INTRODUCTION AND GENERAL INFORMATION
Section I. EQUIPMENT DESCRIPTION AND DATA
1-1. Equipment Characteristics, Capabilities, and Features.
a. Purpose. This manual contains the instructions required by the Operator and Aviation Unit Maintenance personnel
to use and maintain the SPH-4B Regular and Extra Large, Flyer's Protective Helmet. The SPH-4B (Figure 1 -1) provides
flight personnel with head, ear, and eye protection and a means for radio communication.
b. Capabilities and Features.
Lightweight design for demanding day and night missions.
Impact-resistant helmet shell.
Polystyrene energy-absorbing liner reduces impact forces.
Inner thermoplastic liner provides a close fit and optimizes comfort.
Adjustable retention assembly provides stability and optimizes fit in the chin and nape.
Rotatable earcups reduce noise and flex to absorb lateral impact.
Integrated communications system.
Visor assembly provides retractable clear and neutral lenses and supports Aviator's Night Vision Imaging
System (ANVIS) Night Vision Goggles (NVGs).