TCAS

Question 1

What does TCAS II provide?

Answer 1

Collision avoidance commands in the pitching plane

Question 2

When is there a requirement for TCAS?

Answer 2

MTOM > 5700kg or more than 19 passenger seats

Question 3

What kind of traffic can TCAS see?

Answer 3

Transponding traffic.

Question 4

What is the envelope for the RA?

Answer 4

15 - 35 seconds.

Question 5

What is the range of a TCAS system?

Answer 5

30nm and plus/minus 2700ft

Question 6

What is the guaranteed range in a high density traffic area?

Answer 6

6NM

Question 7

What is proximate traffic?

Answer 7

non-threatening traffic within 6NM and 1200ft

Question 8

What happens to RAs as radio altitude decreases?

Answer 8

RAs are progressively inhibited.

Question 9

When are all RAs inhibited?

Answer 9

below 1000ft

Question 10

When are RAs that recommend an increase in rate of descent inhibited?

Answer 10

below 1450ft radio altitude

Question 11

When are RAs that recommend a descent inhibited?

Answer 11

below 1100ft.

Question 12

When are all aural commands inhibited?

Answer 12

Below 500ft

Question 13

What is an RA?

Answer 13

A resolution advisory

Question 14

What is a TA?

Answer 14

A traffic advisory

Question 15

What is the crew response to an RA?

Answer 15

Disengage the autopilot and follow the instructions smoothly and promptly.

Question 16

What should the pilot do in the TCAS RA conflicts with the ATC clearance?

Answer 16

Follow the TCAS RA of the purpose of immediate avoidance of danger but inform ATC ASAP

Question 17

What are the typical values of g for “CLIMB, CLIMB” or a “DESCEND, DESCEND”?

Answer 17

0.25g, aiming for 1500ft/min

Question 18

What are the typical values for g for “INCREASE CLIMB” and “INCREASE DESCENT”?

Answer 18

0.35g, aiming for 2500/min to be achieved in 2.5 seconds

Question 19

What are the TCAS inputs?

Answer 19

1) Mode S Replies
2) Radio Altimeter
3) ADC for FL
4) IRU for Attitude
5) Flap Position
6) Landing gear position

Question 20

What must an altitude alerting system do?

Answer 20

1) alert the crew on reaching a certain altitude

2) alert the crew by at least an aural signal when deviating above or below the selected altitude

Question 21

When is no warning given from the altitude alerting system?

Answer 21

Airbus - outside 900ft/ closer than 300ft

Boeing - outside 750ft/ closer than 250ft ..to the selected altitude

Question 22

What happens when you approach a selected altitude?

Answer 22

An altitude alert light comes on

Question 23

What happens when you deviate from a selected altitude?

Answer 23

A light comes on and a tone is sounded

Question 24

What colour is a traffic advisory in a TCAS 2 ?

Answer 24

Yellow/Amber

Question 25

In the case of the remote indicating compass when will the rotor coil have a current induced in it?

Answer 25

It will have a current induced unless it is at 90° to the resultant field by which it is surrounded.

Question 26

What type of gyro is used in a remote indicating compass?

Answer 26

a tied gyro with two gimbals and therefore 2 degrees of freedom, controlled in topple and drift.

Question 27

Summarise acceleration/deceleration errors in Northern and Southern hemispheres

Answer 27

E/W Acceleration: turn towards near pole | E/W Deceleration: turn towards far pole

Question 28

What is the aclinic line?

Answer 28

line of no magnetic dip

Question 29

When are turning errors maximum?

Answer 29

Turning through North or South

Question 30

When are turning errors zero?

Answer 30

Turning through East & West

Question 31

Where would turning errors be worst?

Answer 31

Turning errors are function of dip so will be worst at the poles

Question 32

Where would turning errors be least?

Answer 32

Turning errors are a function of dip so will be least on the aclinic line

Question 33

How do turning errors vary with bank angle?

Answer 33

Turning errors are a function of bank angle so with greater errors at greater bank angles

Question 34

What is the effect of liquid swirl?

Answer 34

Lag (increases lag and decreases lead) in all cases

Question 35

what is parallax error

Answer 35

error caused by reading something from the side, not looking at it directly