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707 Captain >> 707 Captain >> Glide slope dead
https://www.captainsim.org/forum/csf.pl?num=1341132938 Message started by dt on Jul 1st, 2012 at 8:55am |
Title: Glide slope dead Post by dt on Jul 1st, 2012 at 8:55am
Sometimes on ILS approach glide slope deviation shows 'above G/S' constantly on approach. I could follow it to the ground and still be 'above G/S' on approach. Problem seems to be random. I took off from Heathrow (EGLL), flew to Manston (EGMH) with GPS DirectTo, activated GPS vectors to final on 28 and did ILS approach with autopilot. Glide slope was showing proper reading and autopilot followed ILS perfectly. Go around and repeat with hand flying and same result - glide slope showing proper reading. Then flew back to Heathrow with GPS DirectTo, activated GPS vectors to final 27L. This time glide slope was constantly showing 'above G/S', even though I was below or at glide slope.
i1198.photobucket.com/albums/aa457/depenthene/egllgs1.jpg i1198.photobucket.com/albums/aa457/depenthene/egllgs2.jpg Checked Heathrow ILS with slew and got correct glide slope. I had same problem in various different airports too (PHNL, KORD, PANC, EFHK), but problem is not probably the airports since never had problem with other aircraft on glide slope. I can't seem to recreate problem or circumstances leading to it. Anyone else experience anything like this? |
Title: Re: Glide slope dead Post by windplayer on Jul 1st, 2012 at 10:23am
Something new to me. But most of my day time landings with good weather i do by PAPI\VASI lights. I'll check it.
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Title: Re: Glide slope dead Post by CoolP on Jul 1st, 2012 at 6:42pm dt wrote on Jul 1st, 2012 at 8:55am:
Not yet. Looks like a tricky thing with that random occurrence. :-/ |
Title: Re: Glide slope dead Post by dt on Jul 1st, 2012 at 7:31pm
Had same problem doing ILS to EFHK 15, but glide slope became active during on final. I did switch momentarily AP to AUTO GS, but not sure it was the thing that fixed the problem. Looking more into it.
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Title: Re: Glide slope dead Post by CoolP on Jul 1st, 2012 at 7:48pm
Perhaps you need to toggle the AP mode once. Lou mentioned that before. This forces a reinitialization of that system.
Read this post on the details with that internal timer while using AUTO. http://www.captainsim.org/yabb2/YaBB.pl?num=1234458523/65#65 It's related to the 727, but I guess the 707 AUTO and MAN thingy acts in the same manner. LOU wrote on Oct 28th, 2010 at 2:50am:
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Title: Re: Glide slope dead Post by dt on Jul 1st, 2012 at 8:11pm CoolP wrote on Jul 1st, 2012 at 7:48pm:
Thank you for the information. Have to try play with AP on approach, if I only could figure out what circumstances causes the problem to appear. Never had same problem with CS727 or 737, could be FSX problem too. |
Title: Re: Glide slope dead Post by LOU on Jul 1st, 2012 at 8:47pm
Most of the time any of the planes do a good job of tracking the LOC & G/S.
I say most of the time because every so often a fruitron gets lost and all the other fruitrons seem to get tired as well. When this happens, I do what the guy did in the video CoolP posted in general section. ;D Lou Is this your instillation? :o I'm just asking... ;) Uploaded with ImageShack.us |
Title: Re: Glide slope dead Post by CoolP on Jul 1st, 2012 at 9:10pm
Yeah, looks like my last one. :-/
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Title: Re: Glide slope dead Post by Markoz on Jul 2nd, 2012 at 3:59am LOU wrote on Jul 1st, 2012 at 8:47pm:
Yikes! My wife would have me "drawn and quartered" if my computer looked like that! :o |
Title: Re: Glide slope dead Post by BrianG on Jul 2nd, 2012 at 4:43am
DT,
I used to have that problem as well. By accident I found the cause was running the AP in Nav mode when using the Doppler or GPS. If I disengage the AP to land by hand while the AP was still in NAV mode, my GS would act exactly as you described. I found the solution was to flip it from Nav Mode to LOC/VOR before you disengage the AP. Then the GS would come alive and function as it should. Auto landings worked fine. It was just failing to go from Nav to LOC/VOR before turning off the AP for a manual landing is where the problems would start |
Title: Re: Glide slope dead Post by dt on Jul 2nd, 2012 at 6:15am BrianG wrote on Jul 2nd, 2012 at 4:43am:
That was exactly the problem and like you said solution was to go to LOC/VOR before disengaging AP. Thank you. |
Title: Re: Glide slope dead Post by BrianG on Jul 2nd, 2012 at 2:18pm
Glad it works for you now. I struggled with that one for a long. Enjoy.
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Title: Re: Glide slope dead Post by windplayer on Jul 2nd, 2012 at 10:21pm
Guys! i just made some circles in 707. Another question appeared.
Looks like F\D in NAV\LOC, GS AUTO\MAN turns off GS indicator just like in upper posts. I never used F\D really, and today i wanted to dig it, and thats what i found. Is that supposed to be like that? (I flew by hand) |
Title: Re: Glide slope dead Post by LOU on Jul 3rd, 2012 at 1:56am
That is not the way it is supposed to work.
I never use the F/D in the 707 or the 727 because there is a bug in there somewhere. Lou |
Title: Re: Glide slope dead Post by CoolP on Jul 3rd, 2012 at 7:07am
So far, I was happy with the FD on the 707 when on the ILS. In another thread, I took some screenshots and the GS indicator and FD indication worked fine. www.captainsim.org/yabb2/YaBB.pl?num=1315732558/17#17
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Title: Re: Glide slope dead Post by windplayer on Jul 3rd, 2012 at 7:16am
Yep. VOR hold mode works in 707. At least something to use in low vis.
Did CAT II require use of A\P down to DH back in 70's-80s? Or you could hand-fly? |
Title: Re: Glide slope dead Post by windplayer on Jul 3rd, 2012 at 8:08am
Anyway, i'll fly it again today. Im working on cross-controling on landing, to land on centerline, so doing a lot of circles ;)
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Title: Re: Glide slope dead Post by LOU on Jul 3rd, 2012 at 1:48pm
Windy asked...
Did CAT II require use of A\P down to DH back in 70's-80s? Or you could hand-fly? To fly a CAT-II approach you needed the following: Autopilot and one flight director with dual display or.... Hand flown with dual flight directors and auto thrust. As I've said before the 707's F/D was nowhere near as good as the 727. I guess a few years of advancement in electronics makes a big difference. Lou |
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