TCAS

Question 1

How many aircrafts can TCAS track, display and co-ordinate RA:s between?

Answer 1

Track 45
Display 30
Co-ordinate RA:s between 3 aircrafts

Question 2

What is the difference with the Above, Normal and Below settings for TCAS?

Answer 2

Above = 9’900ft above - 2’700ft below
Normal = 2’700ft above - 2’700ft below
Below = 2’700ft above - 9’900ft below

Question 3

Below which altitudes are RA:s inhibited when descending and climbling?

Answer 3

Below 900ft descending and below 1’100ft climbing

Question 4

Which one have higher priority, GPWS or TCAS?

Answer 4

GPWS

Question 5

What should your vertical speed be within 1’000ft of your assigned altitude?

Answer 5

Max 1’000 ft/min

Question 6

What is the normally calculated altitude loss/gain during an RA?

Answer 6

500 ft

Question 7

What is the standard phraseology when having an RA?

Answer 7

Cathay XXX, TCAS RA
Cathay XXX clear of conflict…..returning to FL XXX
Cathay XXX unable, TCAS RA

Question 8

When are aural TCAS aural alerts inhibited?

Answer 8

Below 500 ft

Question 9

What does a hollow diamond indicate on a TCAS display?

Answer 9

Other traffic. More than 1’200 ft vertically and beyond 6 nm

Question 10

What does a filled diamond indicate on a TCAS display?

Answer 10

Proximate traffic. +-1’200 ft and within 6 nm

Question 11

What is the time to CPA for a TA?

Answer 11

20-48 sec

Question 12

What is the time to CPA for an RA?

Answer 12

15-35 sec

Question 13

What frequencies does TCAS use?

Answer 13

Interrogates on 1030 Mhz
Replies on 1090 MHz

Question 14

When are descent RA instructions inhibited during climb and descent?

Answer 14

Inhibited below 1000 ft during descent
Inhibited below 1200 ft during climb

Question 15

What separation, in feet, is an RA trying to achive?

Answer 15

300-700 ft separation

Question 16

What is the max allowed pilot response time for a TCAS RA?

Answer 16

5 seconds

Question 17

When will the vertical trend arrow next to a TCAS aircraft symbol be shown?

Answer 17

When vertical speed exceeds 500 fpm

Question 18

What rate of climb is a TCAS RA requireing?

Answer 18

1500 fpm

Question 19

What is the protection envelope in NM and ALT(ft) for a TCAS TA and RA respectively?

Answer 19

RA: 2,1 nm and 850 ft
TA: 3,3 nm and 1’200 ft

Question 20

What is the reaction time allowed for a TCAS RA reversal instruction?

Answer 20

2.5 seconds

Question 21

Should you turn during an TCAS RA maneuver?

Answer 21

No, unless you are visual and the situation dictates it. TCAS does not support horizontal manurvers

Question 22

Should you follow a TCAS RA below 1000 ft?

Answer 22

No

Question 23

What is the memory items for a TCAS RA when in landing configuration?

Answer 23

A/P OFF
A/T OFF
Call for Flaps 20
Follow RA command
With positive rate of climb, GEAR UP