General 10 ACAS

Question 1

What does ACAS stand for?

Answer 1

Airborne Collision Avoidance System

Question 2

Which equipment is currently the only one capable of meeting ACAS requirements?

Answer 2

TCAS II

Question 3

How long before a collision is a Traffic Advisory (TA) given?

Answer 3

Typically 45 seconds before the assumed collision

Question 4

How long before a collision is a Resolution Advisory (RA) given?

Answer 4

Typically 30 seconds before the assumed collision

Question 5

What are the pilot reactions to a TA?

Answer 5

Do not take avoiding action
Look for conflicting traffic
Request Traffic Information

Question 6

What are the pilot reactions to an RA?

Answer 6

Respond Immediately
Restrict maneuvres to a minimum to avoid secondary RA

Question 7

What is the ATCOs response to a pilot notification of a TCAS RA?

Answer 7

Roger

Question 8

At what height are “descend” RAs inhibited?

Answer 8

Below 1100ft agl

Question 9

At what height are “increase descent” RAs inhibited?

Answer 9

Below 1450ft agl

Question 10

When are all RAs inhibited?

Answer 10

Below 1000ft agl and if a GPWS/Windshear warning is active

Question 11

At what height are all TCAS spoken messages inhibited?

Answer 11

Below 500ft agl

Question 12

Do ACAS RAs require an MOR?

Answer 12

Yes