Secondary Surveillance Radar (SSR)

Question 1

What is SSR comprised of?

Answer 1

• ground based interrogator
• airborne transponder

Question 2

What are the different modes of operation?

Answer 2

Mode A - identification

Mode C - altitude

Mode S - addressing and flight data

Question 3

What are the increments of Mode C replies?

Answer 3

100ft

Question 4

What are the Mode S increments?

Answer 4

25ft

Question 5

What are the Mode S interrogations?

Answer 5

• specific a/c address
• all call
• selective surveillance calling (roll call)