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CPL Test Series
Question Bank
Questions for ILS
Answer the following questions
Test Mode
Training Mode
1. Which of the following correctly describes the Instrument Landing System (ILS) localiser rediation pattern?
Two overlapping lobes on different radio carrier frequency but with the same modulation.
Two overlapping lobes on the same UHF carrier frequency.
Two overlapping lobes on the same VHF carrier frequency.
A pencil beam comprising a series of smaller beams each carrying different modulation.
2. What according to ICAO Annex 10, is the range of a locator?
50 to 100 nm.
100 to 300 nm.
10 to 25 nm.
25 to 50 nm.
3. The ILS marker identified visually by an amber flashing light is the?
Outer marker.
Inner marker.
Locator
Middle marker.
4. Concerning the localiser principle of operation in an ILS, the difference in depth of modulation(DDM): 1. Decreases with respect to the angular displacement from the centreline. 2. Increases with right displacement from the cenreline. 3. Decreases with left displacement from the centreline. 4. Increases linearly with displacement from the centreline. The combination regrouping all of the correct statements is?
2 and 3.
1 and 4.
1 and 3.
2 and 4.
5. A locator beacon differs from an NDB with respect to: 1. Operational use. 2. Transmission power. 3. Presentation in the cockpit. 4. Frequency band. From the above stated differences the following numbers are correct?
1, 2 and 3.
1 and 2.
2, 3 and 4.
1 and 4.
6. The audio modulation of the middle marker is keyed to give?
Alternating dots and dashed at a rate of 2 dashed per second and 6 dots per second.
A sequence of 3 dashes, 3 dots and 3 dashes every second.
Continuous dots at a rate of 6 dots per second.
Continuous dashes at a rate of dashes per second.
7. Which of the following is an ILS Localiser frequency?
110.20 MHz.
112.10 MHz.
109.15 MHz.
108.25 MHz.
8. On what carrier frequency does the inner marker transmit?
75 MHz.
Same frequency as the localiser.
Same frequency as the glide path.
3000 Hz.
9. The ILS marker with an aural frequency of 3000 Hz is the?
Middle marker.
Inner marker (if availale)
Centreline marker.
Outer marker.
10. Inner marker beacon of an ILS transmit at?
150 MHz.
75 MHz.
It depends on the modulating frequency.
90 Hz.
11. All ILS marker beacons transmit at?
90 MHz
150 MHz.
It depends on the modulating frequency.
75 MHz.
12. The heading rose of an HSI is frozen on 200 degrees. Lined up with the ILS of runway 25, the localiser will be?
Centred.
Right of centre.
Left of centre.
Centred with the "Fail" flag showing.
13. Every 10 kt decrease in groundspeed, on a 3° ILS glidepath, will require an approximate
Increase in the aircraft's rate of descent of 50 FT/MIN.
Increase in the aircraft's rate of descent of 100 FT/MIN.
Decrease in the aircraft's rate of descent of 50 FT/MIN.
Decrease in the aircraft's rate of descent of 100 FT/MIN.
14. The ILD marker identified visually by a blue flashing light is the?
Middle marker.
Outer marker.
Inner marker.
Locator.
15. One of the possible disturbances of the ILS signals is "scalloping". Which statement is correct?
Scalloping are minor changes or bends, which can be followed by the aircraft.
Scalloping are minor changes or bends, which cannot 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.
16. On an ILS approach, the localiser needle is fully over to the left. How much deflection does this indicate?
0.7 degrees.
5 degrees.
2.5 degrees.
10 degrees.
17. 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 halfway the scale.
Approximately a three quarters of the scale.
The outer dot.
Approximately a quarter of the scale.
18. The ILS receiver of an aircraft on approach and flying on the right of the exact runway centreline will receive?
A modulated signal and will shift the localiser needle to the right according to the magnitude of the difference between the two amplitudes.
More 150 Hz localiser signal than the 90 Hz localiser signal.
