Concept Of Use: The helmet is intended to provide US Armed Forces
Aircraft crewmen with crash protection, noise attenuation and communication capability.
Description Of Item: The SPH-4 helmet consists of a hard
shell with an expanded plastic foam lining. It has an adjustable
sling suspension with a chin and nape strap retention assembly.
The helmet incorporates a retractable visor, communications
equipment, noise attenuating ear cups and can accommodate an
oxygen mask.