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CPL Test Series
Question Bank
Questions for ILS
Answer the following questions
Test Mode
Training Mode
1. The ILS marker identified visually by a white flashing light is the?
Outer marker.
Middle marker.
Inner marker.
Locator
2. ILS is subject to false glide paths resulting from
Back-scattering of anternnas.
Ground returns ahead of the antennas.
Multiple lobes of radiation patterns in the vertical plane.
Spurious signals reflected by nearby obstacles.
3. The UHF band is assigned to the. 1.Locator. 2. Localiser. 3. Outer Marker. 4. Glide Path. The combination regrouping all of the correct statements is?
1.
4.
1 and 3.
3 and 4.
4. Where, in relation to the runway, is the ILS localiser transmitting aerial normally situated?
At the approach end of the runway about 300 m fro touchdown on the Centrelies.
On the non-approach end of the runway about 300 m from the runway on the extended centreline.
At the approach end about 150 m to out side the runway and 300 m from touchdown.
At the non-approach end about 150 m to one side of the runway and 300 m along the extended centreline.
5. The three different markers can be used in the ILS to determine the distance to the ILS touchdown point of the runway as follows?
The inner marker warms the pilot of the last chance to commence the missed approach procedure.
The outer marker indicates the position where normally the descent has to commence.
The middle marker indicates the position for the decision for a missed approach during a CATI approach due to bad visibility.
The markers are only important in the situation when glide path transmission has ceased.
6. What is measured in order to establish aircraft position in relation to the localiser beam on an ILS?
The difference in time between the 90 Hz and the 150 Hz modulations.
The difference in phase between the 90 Hz and the 150 Hz modulations.
The bearing of the localiser antenna found by means of a loop antenna.
The difference in depth between the 90 Hz and the 150 Hz modulations.
7. On an ILS approach, when flying overhead the outer marker the colour of the flashing light will be?
White.
Green.
Blue.
Amber
8. The rate of descent required to maintain a 3.25 degree glide slope at a ground speed of 140 kts is approximately?
700 ft/min.
850 ft/min.
760 ft/min.
670 ft/ min.
9. ILS produces?
A radiation pattern which is amplitude modulated by a 90 Hz and a 15 Hz signal.
A 90 Hz lobe and a 150 Hz lobe which are amplitude modulated by the VHF frequency of the ILS.
A radiation pattern which is amplitude modulated by the VHF frequency of the ILS.
Two lobes modulated in frequency by 90 Hz and 150 Hz signals.
10. The amplitude modulation and the colour of an outer marker (OM) is
400 Hz, amber.
3000 Hz, blue.
400 Hz, blue.
1300 Hz, blue.
11. According to the ILS coverage areas as defined in ICAO Annex 10, in which of the following situations will the pilot be guaranteed a reliable signal from the localiser?
10 nm from touchdown inbound and 38 degrees displaced from the localiser centreline.
19 nm from touchdown inbound and 13 degrees displaced from the localiser centreline.
27 nm from touchdown inbound and 8 degrees displaced from the localiser centreline.
20 nm from touchdown inbound and 8 degrees displaced from the localiser centreline.
12. According to ICAO Annex 10, in which frequency band(s) does the locator normally transmit?
HF
MF/HF.
LF/MF.
HF/VHF.
13. The rate of descent required to maintain a 3.25° glide slope at a groundspeed of 140 kt is approximately
800 FT/MIN.
850 FT/MIN.
670 FT/MIN.
700 FT/MIN.
14. Outer marker beacon of an ILS transmit at?
150 MHz.
75 MHz.
90 Hz.
It depends on the modulating frequency.
15. The ILS marker with the lower aural frequency is the?
Inner marker.
Outer marker.
Centreline marker.
Middle marker.
16. On what carrier frequency does the inner marker transmit?
Same frequency as the glide path.
75 MHz.
Same frequency as the localiser.
3000 Hz.
17. In an ILS, concerning the localiser principle of operation, the difference in depth of modulation (DDM) will?
Increase from centre position to half full scale of the needle of the indicator and decrease until full scale of the needle.
Increase with displacement from the centreline.
Increase with left displacement from the centreline, and decrease with right displacement from the centreline.
Decrease with displacement from the centreline.
18. The type of modulation used for the ILS frequency carrier is?
Amplitude modulation.
Dual modulation.
Phase modulation.
