Page 437 - PPL BEG-engelsk

Communication

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

Each “dijuuuuu” is called a sweep.

The signals can also be picked up by special satellites that make precise

measurements of the transmitter’s position and transmit this 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 impact or ingress of water.

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.

The frequencies used in the emergency transmitters are the international

emergency frequency 121.5 MHz and / or 243.0 MHz and in certain cases,

where there is a satellite monitoring system, 406 MHz.

4.14.1 Testing the emergency transmitter

Turn on the flight radio and tune to 121.5 MHz (the only frequency we can test).

Then activate the emergency transmitter manually and hear if it is ok.

It is ok if you hear the siren sounds emitted.

TESTING OF EMERGENCY TRANSMITTERS:

1. Must be performed within the first 5 minutes of each hour.
2. Must last no longer than 1 second or 3 sweeps.

3. Must be performed on the ground

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© marts 2026 437