The modulation from both lobes at equal amplitude.
The left lobe modulation only.
19. On an ILS approach, when flying overhead the middle marker the colour of the flashing light will be?
Amber
Green.
White
Blue
20. The OUTER MARKER of an Instrument Landing System (ILS) facility transmits on a frequency of
300 MHz and is modulated by morse at two dashes per second.
75 MHz and is modulated by more at two dashes per secon.
200 MHz and is modulated by alternate dot/dash in morse.
75 MHz and is modulated by alternate dot/dash in morse.
21. In an ILS, concerning the glide path principle of operation, the difference in depth of modulation (DDM) will?
Decrease with displacement above or below the glide path.
Increase from centre position to half full scale of the needle of the indicator and decrease until full scale of the needle.
Increase with above displacement from the glide path, and decrease with displacement below the glide path.
Increase with displacement above or below the glide path.
22. A locator? 1. Is a low powered beacon. 2. Is a high powered beacon. 3. Has range of 10 nm to 25 nm. 4. Has a range of 10 nm to 200 nm
1 and 3.
2 and 3.
2 and 4.
1 and 4.
23. The ILS marker with the higher aural frequency is the?
Outer marker.
Inner marker.
Middle marker.
Locator
24. 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 300 metres behind the threshold. Middle marker 1000 metres from the threshold. Outer marker 4 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 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 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.
25. Fill scale deflection of the localiser needle indicates that the aircraft is approximately?
2.5 degrees offset from the localiser centreline.
5 degrees offset from the localiser centreline.
1.25 degrees offset from the localiser centreline.
10 degrees offset from the localiser centreline.
26. On final on an ILS approach you are flying overhead the outer marker. You can expect to be at?
10 nm from the threshold.
1 nm from the threshold.
4 nm from the threshold.
25 nm from the threshold.
27. ILS is subject to false glide paths resulting from
Ground returns ahead of the antennas.
Back-scattering of anternnas.
Multiple lobes of radiation patterns in the vertical plane.
Spurious signals reflected by nearby obstacles.
28. The amplitude modulation and the colour of an outer marker (OM) is
400 Hz, amber.
3000 Hz, blue.
400 Hz, blue.
1300 Hz, blue.
29. Locators are: 1. High powered NDBs used for en route and airways. 2. Low powered NDBs used for airfield airfield runway approach. 3. Beacons with a usually range of 10 to 250 nm. 4. Beacons with a usually range of 10 to 25 nm. The combination regrouping all of the correct statements is?
2 and 3.
1 and 3.
1 and 4.
2 and 4.
30. The ILS inner marker (if available) modulation frequency is?
240 Hz.
400 Hz.
1300 Hz.
3000 Hz.
31. The basic principle of operation of the ILS is the difference in depth of modulation (DDM) between the two lobes. 1.If the aircraft strays right, the higher tone lobe will be received at a higher intensity than the lower tone lobe. 2. A DDM of zero indicates the exact runway centreline. 3. The depth of modulation increases away from the centreline. 4. A DDM of zero indicates a balance between modulations. The combination that regroups all of the correct statements is?
2, 3 and 4.
1, 2, 3 and 4.
1 and 3.
2 and 3.
32. What is measured in order to establish aircraft position in relation to the localiser beam on an ILS?
The difference in phase between the 90 Hz and the 15 Hz modulations.
The bearing to the localiser antenna found by means of a loop aerial.
The difference in depth between the 90 Hz and the 15 Hz modulations.
The difference in time between the 90 Hz and the 15 Hz modulations.
33. The back CRS of an ILS may give?
Precision approach guidance for the main approach runway.
Precision approach guidance for the reciprocal of the main approach runway.
Non-precision approach guidance for the main approach runway.
Non-precision approach guidance for the reciprocal of the main approach runway.
