General 6 Surveillance Systems

Question 1

What should an ATCO do if a pilot requests deviation due to weather?

Answer 1

• Accommodate such requests, taking into account the prevailing traffic situation
• Request the pilot to report when able to accept vectors back on-track
• If the ATCO cannot accommodate, a reason should be given and an alternative clearance offered

Question 2

What should an ATCO do if weather deviation will take a pilot out of controlled airspace?

Answer 2

• Inform the pilot of this and offer an appropriate service
• Issue a clearance to rejoin as required

Question 3

Describe the methods of SSR identification

Answer 3

• Observing the pilot’s compliance with the instruction to select a discrete four-digit code
• Recognising a validated four-digit code previously assigned to an aircraft callsign
• Observing an IDENT

Question 4

What are the three emergency squawk codes?

Answer 4

7500 - Hijack
7600 - Radio Failure
7700 - Mayday