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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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What is, precisely, the function of far field monitor in ILS?

For what I have understood, far-field monitor (FFM) is composed by a set of antennas that receive the signal from the localizer, and check its integrity. The checking is made by extracting the DDM ...
Night In Metro's user avatar
0 votes
1 answer
111 views

What is this crossbow-shaped flight path? [duplicate]

While headed to lunch yesterday I spotted a small aircraft flying low overhead. I didn't think too much of it until a few minutes later the exact same plane flew over again in the exact same spot! I ...
2012rcampion's user avatar
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1 answer
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ILS Frequency Assignment In Dual Nav Radio Setup

With a dual Nav radio setup (On autopilot panel) does the ILS frequency of the runway you're about touch down on need to be entered into both radios or just one? Cheers.
Seaharrier's user avatar
2 votes
1 answer
220 views

Localizer beam protection

During mixed operation, will an aircraft crossing the end of the runway affect the localizer transmission? (Istanbul airport, source.) For instance, when runway 17L is in use, will an aircraft ...
ilayda's user avatar
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Question about ILS approach categories

I was reading about FAAs ILS approach categories minimums and have a question! Category II. DH 100 feet and RVR 1,200 feet (with autoland or HUD to touchdown and noted on authorization, RVR 1,000 feet)...
Breaach's user avatar
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Obstacle clearance altitude and decision height

can someone explain does OCA that is written in charts coresponds to DA for airlines (its the same altitude), or does airlines choose different DA for example CAT I approach ?
Edvin Simic's user avatar
1 vote
0 answers
97 views

MOC for CAT III missed approach segment

Hello what is the MOC (minimum obstacle clearance) for missed approach segment for CAT III ILS minimum ?
Edvin Simic's user avatar
1 vote
1 answer
890 views

How do you capture the localizer in an A320?

I understand that pushing 'Approach' should do it (when in range), but it doesn't. There must be another step that I'm missing (the computer has been set up so it's not that). What is the step-by-step ...
Cloud's user avatar
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How do you know what altitude to be at for "APPR" mode to work?

How would you know what altitude to be at to capture the glideslope on an autopilot RNAV or ILS approach? (I am mainly focused on MSFS airliners, but this could apply to other planes or in real life) ...
DaCuteRaccoon's user avatar
7 votes
1 answer
318 views

Why is my WAAS equipped aircraft telling me to descend sooner than the FAF (KDVT 25L LPV)

I ran into a weird issue today with our G1000 WAAS-equipped aircraft. The aircraft wanted me to begin decent .9nm before the FAF on the KDVT 25L LPV approach. The LPV is considered a non-precision ...
Jonathan Wilkinson's user avatar
7 votes
1 answer
526 views

What do the "GP 330.5" and "CH24X" I marked in the picture below mean?

What do the "GP 330.5" and "CH24X" I marked in the picture below mean? I think 330.5 is localizer independent glidepath frequency but I have no idea what CH24X means. Does anyone ...
pilot162's user avatar
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If we are cleared for an ILS approach, can we descend according to the approach chart?

For example VCBI,ILS Z 04. We have ATC clearance: Descend and maintain 2300 feet, Cleared ILS RWY 04 approach. Can we descend as profile 1700 and then 1500, and intercept glide path? Or maintain ...
afanti's user avatar
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What factors determine the DA(DH) and RVR/VIS of an ILS approach?

Look at the jeppesen chart of “VCBI-ILS Z Rwy 04 ”. why the DAs are more than 200+RwyElev,and RVRs are more than 550m, What factors determine the DA(DH) and RVR/VIS of an ILS approach?
afanti's user avatar
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3 votes
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Why are the altitudes and distances in the profile view different when calculated with the fpm values in the conversion table on Jeppesen charts?

Why are the altitudes and distances in the profile view different when calculated with the fpm values in the conversion table on Jeppesen charts? To put it more simply, I find the distance between ...
pilot162's user avatar
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After tuning and identify an ILS, do you mute the audio? How/where do you hear marker beacons?

I've practiced tracking an VOR radial in VFR conditions with a CFI. We tuned and identified the VOR, muted the Morse code, set the OBS, and then followed the CDI needle indications. I have not used a ...
Azendale's user avatar
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How much obstacle clearance is provided within full scale deflection below glide slope on ILS?

Basically the question in the title. The military has regulations that say to obey the localizer minimums if more than have scale deflection below glide slope, but for civilians how much obstacle ...
Name's user avatar
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Why is there no final approach fix symbol on some of the Jeppesen VOR charts? (Maltese Cross Symbol)

Why is there no final approach fix symbol on some of the Jeppesen VOR charts? (Maltese Cross Symbol) What does the box marked with a red arrow mean when there is no FAF symbol and how is it defined? ...
pilot162's user avatar
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Why if you tune localizer frequency the glide slope is tuned too?

if tuning the ILS you tune localizer freq which is between 108 MHz to 111.975 MHz. why the glide slope freq which operates in the 328.6–335.4 MHz band is tuned simultaneously?
Filip Adam's user avatar
0 votes
1 answer
221 views

Which one is racetrack? Isn't it a holding over VOR on the left and holding over FIX on the right?

