SECONDARY SURVEILLANCE RADAR (SSR)

Question 1

The special SSR codes are as follows: emergency …………… , radio failure ……………. , entering UK airspace …………… , unlawful interference with the conduct of the flight …………….

Answer 1

7700 7600 2000 7500

Question 2

Secondary Surveillance Radar is a form of ………….. radar with …………..type emissions operating in the ………….. band.

Answer 2

secondary pulse UHF

Question 3

If the SSR transponder IDENT button is pressed:

Answer 3

an identification pulse is automatically and continuously transmitted for 20 seconds,
4.35μ sec after the last framing pulse

Question 4

When using SSR the ground controller will ask the pilot to cancel mode C if there is a discrepancy of more than …………… between the altitude detected by the radar from the reply pulses and the altitude reported by the pilot read from an altitude with the subscale set to ……………

Answer 4

300 ft, 1013 HPa

Question 5

The SSR code which is appropriate for a UK FIR (inbound) crossing, where no other “squawk” has been allocated is:

Answer 5

2000

Question 6

Secondary radars require:

Answer 6

a target which will respond to the interrogation, and this target may be either an aircraft or a ground based transponder