The HSL Active Noise Reduction (ANR) kit is suitable for installation into the Alpha Eagle, Alpha 400 (Multi-Fit) and Alpha 900 helmets. The ANR modules replace the standard earphones and a new loom (downlead) is installed as well. The original passive performance of the helmet as well as the fit of the helmet are unaffected by the installation of the ANR system.
The HSL ANR Kit offers approximately 12dB of extra attenuation whilst retaining the passive attenuation and fit of the original helmet. The system is available with coiled or straight downlead which is terminated with either a Bose-style 6 Pin Lemo, or a 7 or 8 Pin Lemo Plug, and can be powered by the HSL Rechargeable Battery Box or directly from the aircraft's panel. If the ANR system is turned off or the power to the system is interrupted for example by batteries running down then the system will revert to a comms only failsafe and passive protection level of the standard helmet. It is recommend that Gel Ear Seals are fitted during the install as they provide a better seal around the ear and enhance the performance of the ANR.
The HSL Rechargeable Battery Box has a sleek design and connects to the Lemo connector providing an approx. 50 hours of operational use. There is a green LED light which shows when the battery box is supplying power to the ANR system within the Alpha helmet. The ON/OFF switch has a lockable feature, whilst the volume control is positioned at the top and allows the user to easily increase and decrease the sound through the Alpha helmet earcups.
The body of the fire retardant battery box has environmental NiMh battery packs and is fitted with a convenient belt clip which allows the user to attach the box to just about any pocket, belt or waistband for easy carry and added security against dropping. The battery box can be charged through the Lemo connector with one of our specially designed mains charger. The recharging time would be approx. 10 hours from fully discharged.
Available with UK NATO Plug, US NATO Plug or Twin Plugs.
HSL can offer a range of Looms (also referred to as Downleads or Cable Assembly) with various different lengths from 450mm to 1.5 metres, straight or coiled with a variety of plug types.
Waterproof looms are also available and ideally designed to work with a wet-winchman Alpha helmet. The high quality loom comes complete with connections for waterproof speakers and microphone and has a coiled cable with a Fischer plug.
Our General Aviation and Search & Rescue adaptors are made to the highest quality by our highly skilled technicians with approved components. We offer a complete range of waterproof adaptors such as Lemo Socket to U174 Plug, Ficsher Socket to UK NATO Plug and U174 Socket to Fischer Plug. We can also offer bespoke solutions where off-the-shelf products fall short. From coiled and straight cable extension leads with an array of plugs and sockets to adaptors with required lengths of cable.
Headset Services Limited
Unit 8, The Quoin Estate
73 Marlborough Road
Lancing Business Park
+44 (0)1273 234 181
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