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RADIO NAV-RH-THEORY-MODULE5-ILS
1.
The OUTER MARKER of an Instrument Landing System (ILS) facility transmits on a frequency of:
a) 300 MHz and is modulated by Morse at two dashes per second
b) 200 MHz and is modulated by alternate dot/dash in Morse
c) 75 MHz and is modulated by alternate dot/dash in Morse
d) 75 MHz and is modulated by Morse at two dashes per second
2.
An aircraft carrying out an ILS approach is receiving more 90 Hz than 150 Hz modulation notes from both the localiser and glide path transmitters. The ILS indication will show:
a) Fly right and fly down
b) Fly left and fly down
c) Fly right and fly up
d) Fly left and fly up
3.
The visual and aural indications of the ILS outer marker are:
a) A blue light and 2 dashes per second of a 1300 Hz modulated tone
b) An amber light and alternate dots and dashes of a 1300 Hz modulated tone
c) A white light and 6 dots per second of a 30 Hz modulated tone
d) A blue light and 2 dashes per second of 400 Hz modulated tone
4.
The MIDDLE MARKER of an Instrument Landing System (ILS) facility is identified audibly and visually by a series of:
a) alternate dots and dashes and an amber light flashing
b) two dashes per second and a blue light flashing
c) dots and a white light flashing
d) dashes and an amber light flashing
5.
The heading rose of an HSI is frozen on 200o. Lined up on the ILS of runway 25, the localiser needle will be:
a) right of centre
b) left of centre
c) centred
d) centred with the fail flag showing
6.
The sensitive area of an ILS is the area aircraft may not enter when:
a) ILS operations are in progress
b) category 1 ILS operations are in progress
c) category II/III ILS operations are in progress
d) the ILS is undergoing calibration
7.
ILS is subject to false glide paths resulting from:
a) back-scattering of antennas
b) spurious signals reflected by nearby obstacles
c) multiple lobes of radiation patterns in the vertical plane
d) ground returns ahead of the antennas
8.
For a category one ILS glide path of 3.3 degrees the coverage is:
a) 1.49 to 5.77 degrees
b) 1.49 to 5.94 degrees
c) 1.65 to 5.77 degrees
d) 1.65 to 5.94 degrees
9.
What is the colour sequence when passing over an Outer, Middle and Inner Marker beacon?
a) white – amber – blue
b) amber – white – green
c) blue – amber – white
d) blue – green – white
10.
The coverage of the ILS glide slope with respect to the localiser centreline is:
a) +/- 10 deg to 8 nm
b) +/- 10 deg to 25 nm
c) +/- 8 deg to 10 nm
d) +/- 35 deg to 17 nm
11.
The reason why pre take-off holding areas are sometimes further from the active runway when ILS Category 2 and 3 landing procedures are in progress than during good weather operations is:
a) heavy precipitation may disturb guidance signals
b) aircraft manoeuvring near the runway may disturb guidance signals
c) to increase distance from the runway during offset approach operations
d) to increase aircraft separation in very reduced visibility conditions
12.
The coverage of the ILS localiser at 17 nm is guaranteed up to an angle either side of the extended centreline of:
a) 30 degrees
b) 25 degrees
c) 35 degrees
d) 10 degrees
13.
Assuming a five dot display, what does each of the dots on either side of the ILS localiser cockpit display represent:
a) 2.0 degrees
b) 1.5 degrees
c) 2.5 degrees
d) 0.5 degrees
14.
Instrument Landing Systems (ILS) Glide Paths provide azimuth coverage (i) each side of the localiser centreline to a distance of (ii) NM from the threshold.
a) (i) 8o (ii) 10
b) (i) 25o (ii) 17
c) (i) 35o (ii) 25
d) (i) 5o (ii) 8
15.
In which frequency band does an ILS glide slope transmit?
a) VHF
b) UHF
c) SHF
d) EHF
16.
On an ILS approach you receive more of the 90 Hz modulation than the 150 Hz modulation. The action you should take is:
a) fly left and up
b) fly left and down
c) fly right and up
d) fly right and down
17.