Frequency modulation.
19. Which of the following alternatives is correct regarding audio and visual signals in the cockpit when passing overhead the middle market?
Audio: 3000 Hz alternating dots and dashes. Visual: Amber light flashes.
Audio: 400 Hz, 2 dashes per second, Visual: Blue light flashes.
Audio: 1300 Hz alternating dots and dashes. Visual: Amber light flashes.
Audio: 74 MHz 2 dots per second. Visual: Blue light flashed.
20. Which facility associated with the ILS may be identified by a two-letter identification group?
Glide Path.
Outer Marker.
Locator
Inner Marker.
21. The heading rose of an HSI is frozen on 200°. Lined up on the ILS of runway 25, the localizer needle will be?
Centred.
Right of centre.
Centred with the 'fail' flag showing.
Left of centre.
22. A VOR is situated at the far end of the runway on which an aircraft is making an ILS approach. Nav 1 is switched to the localiser frequency and Nav 2 to the VOR frequency. At the moment that the needle of #1 indicator reaches the outer dot the deflection needle of #2 indicator will be at?
Approximately a quarter of the scale.
Approximately a halfway the scale.
The outer dot.
Approximately a three quarters of the scale.
23. The ILS middle marker modulation frequency is?
800 Hz.
3000 Hz.
400 Hz.
1300 Hz.
24. The audio modulation of the middle marker is keyed to give?
A sequence of 3 dashes, 3 dots and 3 dashes every second.
Alternating dots and dashed at a rate of 2 dashed per second and 6 dots per second.
Continuous dashes at a rate of dashes per second.
Continuous dots at a rate of 6 dots per second.
25. On final on an ILS approach you are flying overhead the outer marker. You can expect to be at?
1 nm from the threshold.
4 nm from the threshold.
10 nm from the threshold.
25 nm from the threshold.
26. In an ILS system, concerning the glide path principle of operation, the difference in depth of modulation (DDM). 1. Decreases with angular displacement below the glide path. 2. Increases with angular displacement above the glide path. 3. Decrease with angular displacement above the glide path. 4. Increases with angular displacement below the glide path
1 and 4.
2 and 4.
2 and 3.
1 and 3.
27. Which of the following is an ILS localiser frequency?
109.15 MHz.
110.20 MHz.
108.25 MHz.
112.10 MHz.
28. The audio frequency modulation of the inner marker shall be keyed as follows?
2 dashes per second continuously.
3 dashes, 3 dots, and 3 dashes per second continuously.
A continuous series of alternate dots and dashes.
6 dots per second. Continuously.
29. What is the effect of FM broadcast stations that transmit on frequencies just below 108 MHz on the performance of ILS?
These transmissions may activate the FM immune filter which results in the appearance of the localiser and glide path failure flag.
These transmissions may interfere with the ILS localiser and glide path signal which may lead to erroneous deviation indications.
These transmissions may interfere with the ILS localiser signal which may lead to erroneous deviation indications.
These transmissions may activate the FM immune filter which results in the appearance of the failure flag.
30. The audio frequency modulation of the middle marker shall be keyed as follows?
6 dots per second continuously.
3 dashes, 3 dots, and 3 dashes per second continuously.
2 dashes per second continuously.
A continuous series of alternate dots and dashes, the dashes keyed at a rate of 2 dashes per second, and the dots keyed at a rate of 6 dots per second.
31. The ILS marker with an aural frequency of 400 Hz is?
Locator.
Inner marker.
Middle marker.
Outer marker.
32. An aircraft is flying a 3 degree glide path and experiences a reduction in groundspeed from 150 kts at the outer marker to 120 kts over the threshold. The effect of this change in groundspeed on the aircraft's rate of decent will be decrease of approximately?
250 ft/min.
100 ft/min.
150 ft/min.
50 ft/min.
33. Performing an ILS approach, you will fly overhead the markers in a specific order. The order is?
OM, MM, IM (if available).
OM, IM (if available), MM.
IM (if available), MM, OM.
MM, IM, (if available) , OM.
34. According to ICAO 8168, what is regarded as the maximum safe deviation below the glide path during ILS approaches?
Three quarters scale deflection.
Full scale deflection.
Half scale deflection.
One quarter scale deflection.
