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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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 ...
-2 votes
0 answers
48 views

Glideslope Width measuring

I want to make an inspection of GP system before flight check. The idea is to measure the width of the sector (roughly) by going 200 meters from the GP  and using a lifting platform to measure the DDM ...
0 votes
1 answer
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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 ...
0 votes
1 answer
61 views

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.
1 vote
1 answer
123 views

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)...
2 votes
1 answer
215 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 ...
1 vote
0 answers
86 views

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 ?
1 vote
0 answers
95 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 ?
1 vote
1 answer
843 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 ...
0 votes
2 answers
370 views

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) ...
7 votes
1 answer
311 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 ...
7 votes
1 answer
524 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 ...
11 votes
4 answers
5k views

Why would a PAPI and ILS glide slope for the same runway not coincide?

Some pilots are reporting the glide slope on our PAPI is not coinciding with the glide slope on our ILS even though FAA did a flight check of our PAPI's. Are there any reasons why a PAPI and ILS would ...
13 votes
1 answer
3k views

Why do double-ended ILS runway share the same frequency from both sides?

Let's find a runway where there are localizer-related procedures at both ends, e.g. KMRY: 110.7 for both ILS RWY 10R and LOC/DME RWY 28L KLAX: 108.5 for both ILS OR LOC RWY 06L and ILS OR LOC RWY ...
12 votes
5 answers
2k views

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. ...
5 votes
1 answer
463 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.
1 vote
1 answer
356 views

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 ...
3 votes
1 answer
221 views

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 ...
1 vote
0 answers
66 views

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?
16 votes
1 answer
22k views

What is the purpose of having different ILS categories?

What is the difference between CAT I, II and III ILS approaches? I understand that the different categories are used in different weather, but what are the differences, exactly? Do flight crews have ...
6 votes
1 answer
1k views

Why wouldn't KJFK offer the ILS for 22L?

(Source: Flightradar24) The above was from last Sunday around 17z. I was watching FR24 with the ATC feed. The airport was operating in 'arrival priority' with approaches to both 13L (Canarsie) and 22L....
1 vote
1 answer
417 views

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 ...
10 votes
1 answer
623 views

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 ...
3 votes
0 answers
246 views

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? ...
0 votes
1 answer
378 views

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?
2 votes
1 answer
275 views

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 ...
0 votes
1 answer
208 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 ...
0 votes
1 answer
1k views

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:
1 vote
1 answer
4k views

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.
2 votes
1 answer
215 views

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.
6 votes
5 answers
669 views

Do different planes (category) aim differently in the 'final stages before flaring'?

(youtube.com) Do different planes (categories A through D) aim differently in the final stages before flaring? I'm asking about precision runways. The reasons I ask: An ILS' glide slope is not ...
-1 votes
1 answer
138 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 ...
8 votes
1 answer
3k views

How much does an ILS approach cost?

A statement in this question, asking how to pay fees for using the airport services, without being at the airport, inspires me to ask a question. Quote: (Yeah I know... you gotta pay for an ILS ...
0 votes
2 answers
599 views

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

NOTE: I fly in CANADA. Also, the question is specific to light aircraft like a C172. It is known that the (standard) glideslope flown in an ILS approach is 3o to the T point[1]. However, that is not ...
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 ...
5 votes
2 answers
773 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 ...
10 votes
2 answers
3k views

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 ...
9 votes
3 answers
9k views

Is it true an ILS CAT IIIc can automatically taxi-in an aircraft?

I've always wondered how would the theoretical (since no airport/plane has it) ILS CAT IIIc guide the plane off the runway? I mean from the perspective of radio signals. What component in the ILS ...
32 votes
3 answers
12k 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 ...
1 vote
2 answers
259 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 ...
7 votes
1 answer
364 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 ...
2 votes
0 answers
203 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 ...
3 votes
1 answer
705 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 ...
4 votes
3 answers
675 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 ...
4 votes
1 answer
16k views

Is there a list of airports with Category 3 ILS systems?

Is there a list of airports with category 3 Instrument Landing Systems?
9 votes
2 answers
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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 ...
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 ...
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 ...
1 vote
0 answers
331 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 ...
21 votes
4 answers
129k 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?