A HSI compass rose is stuck on 200 deg. When the aircraft is lined up on the centreline of the ILS localiser for runway 25, the localiser needle will be:
a) left of the centre
b) centred
c) right of the centre
d) centred with the fail flag showing
18.
An aircraft on an ILS approach is receiving more 90 Hz modulation than 150Hz modulation in both localiser and glide path. The correct action to regain the centreline and glide path would be to:
a) increase rate of descent and fly left
b) reduce rate of descent and fly right
c) increase rate of descent and fly right
d) reduce rate of descent and fly left
19.
What is the approximate angular coverage of reliable navigation information for a 3o ILS glide path out to a distance of 10 NM?
a) 0.45o above the horizontal to 1.75o above the glide path and 8o each side of the localiser centreline
b) 1.35o above the horizontal to 5.25o above the horizontal and 8o each side of the localiser centreline
c) 0.7o above and below the glide path and 2.5o each side of the localiser centreline
d) 3o above and below the glide path and 10o each side of the localiser centreline
20.
Where, in relation to the runway, is the ILS localiser transmitting aerial situated?
a) On the non-approach end of the runway about 300m from the runway on the extended centreline
b) At the approach end of the runway about 300m from touchdown on the centreline
c) At the non-approach end about 150 m to one side of the runway and 300m along the extended centreline
d) At the approach end about 150m to one side of the runway and 300m from touchdown
21.
An aircraft tracking to intercept the Instrument Landing System (ILS) localiser inbound on the approach side, outside the published ILS coverage angle:
a) will receive signals without identification coding
b) will not normally receive signals
c) may receive false course indications
d) can expect signals to give correct indications
22.
Outer marker transmits on 75 MHz and has an aural frequency of:
a) 1300 Hz
b) 400 Hz
c) 2000 Hz
d) 3000 Hz
23.
At 5.25 nm from the threshold an aircraft on an ILS approach has a display showing it to be 4 dots low on a 3 degree glide path. Using an angle of 0.15o per dot of glide slope deviation and the 1 in 60 rule calculate the height of the aircraft from touchdown.
a) 1280 ft
b) 1325 ft
c) 1375 ft
d) 1450 ft
24.
The amplitude modulation and the colour of an outer marker (OM) is:
a) 400 Hz, blue
b) 3000 Hz, blue
c) 1300 Hz, blue
d) 400 Hz, amber
25.
Which of the following is an ILS localiser frequency?
a) 112.10 MHz
b) 108.25 MHz
c) 110.20 MHz
d) 109.15 MHz
26.
The principle of operation of an ILS localiser transmitter is based on two overlapping lobes that are transmitted on (i) frequencies and carry different (ii).
a) (i) the same; (ii) modulation frequencies
b) (i) the same; (ii) phases
c) (i) different; (ii) modulation frequencies
d) (i) different; (ii) phases
27.
A Cat III ILS glide path transmitter provides reliable guidance information down to:
a) the surface of the runway
b) a maximum height of 200 ft above the runway
c) a maximum height of 100 ft above the runway
d) a maximum height of 50 ft above the runway
28.
What frequency is assigned to all ILS marker beacons?
a) One chosen from between 108-112 MHz at odd tenths
b) 75 MHz
c) 90 Hz
d) 150 Hz
29.
Which of the following statements is true, in respect of an ILS?
a) If the glide path is not operating, the ILS will be switched off
b) An ILS cannot be used if either of the outer or middle markers is switched off
c) The glide path frequency is paired with the marker frequency
d) The glide path transmits on UHF
30.
Which of the following statements is TRUE?
a) A localiser back beam should only be used for approaches if there is a published procedure
b) All localisers have back beams. They provide guidance in the event of a missed approach
c) Localiser back beams are never checked for accuracy
d) A localiser back beam will always provide reversed steering signals
31.
An ILS category II ground installation is one that is capable of providing guidance to a height of:
a) 15m above the horizontal plane containing the threshold
b) 60m above the horizontal plane containing the threshold
c) 15m on QNH
d) 60m on QNH
32.
