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ACAS and TCAS > ACAS and TCAS > Flashcards

ACAS and TCAS Flashcards

1
Q

What is ICAO ACAS II SARPS mandate?

A

Carriage and operation of ACAS II equipment by all fixed wing turbine engined aircraft having a MTOM exceeding 5700kg or a max approved seating confit of more than 19 seats

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2
Q

What aircraft must comply with ICAO ACAS II SARPS?

A

Fixed wing turbine

MTOM exceeding 5700kg

Max seating configuration of more than 19 seats

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3
Q

What Aircraft can be exempt from ACAS II

A

Certain civil registered historical and ex military aircraft

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4
Q

What equipment is available to meet ACAS II requirements

A

TCAS II

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5
Q

What does ACAS stand for

A

Airborne collisions avoidance system

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6
Q

What is ACAS

A

An aircraft system based on SSR transponder signals which operate independently of ground based equipment to provide advice to the pilot on potential conflicting traffic that are equipped with SSR transponders

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7
Q

What does TCAS stand for

A

Traffic Alert and Collision Avoidance System

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8
Q

What is the difference between TCAS I and TCAS II

A

TCAS I did not issue a resolution Advisory

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9
Q

How does TCAS II obtain range and altitude data and what does it use this data for?

A

Obtained by interrogating other Aircraft transponders

This info is used to determine possibility of collision

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10
Q

Is TCAS II able to present bearing j formation of aircraft intruding into aircrafts airspace

A

Yes but this Information is used on the display only to assist in visual acquisition of an intruder

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11
Q

What type of avoidance manoeuvres does TCAS II give?

A

Vertical only

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12
Q

Why can TCAS II not give horizontal avoidance manoeuvres

A

Because the bearing info produced does not possess the accuracy necessary for determining a horizontal manoeuvre.

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13
Q

What Info can be given regarding Mode A/C transponders

A

Can give both traffic advisory and resolution advisory but only if Mode C available.
Manoeuvres may not be in the logical sense

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14
Q

What use are Mode S transponders to TCAS II

A

They can communicate with each other and agree a course of action

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15
Q

TCAS depends entirely on SSR therefore…..

A

No transponder no TCAS alert

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16
Q

What surrounds ACAS II equipped aircraft?

A

A protected volume of airspace

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17
Q

What does the size of protected airspace surrounding ACAS II equipped aircraft depend upon?

A

The altitude, The speed And The heading of the aircraft involved in the encounter

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18
Q

How is non-altitude reporting traffic shown on TCAS display

A

Outline of a diamond in white

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19
Q

What is non altitude reporting traffic

A

Traffic that TCAS has no way of determining whether a threat as No Mode C data is being transmitted

20
Q

How is non threat traffic displayed on TCAS display

A

Outline white diamond with a - and a number as well as an arrow showing if climbing or descending

21
Q

How is proximity traffic shown on TCAS display

A

A white diamond (filled in) will show level and whether climbing or descending

22
Q

What is proximity traffic and how is it shown on TCAS display

A

Any target within 6nm and wishing 1200ft

Shown as filled in white diamond

23
Q

What is a traffic advisory and when will it appear on TCAS display

A

When traffic assumes threat status

20-48 seconds before closest point of approach (CPA)

24
Q

How is a traffic advisory (TA) shown on TCAS display and what aural warning will be heard

A

Appears as yellow circle

Aural warning = traffic traffic

25
Q

Should pilots take avoiding action on traffic advisory

A

Advised not to take avoiding action.

May request traffic information

26
Q

What is a resolution advisory (RA)

A

Starts the conflict resolution process

Up to 35 seconds before closest point of approach

27
Q

How is an RA shown on TCAS display and what aural warning will sound

A

Appears as red square

Aural warning = climb, climb now

28
Q

What should a pilot do when a resolution advisory appears on TCAS display

A

Respond immediately

Disengage autopilot and respond within 5 seconds unless doing so would jeopardise the Aircraft

Advise ATC ASAP

29
Q

What should pilot do when an RA has been resolved

A

Return to original flight path as soon as safe to do so

30
Q

What is a limitation of enhance RA “increase descent”

A

It is inhibited below 1450ft AGL

31
Q

What RA is inhibited below 1100ft AGL

A

Descend RA

32
Q

What height are Descend RAs inhibited below

A

1100ft AGL

33
Q

What height are all RAs inhibited below

A

1000ft AGL

34
Q

What RAs are inhibited below 1000ft AGL

A

All RAs

35
Q

What Is inhibited below 500ft AGL

A

All spoken messages

36
Q

What height are all spoken messages inhibited below

A

500ft AGL

37
Q

What other reasons can RAs be inhibited

A

When some Ground proximity warning systems or windshear warnings are active

38
Q

When GPWS or windshear warnings are active what can this do to RAs

A

Inhibit them

39
Q

What are nuisance advisories

A

RAs and TAs that occur even though standard separation exists

40
Q

What are the frequent causes of nuisance advisories

A

High vertical speed - particularly at low level and in congested airspace

Ground testing of transponders

41
Q

What should ATC do when notified of RA

A

Do not issue instruction to aircraft

Cease responsibility for standard separation

42
Q

Should ATCO pass traffic info to aircraft conducting RA manoeuvres or to other aircraft affected by such manoeuvres?

A

No

Not unless asked by pilot

43
Q

When should ATCO resume responsibility for providing separation for aircraft affected by RA

A

When the ATCO acknowledges report from flight crew that aircraft has resumed the current clearance or

The ATCO acknowledges a report from flight crew that aircraft is resuming current clearance and issues an alternative clearance which is acknowledged by the flight crew

44
Q

Do ACAS RAs need to be reported?

A

Yes - report under MOR scheme

45
Q

If a controller has filed an MOR are they still required to report an AIRPROX?

A

Where appropriate an AIRPROX still needs to be reported

46
Q

What is non threat traffic

A

A common display situation - usually with multiple contacts

ACAS and TCAS (1 decks)

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