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Pulse Class > Traffic Collision Avoidance System (TCAS) > Flashcards

Traffic Collision Avoidance System (TCAS) Flashcards

1
Q

What is the purpose of TCAS?

A

To prevent mid air collisions

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2
Q

Does the TCAS need ground stations to function?

A

TCAS is independent from the ground

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3
Q

What is TCAS based on?

A

SSR transponder signals and mode S

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4
Q

What does TCAS 1 give us?

A
  • monitors traffic 40miles around the plane
  • bearing and altitude
  • can give a Traffic Advisory warning
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5
Q

Can TCAS 1 give Resolution Advisories?

A

TCAS 1 cannot give resolution advisories it is all up to the pilot

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6
Q

Which version of TCAS is mostly used in commercial aviation?

A

TCAS 2

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7
Q

What improvement does TCAS 2 have from TCAS 1?

A

TCAS 2 can give Resolution Advisories

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8
Q

What is Preventative RA?

A

To tell pilots not to deviate from their current vertical speed

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9
Q

What does CPA stand for?

A

Closest Point of Approach

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10
Q

Is TCAS based on time?

A

Yes

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11
Q

What improvement does TCAS 3 have over TCAS 2?

A

Gives TA/RA with horizontal and vertical maneuvers (turn right climb/turn left descend)

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12
Q

Which TCAS version uses mode S for additional info in the transponder reply?

A

TCAS 4

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13
Q

How does TCAS 4 help generate a horizontal resolution to the RA?

A

TCAS 4 encodes its own position

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14
Q

What are the possible on board equipment of TCAS?

A
  • Dedicated instrument
  • VSI
  • PFD/MFD
  • EHSI
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15
Q

What happens in Standby mode?

A
  • TCAS does not interrogate
  • transponder only responds to discrete
  • used on ground, outside of runway
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16
Q

Which mode does the transponder reply to all ground and TCAS interrogations but the TCAS is still on stand by?

A

Transponder mode

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17
Q

What happens in Traffic Advisory mode?

A
  • Issues proper interrogations and performs all tracking functions
  • Only TA, no RA
18
Q

Which mode is TA and RA active and is mandatory for commercial aviation?

A

Automatic

19
Q

The aircraft interrogates at which frequency?

A

1030MHz

20
Q

Is a mode C or S needed for TCAS?

A

Yes

21
Q

How do you get distance?

A

The time it took from interrogation and response

22
Q

How do you get altitude?

A

Reported by the interrogated aircraft (mode C or S)

23
Q

How do you get the bearing?

A

Using the directional antenna

24
Q

How many targets can the TCAS keep track of?

A

30 targets

25
Q

If the symbol is a white/cyan diamond thats not coloured in, what is it?

A

Non-threat

26
Q

What symbol and colour is a proximate traffic?

A

Coloured in white/cyan diamond

27
Q

What does a yellow/amber circle signify?

A

Intruder, TA, 40s away

28
Q

What symbol is shown if an aircraft is 25s away and an RA is given?

A

Red square

29
Q

How does TCAS auto negotiate a mutual avoidance maneuver?

A

Using mode S transponder

30
Q

Which has priority, TCAS RA or ATC?

A

TCAS RA

31
Q

Are both mode S antennas directional or omnidirectional?

A

Directional

32
Q

Is the bottom TCAS antenna only directional?

A

No it can be omnidirectional

33
Q

What is the purpose of the Whisper Shout Technique?

A

To reduce synchronous garble

34
Q

How does the Whisper Shout Technique work?

A
  • Talk to nearby airc. first then sending a specific P2 pulse in the next Tx so they don’t reply
  • Low power first, then at 24/s max power of 250W
35
Q

What is our sensitivity level at 5000-10000ft?

A

SL at 5

36
Q

What is the TAU TA and RA?

A

TA=40s

RA=25s

37
Q

What is DMOD and what are the TA and RA?

A

DMOD is the slow encroachment of an aircraft behind or beside you
TA at 0.75NM
RA at 0.55NM

38
Q

What is the Altitiude threshold above and below the aircraft?

A

TA is 850ft above and below

RA is 600ft above and below

39
Q

During mode S surveillance, the extended squitter interrogation happens every how many seconds?

A

Every 5s and increases once per second the closer it is

40
Q

Does mode S surveillance need directional antenna to get bearing and distance?

A

No it does not need the directional antenna to get bearing and distance

Pulse Class (6 decks)

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