TCAS

Question 1

What’s the difference between TCAS I and TCAS II?

Answer 1

Difference is in alerting capability

TCAS I can only give TA:s not RA:s

Question 2

How does TCAS function?

Answer 2

Uses SSR.

Interrogation is done on 1030 MHz and gets replies on 1090 MHz

Question 3

If another aircraft has TCAS II what information will you get?

Answer 3

You will receive TA:s and co-cordinated RA:s

Question 4

What is required for TCAS II to work?

Answer 4

A Mode S transponder

Question 5

Define “Other traffic”

Answer 5

More than 1’200 ft or beyond

Question 6

Define “Proximate traffic”

Answer 6

Within 1’200 ft and 6 nm

Question 7

Define “TA”

Answer 7

20 - 48 sec to CPA

Question 8

Define “RA”

Answer 8

15 - 35 sec to CPA

Question 9

What does CPA means?

Answer 9

Closest Point of Approach

Question 10

How many aircrafts can TCAS:

1. Track
2. Display
3. Co-ordinate RA:s with?

Answer 10

1. Can track 45 a/c
2. Can display 30 a/c
3. Can co-ordinate RA:s between 3 a/c

Question 11

Difference between:
Above
Normal 
Below
setting on the TCAS box?

Answer 11

Above = 9'000 ft above - 2'700 ft below
Normal = 2'700 ft above - 2'700 ft below
Below = 2'700 ft above - 9'000 ft below

Question 12

What reaction time is TCAS based upon?

Answer 12

5 sec reaction time

Question 13

When are RA:s inhibited?

Answer 13

Below 900 ft descending or 1’100 ft climbing

Question 14

Which has higher priority: GWPS or TCAS?

Answer 14

GPWS

Question 15

What are the performance limitations set on RA:s?

Answer 15

Max 500 ft climb or descent and increase of 0,25 G

Question 16

How do you level off to prevent RA:s being triggered?

Answer 16

Max rate of climb 1’000 ft/min

Question 17

When did TCAS 7.1 had to be installed?

Answer 17

By 1st Dec 2015

Question 18

When are all aural TA:s inhibited?

Answer 18

Below 500 ft

Question 19

What is the new feature in TCAS 7.1?

Answer 19

1. RA reversals incase one Aircraft doesn’t follow his instructions
2. Other changes in this version are the replacement of the ambiguous “Adjust Vertical Speed, Adjust” RA with the “Level off, Level off” RA, to prevent improper response by the pilots

Question 20

What will come after TCAS II ?

Answer 20

TCAS III was supposed to use horizontal RA:S
TCAS IV uses additional information encoded by the target aircraft in the Mode S transponder reply (i.e. target encodes its own position into the transponder signal) to generate a horizontal resolution to an RA

ADS-B will take over

Question 21

What is ADS-B?

Answer 21

Automatic dependent surveillance – broadcast (ADS–B)
When using an ADS-B In system, a pilot is able to view traffic information about surrounding aircraft if those aircraft are equipped with ADS-B out