Questions tagged [ils]

An instrument landing system (ILS) is a ground-based instrument approach system that provides precision guidance to an aircraft approaching and landing on a runway.

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14
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3answers
16k views

When do pilots disconnect the autopilot on an ILS approach?

In clear weather, when do pilots disconnect the autopilot, if the plane is flying an ILS approach and the autopilot is in "approach" mode (tracking both localizer and glideslope)? Would the answer ...
11
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3answers
2k views

Is it possible for more than one airplane intercept the ILS at the same time?

I was watching a timelapse video yesterday of the approaches on a busy airport (I don't remember which one), and I saw that about 3 or 4 planes were lined up and descending at the same time (they were ...
2
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2answers
801 views

Can the ILS be shut down? [closed]

Can the ILS be manually turned off? Not by the pilots inside the cockpit by simply shutting of the ILS button, but rather by a 3rd party personnel, such as an ATC or a ground crew member. ATC shuts ...
3
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5answers
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Is the ILS only used for landing when weather conditions are poor? [duplicate]

Either I'm missing something, or this article clearly suggests, that pilots are using ILS for landing only in bad weather conditions. Which could lead to an assumption, that in perfectly clear weather ...
9
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1answer
2k views

What's the point of having ILS on runway signs?

Runway signs show the ILS category next to the runway designation. But if you flew and didn't drive to the airport, you already know (hopefully). Either way, you are taking off, so you don't really ...
6
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1answer
398 views

Conducting a Precision Approach on a Non-Precision Runway - What are my limitations?

Let's take ILS, for example. As stated in the FARs, the minimum RVR for a CAT I ILS approach would be 2400ft (1/2 SM) for a runway that does not have TDZ and Centerline Lighting. So, that is one ...
8
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4answers
10k 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?
10
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2answers
831 views

Why haven't helicopter CAT III procedures ever been developed?

Why is there no helicopter equivalent to air transport CAT III ILS? This PPrUNe thread discusses that some helicopter manufacturers have tested coupled approaches down to very low visibility minima (...
-1
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3answers
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What are the procedures and responsibilities concering landing clearances on ILS Cat 2 or 3?

On very poor visibility, the pilot approaches under ILS procedure. Usually they are requested to call the TOWER, when visual with the runway, to receive the landing clearance. However, on ILS Cat 2 or ...
6
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2answers
1k views

Can civil pilots *ever* fly military high-altitude penetration approach procedures?

Let's say I'm flying some business types in a Gulfstream III (an approach category C aircraft) from Stockton to Palmdale to meet up with some USAF types there (new airplane deal, wooo!). Can I accept/...
10
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1answer
8k views

Precision Approach systems: Why is ILS used more frequently than PAR and MLS?

I have studied that the main three systems for performing Precision Approaches (PA) are the ILS (Instrumental Landing System), PAR (Precision Approach Radar) and MLS (Microwave Landing System). ...
20
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4answers
98k views

What is different between a Cat IIIA, Cat IIIB, and Cat IIIC ILS approach?

In terms of aircraft equipment, approach minimums, procedural differences, and anything else relevant, how do the 3 types of a Cat III ILS differ from one another?
4
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1answer
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How do you choose CAT II vs. CATIII ILS?

When should we use CAT II or III during landing in bad weather? What we have in our country the standard shows 800m and RVR of 550 m for the ILS, which category procedure should be used if the ...
7
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2answers
8k views

Which airports have ILS Cat IIIC?

Are there any airports with ILS working CATIIIC? What do the charts for this procedure look like? Is there a missed approach procedure?
12
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2answers
2k views

What is the correct name for this ILS Indicator?

What is the correct terminology for the name of the aircraft instrument that looks like this?
8
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1answer
2k views

Can a pilot use ILS when cleared for a visual approach?

When cleared for a visual approach, do airline pilots still use the localiser/glideslope or GPS or even the autopilot, or is it strictly a "visual" approach?
10
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3answers
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Why would the USAF have no support for autolanding?

One thing I noticed when reading through the KC-10 flight manual (see page 184 for the specific reference) is that the KC-10 lacks support for Category III operations, unlike its civil DC-10 brethren. ...
13
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1answer
1k views

Are zero visibility landings a possibility for the future of commercial aviation?

Airports usually close or slow down activities in fog conditions, e.g. this seems to be a significant problem in winter at Delhi airport. Large commercial aircraft would be able to land with no ...
3
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1answer
269 views

What is the behaviour of ILS when there is an unmodulated interfering carrier signal?

Let us assume we have a localizer (identifier I-STK) transmitting at 110.10MHz and a matching glideslope at 334.40MHz. If a device aboard an aircraft tracking the I-STK ILS were to emit an ...
57
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6answers
16k views

Instrument landing: why do all electronic devices need to be shut off?

A few days ago, I took a flight home. Towards the end of the journey, the captain asked us to shut down any electronic device that we had on board, including iPods, CD players, phones and so on, ...
5
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2answers
801 views

What are the different variants of ILS intrumentation?

Background: I'm a huge aviation enthusiast with a lapsed PPL. Have flown some larger aircraft on MSFS, but never flown anything in real life bigger than a C172. I was lucky enough to do a bit of ...
12
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1answer
2k views

Do non-towered airports commonly have ILS?

Is it common, uncommon or rare for a non-towered airport to have ILS (Instrument Landing System) runways? Can a non-towered airport have ILS?
27
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2answers
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How does ILS (Instrument landing system) work?

How does ILS (Instrument landing system) work? I know it provides guidance to the runway by two signals, one modulated at 90 Hz, the other at 150 Hz, but how the airplane lock on those signals? ...
15
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3answers
3k views

Is it legal to land in bad visibility conditions without ILS?

Korean Air Flight 801 crashed during bad visibility conditions in Guam because the ILS was out of commission and the pilot thought it wasn't. My question though is why he even tried to land there in ...
21
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3answers
5k views

How precise is an ILS (Instrument landing system)?

I read that an ILS is a precision approach system. It provides a final approach with precision in both horizontal and vertical guidance to the runways. But I don't know how precise it is because there ...
16
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2answers
2k views

What is a monitored approach?

I've heard this term used to describe approaches into low weather (e.g. category 2 ILS), what is it? How is this different than an ILS approach?
28
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1answer
10k 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 ...

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