Questions tagged [glideslope]

A radio navigation aid which provides vertical guidance during an approach; generally used as part of an ILS installation.

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4answers
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How is the glideslope intercepted on final approach? [closed]

On ILS, If you're low you pitch down and reduce power, and if you're high you pitch up and add power. I'm assuming it works like this; --- If you pitch up without adding power, You will intercept the ...
2
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1answer
155 views

How to calculate or design glide ratio? [duplicate]

Was interesting to watch the explanation about glider here, especially about the glide ratio. Glide ratio is defined as the ratio between altitude when it start gliding (Y-axis) to the distance it can ...
7
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3answers
229 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 ...
1
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3answers
298 views

Can someone explain this glideslope question?

The glideslope deviation bar is covering the second upper dot. The required action to meet glideslope beam is to: What does this question mean?
5
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1answer
306 views

What is the reference plane for the ILS glideslope angle?

Is a 3-degree glideslope based from the runway surface slope at the point where the antenna is installed or is it referenced to a zero-degree plane? If you know of a design document or FAR/AIM ...
2
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1answer
181 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
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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 ...
8
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4answers
8k views

Can the ILS glideslope be intercepted from above?

Is it recommended to intercept the ILS glideslope from above? Are there any special considerations like unstable approaches or GPWS warnings?
28
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1answer
8k views

What is the behavior of false glideslope signals?

I know that an ILS transmits not only the correct glideslope but also signals that can be interpreted as a false glide path. But I'm not familiar with the details of these erroneous indications. What ...