SIZE
Less than 21.5 Regular Small/regular
21.5-22.4 Regular Regular
Greater than 22.4 X-Large X-Large
*Guidelines only. At times, the next smaller or larger size may be needed for a
satisfactory fit.
HELMET FIT CHECK
1. Don the helmet, tighten the nape strap, fasten the chinstrap, and adjust the
earcups as required. Distance from the eyebrow to the helmet shell should
be approximately 3/4" when the helmet is properly seated on the head. The
earcups can be rotated within the retention assembly to improve the fit to the
ear, if required. Ensure that the ears are centered in the earcups.
2. The earseals should be compressed to the greatest degree possible without
causing discomfort. For maximum earseal compression, the helmet cross
straps can be tightened. Two cross straps are located behind each earcup;
each cross strap has a loop. To tighten the cross strap, insert a finger into
the loop and move the loop toward the bottom of the shell. Don the helmet
and check the fit.
3. If the earseals are not sufficiently compressed when the cross straps are
tightened, earcup spacer pads may be added as required behind each
earcup. Spacer pads may be cut to any size or shape necessary to achieve
maximum compression.
4. Lower the visors to check operation and nose clearance. If either visor does
not move freely, loosen (do not remove) the four screws attaching the visor
housing to the helmet. Move the housing side-to-side as required, and
tighten the screws.
5. Check for hot spots or pressure points. If none are present, remove
the helmet, mark the helmet with crew member’s identity, and store the
helmet as required.
6. If the helmet does not fit properly, i.e. it has hot spots or pressure points or
the fit is too tight or too loose, remove the helmet and custom-fit the TPL
following the TPL Custom-Fitting Instructions on the next page.
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