Page 88 - Radio BEG-engelsk- engelsk tekst

© Henning Bach Andersen

12. Emergency radio equipment

As a rule, emergency radio equipment in an aircraft consists only of a battery-

powered transmitter.

The transmitter is activated either manually or automatically if it is exposed to

strong shocks such as from a crash or a hard landing.

If it is exposed to moisture or water, it also starts working.

Emergency transmitters send a signal that can be located by rescue personnel
and which can be heard if we tune to the emergency frequency 121.5 MHz.

In a loudspeaker, the signal will sound like “dijuuuuu dijuuuuu dijuuuuu” etc.

Each “dijuuuuu” is called a sweep.

The signals can also be intercepted by special satellites that make precise

measurements of the transmitter’s position and pass this on to a ground station.

Types of emergency radio equipment include:

- ELBA Emergency Location Beacon Aircraft

- ELT Emergency Location Transmitter. A type of ELBA that is

automatically activated by shocks or water ingress.

Both types of ELBA must be able to transmit for at least 48 hours.

- SARBE Search and Rescue Beacon. Primarily used by the military.

- EPIRB Emergency Position Indicating Radio Beacon. Primarily used by

shipping

- PLB Personal Locator Beacon. A handheld emergency transmitter.

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