34. An aircraft carrying out a 3° glide ILS approach experiences a reduction i groudspeed from 150 kt at the outer marker to 120 kt over the threshold. The effect of this change in groundspeed on the aircraft's rate of descent will be a decrease of approximately
250 FT/MIN.
100 FT/MIN.
150 FT/MIN.
50 FT/MIN
35. 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 difference in depth between the 90 Hz and the 150 Hz modulations.
The bearing of the localiser antenna found by means of a loop antenna.
36. The rate of descent required to maintain a 3.25° glide slope at a groundspeed of 140 kt is approximately
670 FT/MIN.
700 FT/MIN.
850 FT/MIN.
800 FT/MIN.
37. Outer marker beacon of an ILS transmit at?
It depends on the modulating frequency.
75 MHz.
90 Hz.
150 MHz.
38. ILS transmitters use the?
VHF band only.
UHF and VHF bands.
UHF band only.
VHF, UHF, and HF bands.
39. Which of the following alternatives is correct regarding audio and visual signals in the cockpit when passing overhead the middle market?
Audio: 1300 Hz alternating dots and dashes. Visual: Amber light flashes.
Audio: 74 MHz 2 dots per second. Visual: Blue light flashed.
Audio: 400 Hz, 2 dashes per second, Visual: Blue light flashes.
Audio: 3000 Hz alternating dots and dashes. Visual: Amber light flashes.
40. 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 then during good weather operations is
To increase distance from the runway during offset approach operations.
Aircraft manoeuring near the runway may disturb guidance signals.
Heavy precipitation may disturb guidance signals.
To increases aircraft aeparation in very reduced visibility conditions.
41. An ILS receiver?
Measures the phase rotation of the transmitted signals.
Measures the difference in depth of modulation of the transmitted signals.
Measures the phase difference of the transmitted signals.
Measures the difference in frequency of modulation of the transmitted signals.
42. What is the approximate angular coverage of reliable navigation information for a 3 degree glide path out to a minimum distance of 10 nm?
0.45 degrees above the horizontal to 1.75 degrees above the glide path, and 8 degrees each side of the localiser centreline.
3 degrees above the horizontal to 5.25 degrees above the horizontal, and 8 degrees each side of the localiser centreline.
0.70 degrees above the glide path and 2.5 degrees each side of the localiser centreline.
1.35 degrees above the horizontal to 5.25 degrees above the horizontal, and 8 degrees each side of the localiser centreline.
43. Which of the following is an ILS localiser frequency?
109.15 MHz.
110.20 MHz.
112.10 MHz.
108.25 MHz.
44. What is the approximate angular coverage of reliable navigation information for a 3° ILS glide path out to a distance of 10 NM?
0.45° above the horizontal to 1.75° above the glide path and 8° each side of the localiser centreline.
0.7° above and below the glide path and 2.5° each side of the localiser centreline
1.35° above the horizontal to 5.25° above the horizontal and 8° each side of the localiser centreline.
3° above and below the glide path and 10° each side of the localiser centreline
45. Instrument Landing System (ILS) Glide Paths provide azimuth coverage (i) __________° each side of the localiser centre-line to a distance of (ii) _________ NM from thethreshold
(i) 25 (ii) 17.
(i) 5 (ii) 8.
(i) 8 (ii) 10.
(i) 35 (ii) 25.
46. 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?
Maximum.
Less than 90 Hz.
Null.
More than 150 Hz.
47. The ILS marker identified by a series of dots (6/sec) is the?
Outer marker.
Inner marker.
Middle marker.
Locator.
48. On an ILS approach, when flying overhead the middle marker the colour of the flashing light will be?
Blue.
Green.
White.
Amber.
49. The ILS receiver of an aircraft on approach and flying on the glide path will receive?
The same modulation frequency signal from both lobes with the maximum of magnitute.
The modulation from both lobes at equal depth.
The maximum magnitude of the difference between the two amplitdes.
No modulated signal because the left and right lobes cancel each other along the centreline.
50. 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 down.
Fly right and fly up.
Fly left and fly up.
Fly left and fly down.
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