Simviation Forum - ILS useless at some airports?

Apr 8^th, 2004 at 4:22am

RIC_BARKER Offline
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I've been spending alot of time recently flying in IMC, and is it just me, or are some of the ILS glideslopes/localisers not in line with the runways at some major airports?

I just tried an approach into EGCC, and I was consistently guided in several feet to the left, and I always seem to be at about 100ft when over the threshold.

Has anyone else noticed a similar problem at any other (default) airports?

Ric B.

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Reply #1 - Apr 8^th, 2004 at 4:44am

BFMF Offline
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There's a quite a few offset localizers Roll Eyes

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Reply #2 - Apr 8^th, 2004 at 4:44am

RollerBall Ex Member

Hi Ric

There were quite a few offset ILSs in 2002 so I guess they were passed over into 2004

Obvious solution is to check out the problem ones with AFCAD2 and see if you can modify em to suit. Couldn't do that with 02 but it's easy with 04

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Reply #3 - Apr 8^th, 2004 at 5:17am

RIC_BARKER Offline
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Cheers guys....glad to know it's not just me then! I though I was going loopy! Grin

Ric B.

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Reply #4 - Apr 8^th, 2004 at 6:48am

Billerator Offline
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Yeah some of the ILS beams are not 'perfect'.
Though some are not certified for total 'whiteout' conditions.

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Reply #5 - Apr 8^th, 2004 at 7:29am

RIC_BARKER Offline
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Quote:

Yeah some of the ILS beams are not 'perfect'.
Though some are not certified for total 'whiteout' conditions.

All ILS systems have to meet certain criteria in the real world. They all have to be accurate. It's the aircraft themselves that are certified at Cat I / Cat II / Cat III minima, which is the deciding factor in what weather they can land in.

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Reply #6 - Apr 8^th, 2004 at 10:46am

codered Offline
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It is possible to have offset ILS systems. Some airports have instrument approach systems, but they are offset due to buildings, mountains, etc. These are not great for 1/4 mile visibility conditions. Innsbruk and Ronald Regan have offset ILS approaches. So it might not be a bug in FS9.

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Reply #7 - Apr 8^th, 2004 at 3:20pm

Billerator Offline
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Sorry Its just the fact that the ILS systems say if they are cat II, III, or I in the sim.
Im sure that the ILS beams vary in category too.

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Reply #8 - Apr 8^th, 2004 at 3:49pm

RIC_BARKER Offline
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Quote:

It is possible to have offset ILS systems. Some airports have instrument approach systems, but they are offset due to buildings, mountains, etc. These are not great for 1/4 mile visibility conditions. Innsbruk and Ronald Regan have offset ILS approaches. So it might not be a bug in FS9.

Yeah, I'm aware of the offset ILS approached at some airports. EGCC isn't one of them though - I'm talking about where the ILS thinks the runway is somewhere else.

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Reply #9 - Apr 9^th, 2004 at 1:27pm

hiflyphil Offline
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Don't forget to press <cntr>+<b> to correct your altimeter. Just a few millibars difference can give you false readings of tens or even hundreds of feet.

Oh and theres no substitute for your own two eyes 8)

Grin

Phil

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Reply #10 - Apr 9^th, 2004 at 1:36pm

Nexus Offline
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Quote:

Don't forget to press <cntr>+<b> to correct your altimeter. Just a few millibars difference can give you false readings of tens or even hundreds of feet.

Grin

Phil

I'm very interested to hear how that can have any effect on the localizer Wink

And remember, the actual ILS receiver on aircrafts don't need to know the current altimeter, they will show the same deviations regardless if your QNH is set at 29.70 or 30.20 etc.

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Reply #11 - Apr 9^th, 2004 at 3:27pm

codered Offline
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Agreed.... Grin

I have no doubt that some of the ILSeses are off by a bit or a lot in FS. Since we are no longer talking about Off set ILS approaches. I think AFCAD is the solution to fix the airport that you find has a bad approach. Grin

Isn't the FAA (in the US anyway) supposed to fly all the approaches with their King Air to see if they are all working properly? Grin

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