Page 29 - Radiooperatør - BEG-2024

So the old system shown here does not provide good opportunities to safely

identify aircraft and what altitude they are at. If we did not have a transponder

in the aircraft, we would be just a dot on a radar screen.

But fortunately we are not, after we have had our wallets opened and sacrificed

what is necessary to be able to operate safely, and to some extent secure

ourselves against other traffic in cooperation with the air traffic service.

When we turn on the transponder and turn on ALT (altitude), it looks like the

picture here:

Now TWR is sure of our position and he can

see our flight altitude, so we can get safe

information during the flight.

A basic transponder that just sends the 4

numbers we have set is called a MODE A

transponder.

If we have to fly through busy airspace where there is a lot of traffic, the airspace

is upgraded to C airspace (which is the most restrictive we have in Denmark),

then there is a requirement that we must have a transponder with MODE C, as it
is called, when it broadcasts our altitude.

3.2.1 Transponder codes – and operation

If Tower has trouble figuring out where we are, he can ask us to “SQUAWK
IDENT”. This means that we have to press the transponder button at the top left

once. It causes our signal to flash on the screen, and then the Tower can easily

see where we are.

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