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Instruments & Aids > ILS > Flashcards

ILS Flashcards

1
Q

ILS

A

Instrument Landing System

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2
Q

An ILS provides precise ____________ and ___________ guidance

A
  1. Azimuth
  2. Glide slope
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3
Q

The minima of an ILS will be:

A

a Decision Height (DH) or Decision Altitude (DA)

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4
Q

Visibility and Height minima for ILS Cat 1?

A

Vis: 800m
Height: Not below 200ft

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5
Q

Visibility and Height minima for ILS Cat 2?

A

Vis: 350m RVR
Height: Not below 100ft

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6
Q

Visibility and Height minima for ILS Cat 3A?

A

Vis: 200m RVR
Height: Below 100ft or 0

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7
Q

Visibility and Height minima for ILS Cat 3B?

A

Vis: 50m RVR
Height: Below 50ft or 0

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8
Q

Visibility and Height minima for ILS Cat 3C?

A

Vis: 0
Height: 0

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9
Q

What are the components of an ILS?

A
  • Localiser transmitter & aerials
  • Glide slope transmitter and aerials
  • DME
  • High Intensity Approach Lighting (HIAL)
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10
Q

The localiser provides ___________ guidance

A

azimuth

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11
Q

The glide path provides __________ guidance

A

vertical

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12
Q

Where is the localiser aerial located?

A

Upwind on the extended centreline

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13
Q

The localiser carries the _________ ident

A

morse

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14
Q

A localiser sends out two overlapping signals. What are they?

A
  • 150Hz tone right of the runway (blue zone)
  • 90Hz tone left of the runway (yellow zone)
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15
Q

Where is the glide path aerial positioned?

A

Adjacent to the aiming point.

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16
Q

What is the frequency range of the glide path?

A

329 MHz to 335 MHz

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17
Q

What is the frequency range of the localiser?

A

108MHz to 112 MHz

18
Q

Based on 3° Glide Path an aircraft will lose ____________ per NM travelled.

A

approx 300ft (more like 318) per NM travelled.

19
Q

Of the two signals sent by a glide path, which is the higher (vertically)?

A

90Hz

20
Q

Of the two signals sent by a glide path, which is the lower (vertically)?

A

150Hz

21
Q

DME may be associated with an ILS to provide a pilot with what?

A

A cross-check of height/distance-to-run

22
Q

Where is ILS DME typically located?

A

With the glide path.

23
Q

Where no DME is associated with an ILS what can be used instead?

A

GNSS

24
Q

What may be located prior to the ILS procedure Initial Approach Fix (IAF)?

A

An NDB.

25
Q

Flying over the NDB prior to the IAF ensures what?

A

That the correct localiser beam is intercepted.

26
Q

What is the purpose of HIAL?

A

High Intensity Approach Lighting is designed to assist a pilot in transitioning from flight in IMC to visual conditions

27
Q

Which categories of ILS require HIAL?

A

CAT 2 & CAT 3

28
Q

What is a marker beacon?

A

A low powered NDB that shoots a signal upwards in a vertical cone.

As an aircraft passes over, lights go off in the cockpit to tell the pilot where they are.

29
Q

GBAS

A

Ground Based Augmentation System

30
Q

How does GBAS work?

A
  1. A GPS receiver is placed at a surveyed geographical position
  2. The position received from the GNSS is compared with the known position and a correction is applied
  3. Differences are relayed via VHF datalink to aircraft
  4. Aircraft GPS compensates for errors
31
Q

How accurate is GBAS?

A

Can be as accurate as 10cm

32
Q

What does GBAS enable?

A

Precision approaches based on GPS

33
Q

How should HIAL be operated?

A

a) select initial intensity in accordance relevant table
b) vary settings in accordance with pilot requests; and
c) advise pilots when equipment is operating in visibility of 5000 m or less.

34
Q

How does NDB failure impact ILS approach?

A

Aircraft must join the ILS outside the outer marker as directed by NOTAM or ATC

35
Q

How does Glide Path failure affect ILS approach?

A

Only localiser procedure is available

36
Q

How does Marker Beacon failure affect ILS approach?

A

Aircraft may use the ILS if the alternate fixes nominated on the IAL chart or by NOTAM are used for altimeter checks

37
Q

How does GBAS failure affect ILS approach?

A

GLS approaches are not available.

38
Q

Minimum visibility for CAT 1 ILS approach when HIAL is not available?

A

1.5km

39
Q

Minimum visibility for ILS CAT I when high intensity runway edge lighting is not available?

A

1.2km

40
Q

Minimum visibility for ILS CAT I when instrumented RVR information in the threshold zone is not available?

A

0.8km

Instruments & Aids (7 decks)

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