High-Noise Integrated Helmet System
The RA315 IHS is a three-part set of solutions adaptable to requirements of vehicle crews, aircraft ground crews, and other operators in high-noise environments with a need for varying levels of head protection.
Its elements include a headset, a ventilated liner, and a choice of optional helmet shells, all available in various colours.
The headset – based on the earshell design of our RA180 Crewgard unit developed for the British Army – is suspended in a ventilated soft liner that provides bump protection when a vehicle is moving over rough terrain.
Liners come in several configurations and sizes and allow headsets to be worn with or without a neckband. In addition, the liner supports a range of hard shells – in “bump only” and ballistic grades – that may be easily added and removed as needed.
Tracked armoured vehicles present particular communication and hearing-protection challenges due to their high-intensity and low frequency drive-train noise, with levels sometimes approaching 120 dB(A).
The mass and volume of the RA315 headset provides passive noise reduction (PNR), particularly effective at higher frequencies, while ANR modules in each earshell give supplementary attenuation at lower frequencies, with overall attenuation of around 35 dB. This combination performs within the requirements of recent noise and safety legislation; for example, the Physical Agents Directive being implemented across Europe.