INSTALLATION MANUAL OPERATION MANUAL
KANNAD 406 AS
PAGE 2
JUN 29/2022
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B. World coverage with the COSPAS-SARSAT system
The major improvement is the use of the COSPAS-SARSAT system for
processing aeronautical emergencies.
The difference with the 121.5 / 243 MHz is that the 406 MHz transmission
carries digital data which enable the identification of the aircraft in distress and
facilitate SAR operation (type of the aircraft, number of passengers, type of
emergency).
The 406 MHz message is transmitted to the COSPAS-SARSAT satellites. This
message is downloaded to one of the 64 ground stations (44 LEOLUTs and 20
GEOLUTS).
The aircraft is located by Doppler effect by the LEO satellites with a precision
better than 2 NM (4 km) at any point of the earth.
C. Environmental improvements of ELTs
The certification of an ELT includes a range of severe mechanical tests:
• resistance to flame;
• impact and crush tests;
• resistance to shocks;
• watertightness;
• antideflagration;
• extreme temperatures (-20°C to 55°C for more than 48 hours).
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