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7
votes
3answers
265 views

Why can a localiser be used without a glideslope, but not vice versa?

An ILS consists, at its most basic, of two components: a localiser (to provide lateral guidance) and a glideslope (to provide vertical guidance). The two are typically used together, for an ILS ...
2
votes
1answer
187 views

What are the procedures for flight checking a glideslope and localizer?

What are the FAA and ICAO requirements and procedures for flight checks and calibration of glideslope and localizer transmitters? I'm interested in both the engineering and piloting aspects.
8
votes
4answers
1k views

Why do localizer/glideslopes use 90/150Hz specifically?

Why is it that localizer and glideslope system are using 90 Hz and 150 Hz frequencies only, instead of some other LF such as 75 Hz? Part two of my question: How does the modulation depth differ for ...