A localiser must provide horizontal coverage to a distance of:
a) 17 nm all around
b) 10 nm all around
c) 17 nm over a sector of 35o each side of centre line
d) 25 nm over a sector of 15o each side of centre line
33.
On a localiser the modulations are at 150 Hz and 90 Hz. Which of the following statements is correct?
a) The 90 Hz modulation predominates to the right of the centre line
b) The 150 Hz modulation predominates to the right of the centre line
c) If the 150 Hz modulations predominates, the needle on the CDI moves to the right of centre
d) When both modulations are received, the aeroplane will be on the centre line
34.
The upper limit of the vertical coverage of the localiser must be:
a) not less than 300 m above the highest point on the approach
b) not less than 7o above the horizontal (drawn from the localiser)
c) not less than 600 m above the horizontal
d) not less than 35o above the horizontal
35.
The glide path signals must be received to a range of 10 nm over a sector:
a) 10o each side of the localiser centre line
b) 10o wide centred on the localiser centre line
c) 8o each side of the localiser centre line
d) 8o wide centred on the localiser centre line
36.
Which of the following is TRUE in respect of using ILS?
a) When using a CDI you must set the OBS to the localiser course
b) When using a CDI in the overshoot sector you must disobey the needles
c) When using an HSI you must set the course arrow to the localiser course
d) When using an HSI the glide path must be set before approach
37.
A Category 1 Instrument Landing System (ILS) ground installation provides accurate guidance from coverage limit down to:
a) runway surface
b) 200 feet above the inner marker
c) 200 feet above the runway threshold
d) 50 feet above ILS reference point
38.
According to ICAO 8168, what is regarded as the maximum safe deviation below the glide path during ILS approach?
a) Half scale deflection
b) One quarter scale deflection
c) Three quarter scale deflection
d) Full scale deflection
39.
Assuming a five dot display on either side of the CDI on the ILS localiser cockpit display, what does each of the dots represent approximately?
a) 2.5 degrees
b) 1.5 degrees
c) 0.5 degrees
d) 2.0 degrees
40.
Assuming a five dot display on either side of the ILS localiser cockpit display, what is the angular displacement of the aircraft from the localiser centre line when the CDI is deflected 2 dots to the right?
a) 1.0o to the right
b) 2.0o to the left
c) 2.0o to the right
d) 1.0o to the left
41.
Full deflection on a glide slope indicator indicates that the aircraft is:
a) 2.5o above or below the correct glide path
b) 0.7o above or below the correct glide path
c) 0.5o above or below the correct glide path
d) 1.25o above or below the correct glide path
42.
Full scale deflection of the localiser needle indicates that the aircraft is approximately:
a) 10o offset from the localiser centre line
b) 5o offset from the localiser centre line
c) 1.25o offset from the localiser centre line
d) 2.5o offset from the localiser centre line
43.
On what carrier frequency does the inner marker transmit?
a) Same frequency as the localiser
b) 75 MHz
c) Same frequency as the glide path
d) 3000 Hz
44.
What are the modulation frequencies of the two overlapping lobes that are used on an ILS approach?
a) 75 kHZ 135 kHZ
b) 90 HZ 150 HZ
c) 328 mHZ 335 mHZ
d) 63 mHZ 123 mHZ
45.
What is measured in order to establish aircraft position in relation to the localiser beam on an ILS?
a) The difference in phase between the 90 Hz modulation and the 150 Hz modulation
b) The difference in depth between the 90 Hz modulation and the 150 Hz modulation
c) The bearing to the localiser antenna found by means of a loop antenna
d) The difference in time between the 90 Hz modulation and the 150 Hz modulation
46.
What is the audio frequency of the inner marker?
a) 400 Hz
b) 1300 Hz
c) 3000 Hz
d) 75 MHz
47.
Which of the following alternatives is correct regarding audio and visual signals in cockpit when passing overhead a middle marker?
a) Audio: 400 Hz, 2 dashes per second. Visual: Blue light flashes
b) Audio: 1300 Hz, alternating dots and dashes. Visual: Amber light flashes
c) Audio: 75 MHz, 2 dashes per second. Visual: Blue light flashes
d) Audio: 3000 Hz, alternating dots and dashes. Visual: Amber light flashes
48.
