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CPL Test Series
Question Bank
Questions for ILS
Answer the following questions
Test Mode
Training Mode
1. On what carrier frequency does the inner marker transmit?
75 MHz.
Same frequency as the glide path.
3000 Hz.
Same frequency as the localiser.
2. Middle marker beacon of an ILS transmit at?
It depends on the modulating frequency.
75 MHz.`
90 Hz.
150 MHz.
3. According to ICAO 8168, what is regarded as the maximum safe deviation below the glide path during ILS approaches?
Full scale deflection.
Half scale deflection.
Three quarters scale deflection.
One quarter scale deflection.
4. The localiser transmitters operate in a frequency band between?
329015 MHz and 335 MHz.
111. 975 MHz and 117.975 MHz.
108 MHz and 117.975 MHz.
108 MHz and 111.985 MHz
5. Where, in relation to the runway, is the ILS localiser transmitting aerial normally situated?
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.
At the approach end of the runway about 300 m fro touchdown on the Centrelies.
6. In which frequency band does an ILS glide slope transmit?
EHF.
UHF.
VHF.
SHF
7. Inner marker beacon of an ILS transmit at?
150 MHz.
It depends on the modulating frequency.
90 Hz.
75 MHz.
8. The type of modulation used for the ILS frequency carrier is?
Dual modulation.
Phase modulation.
Amplitude modulation.
Frequency modulation.
9. The ILS marker with the lower aural frequency is the?
Inner marker.
Centreline marker.
Middle marker.
Outer marker.
10. 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.
1.35 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.
11. Every 10 kt decrease in groundspeed, on a 3° ILS glidepath, will require an approximate
Decrease in the aircraft's rate of descent of 100 FT/MIN.
Increase in the aircraft's rate of descent of 100 FT/MIN.
Increase in the aircraft's rate of descent of 50 FT/MIN.
Decrease in the aircraft's rate of descent of 50 FT/MIN.
12. What approximate rate of descent is required in order to maintain a 3° glide path at a groundspeed of 120 kt?
950 FT/MIN.
800 FT/MIN.
550 FT/MIN.
600 FT/MIN.
13. "Bean bends" in the ILS approach path are?
Curved approaches made with the aid of the instrument landing system.
Curves in the normal approach because of noise abatement.
Slight curves that can be followed by large aircraft.
Curves in the glide path that are visible on the indicator, but change too fats to be followed by large aircraft.
14. 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.
2 and 3.
2 and 4.
1 and 3.
15. The outer marker of an ILS with a 3° glide slope is located 4.6 NM from the threshold. Assuming a glide slope height of 50 FT above the threshold, the approximate height of an aircraft passing the outer marker is
1400 FT.
1300 FT.
1450 FT.
1350 FT.
16. If you are flying a back course ILS, you are flying a?
Non precision approach on the reciprocal runway of the precision approach runway.
Non precision approach on the precision approach runway.
Precision approach on the precision approach runway.
Precision approach on the reciprocal runway of the precision approach runway.
17. Outer marker transmits on 75 MHz and has an aural frequency of
1300 Hz.
400 Hz.
3000 Hz.
2000 Hz.
18. The MIDDLE MARKER of an Instrument Landing System (ILS) facility is identified audibly and visually visually by a series of
Alternate dots and dashes and an amber light flashing.
Two dashes per second and a blue light flashing.
Dashes and an amber light flashing.
Dots and a white light flashing.
19. The ILS marker identified by a series of alternate dots and dashes is the?
Locator.
Middle marker.
Inner marker.
Outer marker.
20. 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.
21. One of the possible disturbances of the ILS signals is "scalloping". Which statement is correct?
Scalloping are rapid 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 minor changes or bends, which can be followed by the aircraft.
Scalloping are minor changes or bends, which cannot be followed by the aircraft.
22. 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 and 2.
2, 3 and 4.
1 and 4.
1, 2 and 3.
23. Performing an ILS approach, you will fly overhead the markers in a specific order. The order is?
IM (if available), MM, OM.
OM, MM, IM (if available).
OM, IM (if available), MM.
MM, IM, (if available) , OM.
24. The audio frequency modulation of the inner marker shall be keyed as follows?
3 dashes, 3 dots, and 3 dashes per second continuously.
A continuous series of alternate dots and dashes.
2 dashes per second continuously.
