ALPHA 400 Helmet – Sales and Support

The ALPHA 400 Series multi-fit passenger helmet.

Gentex/HISLs ALPHA 400 has been designed specifically for passengers, casual users and is the ideal choice where ease of fit is critical (e.g. EMS paramedics & observers).


The ALPHA 400s flexible design makes it ideal for passenger use in helicopters and fixed winged static seat aircraft.

The helmet is easy to don and doff, it features a unique multi fit system that is easily adjusted to fit a wide range of head sizes.

The Helmets modular design makes it easy to maintain, and the ALPHA 400 is compatible with multiple platforms.

ALPHA 400 is the ideal helmet for situations where the helmet is not a frequently used personal item, the multi fit system provides any passenger with leading head protection from impact and penetration.

The helmet shares the same superior noise attenuation as the rest of the ALPHA helmet line up, its single (or twin) visor system offers outstanding optical clarity and an uninterrupted field of view.

The ALPHA 400 provides  superb head protection combined with comfort and excellent retention.

View ALPHA 400 Series product literature

Helmet Maintenance/Repair Form


User adjustable features:  

  • Fore/aft tension
  • Brow/crown comfort pads
  • Ear capsule tension
  • Chin strap tension
  • Visor height
  • Boom microphone.

The ALPHA 400 is ideal for use by commercial/military passengers, EMS, paramedics, doctors/nurses and for staff transport (i.e. oil rig/remote workers).

Various configurable options and after market accessories are available for the ALPHA 400, and here at Key Survival Equipment we can supply you with ALPHA 400 helmets built to your specifications and can then provide you with after-sales service and support, ensuring your helmet is inspected and maintained to the manufacturers recommended schedules.

Utilise our knowledge of aircrew equipment, pilot flight equipment and survival equipment to keep your valuable assets safe!