Which of the following correctly describes the Instrument Landing System (ILS) localiser radiation pattern?
a) Two overlapping lobes on the same UHF carrier frequency
b) Two overlapping lobes on the same VHF carrier frequency
c) pencil beam comprising a series of smaller beams each carrying a different modulation
d) Two overlapping lobes on different radio carrier frequencies but with the same modulation
49.
Which of the following is correct regarding false beams on a glide path?
a) False beams will only be found more than 10 degrees
b) False beams will only be found above the correct glide path
c) False beams are only present when flying a back beam ILS approach
d) False beams will only be found below the correct glide path
50.
Which range facility associated with the ILS may be identified by a two-letter identification group?
a) Locator
b) Inner marker
c) Outer marker
d) Glide path
51.
Which of the following elements of an ILS transmit in the VHF band?
a) Localiser only
b) Market beacons only
c) Glide path and marker beacons
d) Localiser and marker beacons
52.
Which of the following is true with respect to marker beacons?
a) An airway marker and an ILS inner marker carry the same modulation
b) Airway markers and ILS middle markers have the same modulations
c) Airway markers and ILS outer markers have the same modulations
d) No two markers have the same modulations
53.
ILS marker beacons do not interfere with each other because:
a) They operate on different modulations
b) They operate at different frequencies
c) They transmit in narrow vertical beams
d) They transmit low power signals, which cannot be detected by the aeroplane’s receiver
54.
ILS markers are identified in the aeroplane by colour light and audio signal. The identification of the outer marker is:
a) High-pitched dashes; amber light
b) Low-pitched dots and dashes; amber light
c) High-pitched dots and dashes; blue light
d) Low-pitched dashes; blue light
55.
The azimuth and area coverage of a Cat I ILS localiser is:
a) 8o at 10 nm, 25o at 25 nm
b) 35o at 17 nm, 10o at 25 nm
c) 8o at 35 nm, 25o at 10 nm
d) 8o at 10 nm, 10o at 25 nm
56.
ILS back beams may be received:
a) When flying outside the area of coverage
b) Never
c) When approaching the ILS from behind the glide path aerial
d) When approaching the ILS from behind the localiser aerial
57.
An ILS localiser can give reverse sense indications on the approach side and outside the protected coverage:
a) Beyond 25 nm
b) Beyond 35o azimuth either side of the approach
c) Beyond 10o azimuth either side of the approach
d) At anytime
58.
The emission characteristics of the ILS and a typical localiser frequency are:
a) A9W 329.30 MHz
b) A8W 110.30 MHz
c) A9W 110.70 MHz
d) A8W 113.30 MHz
59.
The ILS glide path coverage in elevation is accurate to:
a) An angle 1.35o to an angle of 5.25o above the horizontal for a 3o glide path
b) An angle 1.35o to an angle of 5.25o above the horizontal for a 3.25o glide path
c) An angle 0.45o to an angle of 1.75o above the horizontal for a 3o glide path
d) An angle 0.45o to an angle of 1.75o above the horizontal for a 3.25o glide path
60.
The sequence of marker colours when flying an ILS approach are:
a) white, blue, amber
b) blue, white, amber
c) blue, amber, white
d) amber, blue, white
61.
The ILS localiser is normally positioned:
a) 300 m from the downwind end of the runway
b) 300 m from the threshold
c) 300 m from the upwind end of the runway
d) 200 m abeam the threshold
62.
An aircraft is flying downwind outside the coverage of the ILS. The CDI indications will be:
a) unreliable in azimuth and elevation
b) reliable in azimuth, unreliable in elevation
c) no indications will be shown
d) reliable in azimuth and elevation
63.
The frequency band of the ILS glide path is:
a) UHF
b) VHF
c) SHF
d) VLF
64.
In which band does the ILS glide path operate:
a) Metric
b) Centimetric
c) Decimetric
d) Hectometric
65.
