What is the principle of operation of a localizer? The localizer (LOC) ground antenna array is located on the extended centerline of the instrument runway of an airport, remote enough from the opposite (approach) end of the runway to prevent it from being a collision hazard. The ILS has a glide slope providing vertical guidance.ĭoes a localizer provide DME? What is LOC localizer in aviation? The ILS localizer is more sensitive than a VOR radial, therefore providing more accurate lateral guidance. You usually aren’t allowed to descend until you are established. What does established on the localizer mean?Įstablished on the localizer simply means you are aligned with the localizer within 4 degrees. The localizer antenna provides lateral guidance, and the glideslope antenna provides vertical guidance. The ILS is a precision approach because it provides both lateral and vertical guidance. What is the difference between ILS and localizer? ![]() This sensitivity permits accurate orientation to the landing runway. With this course width, a full-scale deflection shows when the aircraft is 2.5° to either side of the centerline. The localizer course is very narrow, normally 5°. Two signals are transmitted laterally, one that’s 90 Hz and one that’s 150 Hz. Localizer (Horizontal Guidance) Localizers have an adjusted course width so that they’re 700 feet wide at the runway threshold (full scale fly-left to a full scale fly-right). The field tapers to runway width near the landing threshold. Two modulated signals are produced from a horizontally polarized antenna complex beyond the far end of the approach runway. The localizer broadcast is a VHF broadcast in the lower range of the VOR frequencies (108 MHz–111.95 MHz) on odd frequencies only. ![]() Identifying the station is done by listening to the Morse code over the navigation radio. Before trusting the localizer for navigation, you must identify that the correct station is in use. The localizer transmits a Morse-code ID that typically starts with an “I,” followed by a three-letter code. 1 dot on the localizer represents 0.5° deviation (if 5 dots per side are indicated).
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