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Alpha 900 Search and Rescue [SAR] Helmet

Based on the design adopted by the U.K. MoD, and developed in partnership with wet-winch search and rescue aircrew in Bristow Helicopters, the Alpha 900 Search and Rescue (SAR) Helmet System is the world’s first waterproof rotary wing helmet system optimized for any search and rescue aircrew personnel conducting air-to-sea operations. Leveraging the modern and lightweight design of the Alpha 900 Cross-Platform helmet shell, the Alpha 900 SAR features corrosion-resistant hardware, plus a waterproof and salt-fog resistant communications system to ensure continued performance when exposed to water and spray. Optimised for interfacing to common SAR radios and configurable for all major aircraft intercom systems, the Alpha 900 SAR is the ideal solution for aircrew operating near water.




  • Proven Performance
  • Based on the helmet design adopted by the U.K. MoD, the ALPHA 900 SAR continues to meet the impact protection requirements of the Cross-Platform ALPHA 900 Helmet System.
  • Fail-Safe Communications
  • Optimized for air-to-sea search and rescue operations, the ALPHA 900 SAR’s IP67 rated waterproof communications headset prevents failures associated with water and salt fog exposure.
  • Optimal Hearing Protection
  • Offering an additional 2 dB noise attenuation versus the standard ALPHA 900 platform, the ALPHA 900 SAR provides increased protection from low frequency noise associated with rotary wing aircrafts.
  • Withstands Harsh Environments
  • Corrosion-resistant hardware and nape adjustment mechanism preserves the life of the helmet.
  • Replaces U.K. and other Fielded ALPHA helmets
  • The ALPHA 900 replaces the U.K. MoD’s 800 (SAR) ALPHA helmet used by over 65 air forces around the globe.
  • Readily Adaptable
  • Features a watertight communications downlead which can be connected to an aircraft intercom system during transport, and switched to a radio when disembarking from the aircraft.
  • Night Vision Compatible
  • NVG compatible visor housing allows for integration of NVGs or other headborne optical equipment, while the advanced fitting system maintains helmet stability.
  • Customisable
  • Easy order guide enables you to tailor the Alpha 900 SAR to your individual needs.


IP-67 rated to prevent the ingress of dust, and water when immersed to 1 meter depth in water for 30 minutes
Tested in accordance with MIL STD 810F, Method 509.4 Cyclic Salt Mist Test Impact levels not to exceed 300G
Noise attenuation data: 125 Hz = 9.5 dB
250 Hz = 9.5 dB
500 Hz = 21.1 dB
1000 Hz = 25.3 dB
2000 Hz = 37.8 dB
4000 Hz = 43.3 dB
8000 Hz = 43.8 dB980 gram nominal weight, typical configurations weigh between 1150 and 1400 grams


Both comfort and retention are key to selecting the correct size of helmet. Should a head size fit into two options, the smaller size of helmet should be selected wherever possible. If any of the measurements enter the range for the next largest helmet then that is the size that should be selected.

If you are still unsure, there is the option for visiting our facility in West Sussex and having your head measured by a qualified Alpha Helmet specialist, and also to try on the suggested size.

Head Measuring Instructions

1. For measurement [A] use a tape measure around the head in position show.

2. For measurement [B] and [C] a head measuring calliper will be required. These are available from Headset Services Limited on request.

3. For measurements [B] and [C] ensure the callipers are pressed against the skull. Slide the callipers back and forth to locate the maximum measurement.


Ordering Options


Ordering an Alpha Helmet

We make the ordering process of an Alpha Helmet simple. With the help of the specially designed Easy Order Guides showcasing the various options. Our Sales Team are also available to help you make the right choice.


Easy Order Guide for Alpha 900 SAR Helmet

Measuring Sheet for Alpha 900 SAR Helmet

Colours and Textures

The Alpha Helmets are available in an array of different gloss and suede colours.

Hover the mouse pointer over the options below to see how they look.

Gloss White

Gloss Yellow

Gloss Blue

Gloss Red

Suede Blue/Grey

Suede Olive/Green


Optional Extras

HSL is able to offer you something a little extra. From its own Active Noise Reduction to a Bose A20 or David Clark ONE-X headset installed inside an Alpha Helmet. Alternatively, the CEP Interface Kit which offer extra hearing protection.

Find out more about:

Active Noise Reduction

NVG Lip Lights

CEP Interface Kit

Hygiene Parts

Deluxe Helmet Bag

Contact Us


Headset Services Limited
Unit 8, The Quoin Estate
73 Marlborough Road
Lancing Business Park
West Sussex
BN15 8AD
United Kingdom


+44 (0)1273 234 181

Email Address

Opening Hours

Monday: 08:30 - 17:00
Tuesday: 08:30 - 17:00
Wednesday: 08:30 - 17:00
Thursday: 08:30 - 17:00
Friday: 08:50 - 17:00
Saturday: Closed
Sunday: Closed

Let us help you make the right choice.