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HAS457-2 Helicopter Antenna System 457kHz
Helicopter Based Search of Avalanche Victims

The professional system HAS457-2 provides a very fast search by helicopter for persons who have been buried in an
avalanche, provided that the persons are carrying an avalanche transceiver.
The primary use is with large avalanches, in case of danger of secondary avalanches or other objective dangers.
The system is also very advantageous for searching for missed persons on any kind of terrain such as avalanches, crevasses,
forests, gorges or other inaccessible areas.

The system features an omnidirectional antenna that will receive signals from transceivers from all directions with equal sensitivity. For performing a search, the antenna is suspended a few meters below the helicopter in order to avoid any interference from the electromagnetic signals emanated by the helicopter.
For searching a signal, the helicopter flies over the search area according to procedures as specified. The ensuing coarse search uses the classical method of bracketing on two orthogonal axes. Once a transceiver has been located, the spot is marked with a flag (heavy object with marker band attached) and a rescuer is lowered by means of the winch or exits to ground for performing a fine search.

The HAS457-2 is only used temporarily, there is no need for permanent installation or modifications to the helicopter. The system must be stored in the helicopter during the winter season. The complete system, ready for use, is stored in a special bag and can be deployed within a very short time.

Main Features

• Reduction of search time

• Better safety for the rescue squad

• Reduction of the cost of rescue

• Higher chances of survival for buried persons

• Large width of search strip

• Classical orthogonal search procedure (bracketing)

• Active omnidirectional antenna

• Battery operation

• Galvanically separated and adjustable connection to the intercom system

• Compatible with all avalanche transceivers (EN 300718)

• Professional and robust construction

• Professional connectors

• Easy to use, immediately deployable

• Robust aluminum case for the receiver providing shock protection

• Optical (20 LED bar) received signal strength indicator

• Three level sensitivity adjustment

• Integrated 3 level intercom impedance adjustment with level control

• Additional earphone connectors with level control

• Safety through panic hook on the antenna cable

• Antenna cable protected by Polypropylene tubular webbing

• Robust transportation bag providing overall shock protection and reinforced bottom

• Compatible with the current system

• Developed and manufactured in Switzerland

• Successful use all over the world

Development History


The Current System

The first helicopter based system for the search of avalanche victims that was
using an omnidirectional antenna was developed and marketed by Girsberger
Elektronik AG in the year 2000. It was first designated the VS2000 Pro and later
on renamed to HAS457.
The system as proved very effective with many rescue organizations all over the
world and has saved many lives.

The New System 2018

In the year 2015 we decided to do a re-development of the entire system.
The focus was put on increasing the search efficiency by means of an optical
distance and direction information as well as on extending the range.
Various studies, hardware and software developments and extensive field tests
showed that the development effort would become exorbitant, that the system
would require certification due to the installation of fixed hardware in the
helicopter, that an additional device (tablet computer) would be required for
control and display, that the range would be reduced, that the maintenance of
the software would require a considerable effort and that the final system cost would be very high. Based on these insights, we decided in 2017 to not change to a digital system but keep the analog system. The new receiver provides an optical signal strength indicator that will support the search and will also help in identifying interferers and performing a functional test.
Over all, the system has become more compact, provides an increased range and various new useful details that will be described in the following.

Helicpter AgustaWestland Da Vinci, Personensuche, Verschüttetensuche

Wanaka Alpine cliff rescue, New Zealand  have recently purchased for our winter SAR responses the HAS457-2. This installs easily (quick and made so you can't plug it in wrong) into our B2 and B3 squirrel eurocopters that we use for SAR.  Our SAR pilots......  
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Gary Dickson IFMGA Mountain Guide/Wanaka Alpine Cliff Rescue team leader

HAS457-2 user manual and technical data

Recco Detector

The professional passive ICS impedance adapter enables an impedance matching as well as an electrically isolated connection of the RECCO Detector R8 & R9 to the Intercom (ICS) of a helicopter.
Interference and hum loops are avoided by the separated ground.
The adapter has a trimming potentiometer for level adjustments. The adapter is available for both civil and military intercom systems, as well as a customer-specific version.

Air Glacier - Switzerland
Air Zermatt - Switzerland
CNSAS Dolomiti Bellunesi - Italy
CNSAS Friuli Venezia Giulia - Italy
CNSAS Lomardo - Italy
Elitellina SRL - Italy
Flugrettung Südtirol / Weisses Kreuz - Italy
Juneau Mountain Rescue - USA
LT Tech AS - Norway
Norsk Luftambulanse - Norway
Norwegian Armed Force  - Norway
ÖAMTC - Austria
PGHM - Chamonix-Mont-Blanc - France
REGA - Switzerland
Search & Rescue - New Zealand
Supervisor Teton Country - USA
Wanaka Alpine Cliff Rescue - New Zealand

Aiut Dolomit, Gröden , Helicopter, Personensuche, LVS Suche, Avalanche Rescue
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