Which one is a racetrack? Isn't it a holding over VOR on the left and holding over FIX on the right? If one of them is a racetrack, how is it different from holding? Or are they both used in the same ...
pilot162's user avatar
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What are the meanings of the numbers "4500" written under the VOR and NDB boxes? (MHA?) (Recommended crossing altitude?)

Does it directly mean the minimum altitude for holdings on VOR or NDB or can it be interpreted in another way? Because MHA 4500 information for the holding is given on the right side. This picture is ...
pilot162's user avatar
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What is this black star symbol in the picture below? If it means a hazard with no altitude information, what kind of hazard is that?

What is this black star symbol in the picture below? If it means a hazard without altitude, what kind of hazard is that? A separate picture of similar symbol with altitude information:
pilot162's user avatar
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What is MEHT (minimum eye height over the threshold)?

What is MEHT (minimum eye height over the threshold)? I can't find the definition and how to use it.
pilot162's user avatar
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2 votes
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What are the meanings of the codes depicts in the square brackets? For example: [MDØ68]

I always see these codes inside of the square brackets with different charts. Especially I wonder about the meaning of Ø.
pilot162's user avatar
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5 votes
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471 views

Why is there no Maltese Cross in this non-precision approach's profile view which has a FAF?

I am wondering why this chart does not show the FAF with a maltese cross as it is used in non-precision approaches to depict FAF.
pilot162's user avatar
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-1 votes
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139 views

How does an aircraft work with ILS [closed]

In what situation will an aircraft show you "LOC*" in FMA? What signal does the aircraft received when LOC*?(how does the aircraft know it is on LOC*) And which heading will the aircraft ...
William Cat's user avatar
0 votes
1 answer
213 views

Crossing extended runway centerline while intercepting LOC

I know it shouldn't happen but in case it happens for whatever reason, what is correct procedure to save the day. I mean the case that the aircraft is turning but it gets to the wrong side by, let's ...
pzag's user avatar
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3 votes
3 answers
739 views

Why are visual and ILS approach angles for a Cessna 172 often different?

NOTE: I fly in Canada. Also, the question is based on my experience on light aircraft like a C172. It is known that the (standard) glideslope flown in an ILS approach is 3°. However, that doesn't ...
PapaMike99's user avatar
5 votes
2 answers
780 views

What is the speed of the approach lights rabbit?

If you were flying past the rabbit and passed each bulb as it lit, what speed would you be flying at? The rabbit is 2400 feet long, spaced at 100 foot increments and consists of 15 lights. The math ...
Asher S's user avatar
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ILS Approach, when can you descend on the glide path?

The following quote is from G. Bristol’s book, Ace the Technical Piloting Interview: You can descend on the glide path when You have been cleared for the ILS procedure. You have captured the ...
tedioustortoise's user avatar
1 vote
2 answers
261 views

If the glideslope signal is higher than it should be, can I continue the approach? [duplicate]

When I'm passing Precision Final Approach Fix, if my glideslope is two dot above, and my altitude is at PFAF altitude, can I continue my approach with this glideslope signal? Is it legal? I think the ...
moon's user avatar
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7 votes
1 answer
382 views

What would a Category II ILS approach require that a Category III approach wouldn't?

According to @RalphJ's first comment on my earlier question about ILS approaches in an E-Jet sans pitch trim: Are you sure that Cat III approaches are allowed in that condition? Typically, Cat III ...
Vikki's user avatar
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2 votes
0 answers
207 views

What are the operational differences between the ILS CATs? [duplicate]

I know ILS CAT is classified by DH, and RVR, but I want to know what's difference between ILS CAT operationally. For example, CAT 3 approach should be autolanding. (I am not sure) And, if RVR is 600m ...
Min's user avatar
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3 votes
1 answer
713 views

Can a Localizer Backcourse signal be reversed (at the site antenna)?

Can the two Localizer Backcourse signals (90Hz and 150 Hz) be reversed (at the site antenna) eliminating reverse needle sensing when flying a Localizer Backcourse approach? If so, are there any ...
user avatar
4 votes
3 answers
681 views

Interpreting Missed Approach Section in Jeppesen Chart

While interpreting an RKPS(airport located in South Korea) LOC DME 06L, I found it somewhat confusing. As you see, the initial action of the missed approach is climbing via heading 063 to GIDOO. I ...
moon's user avatar
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10 votes
2 answers
5k views

What should I do if I intercept the glideslope before reaching the final approach fix?

