Gentex SPH-4B, Assembly

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HELMET DESCRIPTION
The SPH®-4B (see Figure 1) is a lightweight, head-protective helmet capable of
supporting Aviator’s Night Vision Imaging System (ANVIS) Night Vision Goggles
(NVGs). The helmet is designed for helicopter crew members performing long
and demanding day or night missions. Equipped with enhanced lightweight
components, the SPH-4B features greater comfort and fit, improved helmet
stability and retention, and increased impact protection in comparison with earlier
SPH helmets. The components include a helmet shell, an energy-absorbing liner,
a preformed thermoplastic liner (TPL®), lightweight contoured earcups, a
lightweight dual visor assembly, a yoke retention assembly, and a
communications system.
This booklet contains a description of the SPH-4B helmet assembly and its
components. Also included are instructions for sizing and fitting the helmet,
custom-fitting the TPL, and modifying the ANVIS mount. A parts list at the end of
the booklet provides information for ordering the helmet and its components.
SPH® and TPL® are registered trademarks of Gentex Corporation.
1
Figure 1. SPH-4B Helmet Assembly
HELMET SHELL
ENERGY-
ABSORBING
LINER
TPL
EARCUP
DUAL VISOR
ASSEMBLY
RETENTION
ASSEMBLY
COMMUNICATIONS
SYSTEM