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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
Should pilots take avoiding action on traffic advisory
Advised not to take avoiding action. | May request traffic information
26
What is a resolution advisory (RA)
Starts the conflict resolution process Up to 35 seconds before closest point of approach
27
How is an RA shown on TCAS display and what aural warning will sound
Appears as red square Aural warning = climb, climb now
28
What should a pilot do when a resolution advisory appears on TCAS display
Respond immediately Disengage autopilot and respond within 5 seconds unless doing so would jeopardise the Aircraft Advise ATC ASAP
29
What should pilot do when an RA has been resolved
Return to original flight path as soon as safe to do so
30
What is a limitation of enhance RA “increase descent”
It is inhibited below 1450ft AGL
31
What RA is inhibited below 1100ft AGL
Descend RA
32
What height are Descend RAs inhibited below
1100ft AGL
33
What height are all RAs inhibited below
1000ft AGL
34
What RAs are inhibited below 1000ft AGL
All RAs
35
What Is inhibited below 500ft AGL
All spoken messages
36
What height are all spoken messages inhibited below
500ft AGL
37
What other reasons can RAs be inhibited
When some Ground proximity warning systems or windshear warnings are active
38
When GPWS or windshear warnings are active what can this do to RAs
Inhibit them
39
What are nuisance advisories
RAs and TAs that occur even though standard separation exists
40
What are the frequent causes of nuisance advisories
High vertical speed - particularly at low level and in congested airspace Ground testing of transponders
41
What should ATC do when notified of RA
Do not issue instruction to aircraft Cease responsibility for standard separation
42
Should ATCO pass traffic info to aircraft conducting RA manoeuvres or to other aircraft affected by such manoeuvres?
No Not unless asked by pilot
43
When should ATCO resume responsibility for providing separation for aircraft affected by RA
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
Do ACAS RAs need to be reported?
Yes - report under MOR scheme
45
If a controller has filed an MOR are they still required to report an AIRPROX?
Where appropriate an AIRPROX still needs to be reported
46
What is non threat traffic
A common display situation - usually with multiple contacts

ACAS and TCAS (1 decks)

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