6 dots per second. Continuously.
25. On final on ILS approach, at 0.6 nm from the threshold, which marker are you likely to hear?
The outer marker.
The middle marker.
The inner marker (if available).
NO markers can be located at this distance.
26. 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
2 and 3.
1 and 3.
2 and 4.
1 and 4.
27. The back CRS of an ILS may give?
Non-precision approach guidance for the reciprocal of the main approach runway.
Non-precision approach guidance for the main approach runway.
Precision approach guidance for the reciprocal of the main approach runway.
Precision approach guidance for the main approach runway.
28. The ILS marker with an aural frequency of 400 Hz is?
Locator.
Inner marker.
Outer marker.
Middle marker.
29. The audio frequency modulation of the outer 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.
30. According to ICAO Annex 10 a locator has a range of?
10 to 25 nm.
7.5 to 15 nm.
75 to 150 nm.
75 to 250 nm.
31. ILS is subject to false glide paths resulting from
Multiple lobes of radiation patterns in the vertical plane.
Back-scattering of anternnas.
Spurious signals reflected by nearby obstacles.
Ground returns ahead of the antennas.
32. The amplitude modulation and the colour of an outer marker (OM) is
1300 Hz, blue.
3000 Hz, blue.
400 Hz, amber.
400 Hz, blue.
33. 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) 35 (ii) 25.
(i) 8 (ii) 10.
(i) 5 (ii) 8.
34. What is the function of the FM-immune filter?
To make both the ILS localiser and the glide slope receiver less susceptible to interference from earth-reflected localiser signals.
To make both the ILS localiser and the glide slope receiver less susceptible to interference from commercial FM-stations (radio and television).
To make the ILS localiser receiver less susceptible to interference from earth-reflected localiser signals.
To make the ILS localiser receiver less susceptible to interference from commercial FM-stations (radio and television).
35. 108.35 MHz can only be?
An ATC frequency.
An ILS frequency.
A NDB frequency.
A VOR frequency.
36. Assuming a five display, what does each of the dots on either side of the ILS localizer cockpit display represent
1.5 degrees.
2.0 degrees.
2.5 degrees.
0.5 degrees.
37. The ILS marker with an aural frequency of 3000 Hz is the?
Centreline marker.
Inner marker (if availale)
Middle marker.
Outer marker.
38. Which facility associated with the ILS may be identified by a two-letter identification group?
Glide Path.
Outer Marker.
Locator
Inner Marker.
39. Concerning the localiser principle of operation in an ILS, the needle of the aircraft indicator is centred when the difference in depth of modulation (DDM) is?
Maximum.
More than 150 Hz.
Null
Less than 90 Hz.
40. The principles of operation of an ILS is?
Modulation of the ILS frequency by amplitude of two modulating signals.
The difference in depth of modulation.
The phase comparison.
The difference between the frequencies of the tow tones.
41. Regarding ILS which of the following in true?
All markers transmit at 75 MHz
The glide path transmitter is located 300m from the departure end of the runway.
The localiser part of the frequency band is shared with the DME.
The DME paried with the ILS channels are usually zero referenced next to the departure end of the runway.
42. 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 4.
1 and 3.
2 and 3.
1 and 4.
43. The localiser transmits in?
The VHF band.
Both the UHF and the VHF bands.
The HF band.
The UHF band.
44. 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 150 Hz modulations.
The bearing of the localiser antenna found by means of a loop antenna.
The difference in time between the 90 Hz and the 150 Hz modulations.
The difference in depth between the 90 Hz and the 150 Hz modulations.
45. If the (angular) displacement of an aircraft (with respect to the localiser centreline) doubles, (e.g. From 1 degree to 2 degrees) measured difference in the depth of modulation?
Increases fourfold.
Remains unchanged.
Doubles.
Is halved.
46. Full deflection on a glide slope indicator indicates that the aircraft is?
0.5 degrees above or below the correct glide path.
0.7 degrees above or below the correct glide path.
2.5 degrees above or below the correct glide path.
1.25 degrees above or below the correct glide path.
47. 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?
4.
3 and 4.
1 and 3.
1.
48. The middle market transmits on?
75 Hz.
75 MHz.
1300 Hz.
1300 MHz.
49. 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 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.
50. Which of these markers has the highest audible frequency?
Outer.
Inner.
Middle.
Airways
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