![]() Glide slope only approved to DA below that use only with visual supplementation 7° - Glide slope is more sensitive closer to the runway - Glide slope signal width - 5nm=350’ width 3nm=210’ and 1nm=70’ - At OM each dot of deviation is approx 50’ excursion at the MM one dot is 8’ deviation - Goal is touchdown at touchdown zone ≈ 1000’ past the threshold while passing over threshold at TCH ILS – Glide Slope - Glide slope is generally at a 3° slope (300’ per nm) - Glide slope width is 1.4° - 3 X more sensitive than the localizer and 12 X more sensitive than a VOR - hence full scale deflection is. Course width is up to 35° from 10nm to the runway Localizer signal is normally usable up to 18 NM from the field with a course width of 14° from 10 to 18nm. Localizer identifier is a three-letter identifier preceded by the letter I- CDI works by comparing strength of blue and yellow signals (90 and 150 Hz signals). Near the Middle Marker, one dot means you're off course by 150 ft. a short runway will have a wider angle) - ILS is always aligned with the runway - Near the outer marker, a one-dot deviation puts you about 500 ft. Localizer course width is 3° to 6° (full scale – one side to the other) - Actual width varies to assure 700 feet full scale course width at runway approach threshold - based upon runway length and localizer antenna location (e.g.
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