The minima for a AT 1 ILS are:
a) Height: 100 ft ; RVR: 550 m
b) Height: 100 ft ; RVR: 700 m
c) Height: 200 ft ; RVR: 550 m
d) Height: 200 ft ; RVR: 700 m
66.
The minima for a CAT II ILS are:
a) Height: 100 ft ; RVR: 300 m
b) Height: 100 ft ; RVR: 400 m
c) Height: 50 ft ; RVR: 300 m
d) Height: 50 ft ; RVR: 400 m
67.
ILS glide path transmits lobes which are:
a) On the same frequency and are separated by phase comparison
b) On different frequencies which are then phase compared
c) On different frequencies and have different modulations
d) On the same frequency and have different modulations
68.
The middle marker of an ILS has an aural and visual identification of:
a) Alternating dots and dashes (3 per second) with an amber light
b) Alternating dots and dashes (3 per second) with a blue light
c) Continuous dashes (3 per second) with an amber light
d) Continuous dashes (3 per second) with a blue light
69.
The errors of an ILS localiser beam are due to:
a) Emission side lobes
b) Ground reflections
c) Spurious signals from objects near the runway
d) Interference from other systems operating on the same frequency
70.
The coverage of the ILS localiser at 17 nm for a CAT 1 ILS is guaranteed up to an angle either side of the extended centreline of
(i) using the signal outside the coverage limits on the approach side of the localiser aerial
(ii) result in reverse sense indications.
a) (i) 35o ; (ii) can
b) (i) 25o ; (ii) cannot
c) (i) 35o ; (ii) cannot
d) (i) 25o ; (ii) can
71.
The maximum safe ‘fly-up’ indication on the glide path needle (assuming a 5-dot indicator) is:
a) 2 dots
b) 1.5 dots
c) 2.5 dots
d) 1 dot
72.
The ILS localiser transmits VHF frequencies between:
a) 108 and 117,95 MHz
b) 112 and 117,95 MHz
c) 108 and 111,95 MHz
d) 118 and 136,95 MHz
73.
The ILS localiser signal provides azimuth guidance. The signal is made up of two lobes:
a) on the same frequency with the same modulation
b) on different frequencies with the same modulation
c) on different frequencies with different modulations
d) on the same frequency with different modulations
74.
The amplitude modulation of the ILS outer marker is and it illuminates the light in the cockpit:
a) 400 Hz; blue
b) 1300 Hz; amber
c) 400 Hz; amber
d) 1300 Hz; blue
75.
The principle of operation of the ILS localiser transmitter is that it transmits two overlapping lobes on:
a) different frequencies with different phases
b) the same frequency with different phases
c) the same frequency with different amplitude modulations
d) different frequencies with different amplitude modulations
76.
The middle marker is usually located at a range of ___, with an audio frequency of ___ and illuminates the ___ light:
a) 4-6 nm, 1300 Hz, white
b) 1 km, 400 Hz, white
c) 1 km, 1300 Hz, amber
d) 1 km, 400 Hz, amber
77.
The audio frequency of the outer marker is:
a) 3000 Hz
b) 400 Hz
c) 1300 Hz
d) 1000 Hz
78.
In which band does the ILS glide path operate?
a) metric
b) centmetric
c) decimetric
d) hectometric
79.
For a 2.7o glide path on a Category I ILS the vertical coverage is:
a) 1.22o – 4.73o
b) 2.05o – 5.55o
c) 1.85o – 4.75o
d) 1.35o – 5.25o
80.
For reliable navigation information the approximate coverage of a 3o ILS glide slope is:
a) 0.7o above and below the glide path and 8o either side of the localiser centre line
b) 0.45o from the horizontal to 1.75o above the glide path and 8o either side of the localiser centre line
c) 1.5o to 5o from the horizontal and 8o either side of the localiser
d) 3o above and below the glide path and 10o either side of the localiser centre line
81.
Accurate glide path signals cannot be guaranteed above a certain angle relative to the horizontal. That angle is:
a) 0.45 x the glide path angle
b) 5.25 x the glide path angle
c) 1.75 x the glide path angle
d) 1.35 x the glide path angle
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