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 25 How to ... AUTOPILOT. The only thread. (Read 229603 times)
elysion
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Re: 757 Autopilot
Reply #225 - Apr 12th, 2011 at 4:25am
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signmanbob wrote on Apr 24th, 2008 at 3:23am:
Yes, make sure you properly set your IRS before leaving the apron.  Nothing will work right (like the real thing) without that set.
My autopilot works absolutely perfect.  I have done several full CATIII auto lands with all three CMD lights on, LAND 3 illuminated on the AUTOLAND STATUS Annunciator and full FLARE engaged.  
If I'm not having any problems with it, then there can't be anything wrong with that feature of the software.  It must be something else.


hi mate , sorry for popping-in, does that mean I would need to switch on all 3 autopilot CMD switches above the disengage switch?
sometimes i cant switch on the vnav is thsi due speed restrictions?
thanks
  
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Markoz
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Re: 757 Autopilot
Reply #226 - Apr 12th, 2011 at 11:11am
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elysion wrote on Apr 12th, 2011 at 4:25am:
hi mate , sorry for popping-in, does that mean I would need to switch on all 3 autopilot CMD switches above the disengage switch?
sometimes i cant switch on the vnav is thsi due speed restrictions?
thanks

From the time you turn the Autopilot on, you only need to push one of them (I use the center one most of the time). Once the Autopilot is switched to APP and the 757 gets close enough, the other two CMD buttons will light up and LAND 3 will illuminate on the AUTOLAND STATUS Annunciator.
I have never been able turn all 3 CMD buttons ON. So I assume that the FMC/MCP does. Wink

Mark
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #227 - Apr 12th, 2011 at 4:51pm
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That is not the way I remember it working in the real plane.
Once established on the approach, LOC & G/S captured, then push the other two autopilots to go into auto land mode.
If you leave just one autopilot engaged it would be just a normal ILS to disconnect at DH.
  

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Re: 757 Autopilot
Reply #228 - Apr 13th, 2011 at 10:56am
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Markoz wrote on Apr 12th, 2011 at 11:11am:
elysion wrote on Apr 12th, 2011 at 4:25am:
hi mate , sorry for popping-in, does that mean I would need to switch on all 3 autopilot CMD switches above the disengage switch?
sometimes i cant switch on the vnav is thsi due speed restrictions?
thanks

From the time you turn the Autopilot on, you only need to push one of them (I use the center one most of the time). Once the Autopilot is switched to APP and the 757 gets close enough, the other two CMD buttons will light up and LAND 3 will illuminate on the AUTOLAND STATUS Annunciator.
I have never been able turn all 3 CMD buttons ON. So I assume that the FMC/MCP does. Wink

Mark


Thanks Mark, today i was using the middle CMD button, all fine, however, i did a 180 degree turn before capturing the LOC and ILS approach, before ILS approach i hit LOC but it did not automatically centre as it should also the appr button did not execute and auto land, nav radio was correctly set though in FMC, might it be that i overshoot the ILS already and it did not captchure therefore?
However, I was before the IAF and it should have captured it right?
with the FSX planes i had sometimes the issue that whilst still descending app would not work always, might have been the problem too?
anyways i made it with a -77ft/ touchdown and 4600lbs fuel left...thanks for your reply Mark
  
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Re: How to ... AUTOPILOT. The only thread.
Reply #229 - Apr 13th, 2011 at 11:54am
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You might have missed the GS as well. If I (God forbid) forget to press APP when just below the GS, and I when I DO remember to press it, I'm sometimes too late and too high. In those cases, I have to GO-AROUND. Sad

It hardly ever happens now, but when I first started using the heavies, it was a regular occurrence. Embarrassed

Mark
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #230 - Apr 13th, 2011 at 2:16pm
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Markoz wrote on Apr 13th, 2011 at 11:54am:
You might have missed the GS as well. If I (God forbid) forget to press APP when just below the GS, and I when I DO remember to press it, I'm sometimes too late and too high. In those cases, I have to GO-AROUND. Sad

It hardly ever happens now, but when I first started using the heavies, it was a regular occurrence. Embarrassed

Mark


There is no requirement to press LOC first and then APP.
  One reason to select LOC  and not APP is because approach may have only cleared you to intercept the LOC and not the full ILS.
   If you are cleared to intercept the localizer select LOC, then when cleared for the approach you should select APP. If you forget to push APP and notice yourself above GS you can, if your high enough, go vertical speed to say 1200 and recapture GS.
   As Lou stated the selection of three autopilots is not modeled correctly, which I don't is that big of a deal. I would rather see VNAV
approches fixed. You should manually select each autopilot if you want to autoland.
  The three autopilot setup is an FAA requirement to autoland at low vis. You could select two autopilots and it would autoland but you wouldn't be legal to go down to 300 RVR.
  At 300 rvr you will not see the runway until close to nosewheel touchdown.

