On the CYHM ILS 12 approach plate, what is the ILS frequency?

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Multiple Choice

On the CYHM ILS 12 approach plate, what is the ILS frequency?

Explanation:
The important idea is how an ILS approach uses a localizer frequency to provide lateral guidance to the runway. The localizer is a VHF transmitter, and you tune the aircraft’s NAV radio to the exact localizer frequency shown on the approach plate. Localizer frequencies lie in the range 108.10 to 111.95 MHz in 0.05 MHz steps. For the CYHM ILS 12 approach, the published localizer frequency is 110.90 MHz, which is why this is the correct choice. The other numbers don’t fit the localizer band: 266 and 397 are outside the VHF navigation range, and 117 is not the localizer frequency for this plate.

The important idea is how an ILS approach uses a localizer frequency to provide lateral guidance to the runway. The localizer is a VHF transmitter, and you tune the aircraft’s NAV radio to the exact localizer frequency shown on the approach plate. Localizer frequencies lie in the range 108.10 to 111.95 MHz in 0.05 MHz steps. For the CYHM ILS 12 approach, the published localizer frequency is 110.90 MHz, which is why this is the correct choice. The other numbers don’t fit the localizer band: 266 and 397 are outside the VHF navigation range, and 117 is not the localizer frequency for this plate.

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