On several of the ILS and RNAV LPV approaches in my area (and notably the ones I expect for my checkride), I consistently intercept the GS at 0.1-0.2nm before the FAF. An example: I am flying at ...
StephenS's user avatar
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6 votes
3 answers
3k views

If cleared for an ILS approach at the Initial Approach Fix, where should I intercept the glideslope?

I am a brand new Instrument Pilot and the answer that I am looking for is related to good technique and not necessarily not what is legal or not. My instructor taught me that when flying an approach ...
DLH's user avatar
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4 votes
2 answers
3k views

Why is the LOC RWY 26 approach at Innsbruck classified as LOC instead of ILS or IGS?

After reading about Localiser Type Directional Aid (LDA) and Instrument Guidance System (IGS) on SKYbrary, my understanding of classifying these approaches is this: Course Offset With GP Without GP ...
Bianfable's user avatar
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1 vote
0 answers
336 views

Is it necessary to switch from VFR to IFR when using ILS approach?

I have flown at an airport and asked for vectors for an ILS approach in VMC for practice. But the controller refused to give me vectors and told me that I could only have a visual approach. I got the ...
Stanislav Zubar's user avatar
2 votes
0 answers
2k views

Is there any latest List of CAT IIIB airports in the world?

Recently I had my very first CATIIIB experience at my own homebase (VILK) and since then I've been keen to know more about this most advanced landing system we have in the aviation as of now and given ...
Avgeeker's user avatar
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1 vote
1 answer
148 views

What ILS type approach my flights landing could be?

I had one of the foggiest landing experiences recently and I'm interested if any of you could guess what type of ILS could it be like CAT I,II,IIIA or IIIB? So the METAR issued 9 minutes before my ...
Avgeeker's user avatar
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5 votes
2 answers
311 views

Can autopilot track ILS without any internal heading reference?

I am asking about the internal design of the autopilot of a CRJ200 (no autoland). I was flying an ILS approach when the AHRS heading started to drift rapidly by 30 degrees. The autopilot somehow was ...
Andrius's user avatar
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10 votes
1 answer
777 views

Why would an ILS have a glide path angle less than the preferred 3°?

According to EASA the preferred Glide Path Angle is 3°: EASA Easy Access Rules - Page 22 - 4.1.2.1. There are some airports (e.g. Larnaca 2.75°) which are using a lower Glide Path Angle than 3°. Using ...
Pascal's user avatar
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2 votes
1 answer
2k views

Are both RVR and visibility minimum required for CAT I ILS?

Is it required to have both RVR and visibility to be more than minimum for ILS CAT 1 or one of them is acceptable. If both required which one has priority.
Sid's user avatar
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5 votes
1 answer
1k views

What is ILS CLASS in this airport NOTAM?

I have seen this NOTAM for UAII /CIT SHYMKENT airport and they mention ILS CLASS for runway 10/28, Does anyone knows what it means? NOTAM: NOTAM K3998/20: Shymkent Airport (UAII) K3998/20 NOTAMN Q) ...
Islam Elsayed's user avatar
1 vote
4 answers
4k views

How do I know which airports have ILS and for which runways?

I have been into flying for years but something I can't figure out is how do I, as a pilot, know if an airport I am going to has ILS, which runways would have it and why do only some have it but the ...
Marty Waskowski's user avatar
0 votes
2 answers
148 views

Why is the ILS16 approach at KSKF not available in my Garmin 430W?

I am doing flight instruction on the San Antonio area (Texas) and I've been shooting different approches on the vecinity airports. One of the approaches I usually execute is the ILS 16 at KSKF, which ...
Ivan Parra's user avatar
10 votes
1 answer
421 views

Why are different distances listed for the ILS and the LOC on this approach chart?

Maybe someone has an idea why are there two separate distance values (marked in blue) for ILS and LOC approaches?
Julious's user avatar
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2 votes
0 answers
121 views

Why is the ILS 36R approach at ZBAA over twice as long as a standard ILS approach?

I fly exclusively in a consumer flight simulator, so excuse me if there's an obvious answer to this. ILS approach plates typically show a long, arrow-like symbol to indicate the part of an approach ...
Jules's user avatar
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6 votes
2 answers
14k views

How to choose the right ILS when the runway has more than one?

I'm wondering how is the right choose when an runway has ILS x, Y, Z. What should I consider in order to pick one of those for landing?
Diego Adum's user avatar
17 votes
1 answer
3k views

Does a portable ILS ground station exist?

Does anyone know of a good example of a portable ILS ground station? I mean, it can be used for temporary airfields.
Peter's user avatar
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