  
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Re: How to ... AUTOPILOT. The only thread.
Reply #231 - Apr 13th, 2011 at 3:30pm
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What he said!  Wink
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #232 - Apr 13th, 2011 at 4:41pm
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I have always use LOC before APP. There were times when in the rush to complete tasks I was not familiar with, back then, that I sometimes forgot to press APP. The best thing for me to do, was to do a Go-Around, or else I was most likely going to crash (thank goodness I was only flying in FSX)! I haven't had anything like that happen in a very long time. Grin

It's obvious that none of my other advanced heavies are correct then, when it comes to the requirement for me to press the remaining autopilot CMD buttons. They all automatically turn them on and then LAND 3 lights up. To be honest, until just now, I assumed that was how they worked in real life. Shocked

Mark
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #233 - Apr 14th, 2011 at 1:37am
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OK, this is probably more than you wanted to read, but have a look...

757 Auto Flight - http://www.biggles-software.com/software/757_tech/automatic_flight/afds.htm

There is a ton of data to study on these pages....have fun!  Smiley
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #234 - Apr 14th, 2011 at 2:33am
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I remember some planes having set the airline option to catch a glide before the Loc (if received) while other ones where looking for the Loc first, not allowing the glide capture before.
  
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Re: How to ... AUTOPILOT. The only thread.
Reply #235 - Apr 14th, 2011 at 5:02am
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Markoz wrote on Apr 13th, 2011 at 4:41pm:
I have always use LOC before APP. There were times when in the rush to complete tasks I was not familiar with, back then, that I sometimes forgot to press APP. The best thing for me to do, was to do a Go-Around, or else I was most likely going to crash (thank goodness I was only flying in FSX)! I haven't had anything like that happen in a very long time. Grin

It's obvious that none of my other advanced heavies are correct then, when it comes to the requirement for me to press the remaining autopilot CMD buttons. They all automatically turn them on and then LAND 3 lights up. To be honest, until just now, I assumed that was how they worked in real life. Shocked

Mark


Mark
I agree with you on the LOC and APP order and the three CMD buttons and LAND 3 coming on automatically and at the same time. If I forget to press APP and miss the G/S and end up above it I will attempt to capture it from above with a V/S of -2000 to -2500 to a altutude hold around 500 feet. Almost all of my landings are at sea level. I would hate to think of trying an altitude hold of 500 at KDEN - - SPLAT.

Michael Cubine
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #236 - Apr 14th, 2011 at 6:49am
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Hi Michael.

It always best for me to Go-Around than to try a catch up with a mistake that will, in all likelihood, end with me having a hitting that runway way too hard. I know this because it happened to me twice! Just remember that this was back when I first started flying the heavies. Grin

Mark
  

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Re: How to ... AUTOPILOT. The only thread.
Reply #237 - Apr 14th, 2011 at 3:09pm
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It is always better to go around and take your time to set up the approach.

What is wrong with the little black button on the yoke? Disconnect the autopilot, fly the plane to where you want it - smoothly, then re-connect the autopilot and continue the approach as long as you are out far enough to do it safely and not rush.

The computer needs a bit of time to track the LOC and G/S so it can compute the wind etc. Remember in an auto land, the 3 FCC's need to talk to each other and agree, so as to complete the full 3 autopilot landing - all that takes a bit of time. Also, the tracking is important so the computers figure the drift for the input to the rudder. A lot goes on when the other two autopilots are engaged.

A good landing begins with a stable approach.

Lou
  

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Autopilot not working
Reply #238 - Jul 17th, 2011 at 6:26pm
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Even though the buttons light up when I click them, none of the autopilot functions are working. I checked the electronics systems, and they are on, so the autopilot should be functioning. Any suggestions?

Thanks,
boeing247
  

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Re: Autopilot not working
Reply #239 - Jul 17th, 2011 at 6:45pm
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Check INS
Reinstall FSUIPC

those are my only suggestions when it comes to a faulty autopilot
  
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