An aerodrome has several different radio navigation aids available. The NDB has a frequency of 332, the G/S (Glide Slope) has a frequency of 333, and the LOC (Localizer) has a frequency of 109.3. Which of the following statements is true concerning the similarity between the frequencies of the NDB and G/S?
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A
The NDB is 332 kHz in the MF range, and the G/S is 333 MHz in the UHF range.
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B
Pilots should exercise caution when tuning the approach aid frequency to avoid mistakes as the frequencies are very close to each other.
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C
The NDB is 332 GHz in the MF range, and the G/S is 333 kHz in the VHF range.
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D
Both the NDB and G/S operate in the UHF range, with frequencies of 332 MHz and 333 MHz respectively.
Refer to figures.
It is vital that you learn the frequency table as it appears in a lot of questions! You also need to know which navigation aids operate in which frequency band, for this question you need to know that the NDB operates in LF and MF, the ILS Localiser (LOC) operates in VHF and the ILS Glide Slope (G/S) operates in the UHF band. For many questions just knowing that will be enough to answer the question, but some are more involved so make sure you memorise the whole table.
You also need to remember that a frequency need to have a unit attached to it. For example, 333 Hz is not the same as 333 MHz - this would be 333 000 000 Hz. 333 kHz would be 333 000 Hz. The number on its own does not tell you much.
The NDB is 332 kHz in the MF range, and the G/S is 333 MHz in the UHF range --> CORRECT. 332 kHz IS in the MF band, and this is one of the bands in which NDB's operate. 333 MHz IS in the UHF band and this is where the Glide Slope operates.
Pilots should exercise caution when tuning the approach aid frequency to avoid mistakes as the frequencies are very close to each other --> INCORRECT. NDB and G/S frequencies are more than 1000 Hz apart. You cannot tune a UHF frequency in an ADF and you do not tune the G/S at all, it is frequency paired with the LOC frequency (VHF - MHz).
The NDB is 332 GHz in the MF range, and the G/S is 333 kHz in the VHF range --> INCORRECT. Even if the units were correct, the G/S operates in the UHF band.
Both the NDB and G/S operate in the UHF range, with frequencies of 332 MHz and 333 MHz respectively --> INCORRECT. Only the Glide Slope is in the UHF band and the units are incorrect for the NDB.
The attached figures are taken from the AIP entry for EGTE (Exeter, UK) and shows the ILS LOC, G/S, DME and NDB frequencies. However you will notice on the approach plate only the ILS LOC and NDB frequencies appear. This is because the ILS LOC and G/S are frequency paired, and only the VHF LOC is tuned by the pilot. It is also frequency paired with the DME. One frequency, three approach aids. The NDB still needs to be tuned separately.
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This question has appeared on the real examination, you can find the related countries below.
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Italy2
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Germany1
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Poland1
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