35. The OUTER MARKER of an Instrument Landing System (ILS) facility transmits on a frequency of
75 MHz and is modulated by more at two dashes per secon.
200 MHz and is modulated by alternate dot/dash in morse.
300 MHz and is modulated by morse at two dashes per second.
75 MHz and is modulated by alternate dot/dash in morse.
36. A Category 1 Instrument Landing System (ILS) ground installation provides accurate guidance from coverage limit down to
200 feet above the runway threshold.
50 feet above ILS reference point.
Runway surface.
200 feet above the inner marker.
37. Which answer states the typical distances along the centreline of the runway of the various ILS components?
Localiser transmitter 100 metres behind end of runway. Glide Path transmitter 100 metres behind the threshold. Middle marker 1.5 nm from the threshold. Outer marker 10 nm from the threshold.
Localiser transmitter 300 metres behind end of runway. Glide Path transmitter 300 metres behind the threshold. Middle marker 1.5 nm from the threshold. Outer marker 10 nm from the threshold.
Localiser transmitter 300 metres behind end of runway. Glide Path transmitter 300 metres behind the threshold. Middle marker 1000 metres from the threshold. Outer marker 4 nm from the threshold.
Localiser transmitter 100 metres behind end of runway. Glide Path transmitter 300 metres behind the threshold. Middle marker 1000 metres from the threshold. Outer marker 4 nm from the threshold.
38. All ILS marker beacons transmit at?
75 MHz.
150 MHz.
It depends on the modulating frequency.
90 MHz
39. What are the modulation frequencies of the two overlapping lobes that are used on an ILS approach?
63 MHz 123 MHz.
328 MHz 335 MHz
90 Hz 150 Hz.
75 kHz 135 kHz.
40. In which frequency band does an ILS glide slope transmit?
VHF.
EHF.
SHF
UHF.
41. The basic principle of operation of the ILS is the difference in depth of modulation (DDM) between the 90 Hz and the 150 Hz lobes. A DDM of zero indicates: 1. The higher tone lobe is received at a higher strength than the lower the lobe. 2. The exact runway centreline. 3. Aircraft is on the glide path. 4. A balance between modulations
2, 3 and 4.
1 and 3.
2 and 3.
1, 2 and 4.
42. Concerning the glide path principle of operating in an ILS, the needle of the aircraft indicator is centred when the difference in depth of modulation (DDM) is?
Null.
Less than 90 Hz.
Maximum.
More than 150 Hz.
43. Assuming a five display, what does each of the dots on either side of the ILS localizer cockpit display represent
0.5 degrees.
2.5 degrees.
2.0 degrees.
1.5 degrees.
44. One of the possible disturbances of the ILS signals is "scalloping". Which statement is correct?
Scalloping are minor changes or bends, which cannot be followed by the aircraft.
Scalloping are minor changes or bends, which can be followed by the aircraft.
Scalloping causes rapid indicator changes from side to side of the intended approach path, which cannot be followed by the aircraft.
Scalloping are rapid changes or bends, which can be followed by the aircraft.
45. Which of these markers has the highest audible frequency?
Airways
Outer.
Middle.
Inner.
46. Which of the following list use the VHF band? 1. Locator. 2. Localiser. 3. Outer Marker. 4. Glide path. The combination that regroups all the correct statements is?
1, 2, 3 and 4.
1 and 3.
2 and 4.
2 and 3.
47. The ILS receive of an aircraft flying down the exact runway centreline will receive?
The maximum magnitude of the difference between the 90 Hz and the 150 Hz amplitudes.
No modulated signal because the left right lobes cancel each other along the centreline.
The same frequency modulated signal from both lobes with the maximum of magnitude.
90 Hz and 150 Hz lobes at equal depth.
48. The ILS marker identified visually by an amber flashing light is the?
Middle marker.
Inner marker.
Outer marker.
Locator
49. An aircraft carrying out an ILS approach is receiving more 90 Hz than 150 Hz modulation notes from both the localish and glide transmitters. The ILS indication will show
Fly right and fly up.
Fly right and fly down.
Fly left and fly up.
Fly left and fly down.
50. Which of the following correctly describes the Instrument Landing System (ILS) localiser rediation pattern?
Two overlapping lobes on the same UHF carrier frequency.
Two overlapping lobes on the same VHF carrier frequency.
Two overlapping lobes on different radio carrier frequency but with the same modulation.
A pencil beam comprising a series of smaller beams each carrying different modulation.
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