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Fully automated flight---LNAV to ILS? (Read 4732 times)
David Paul
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Fully automated flight---LNAV to ILS?
Jan 15th, 2014 at 8:31pm
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Hi.

I am trying to see if you can do a fully automated flight, from just after takeoff to full ILS autoland under LNAV.   I just tried it into KSTL, and I was almost to the point of ILS capture and the plane decided to turn away from the airport about 15 or 20 miles away.   Normally I would fly with the FSX ATC and would be getting vectored to the ILS capture leg, but I wanted to see if LNAV could do everything on it's own, including the ILS landing. 

I figured I would have to lower the gear, set flaps, autobrakes, spoilers armed, etc.  But we turned away just when I thought I was onto something!

So what's the deal?  Is the plane supposed to be able to go all the way to the runway under LNAV?
  


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Markoz
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Re: Fully automated flight---LNAV to ILS?
Reply #1 - Jan 16th, 2014 at 5:05am
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David Paul wrote on Jan 15th, 2014 at 8:31pm:
Hi.

I am trying to see if you can do a fully automated flight, from just after takeoff to full ILS autoland under LNAV.   I just tried it into KSTL, and I was almost to the point of ILS capture and the plane decided to turn away from the airport about 15 or 20 miles away.   Normally I would fly with the FSX ATC and would be getting vectored to the ILS capture leg, but I wanted to see if LNAV could do everything on it's own, including the ILS landing. 

I figured I would have to lower the gear, set flaps, autobrakes, spoilers armed, etc.  But we turned away just when I thought I was onto something!

So what's the deal?  Is the plane supposed to be able to go all the way to the runway under LNAV?
Which model and what route?
  

Mark Fletcher



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David Paul
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Re: Fully automated flight---LNAV to ILS?
Reply #2 - Jan 16th, 2014 at 10:01am
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Hi Mark!

I am flying the 777-200ER from KORD to KSTL.  The Route I am using is KORD-BOJAK-NEWTT  then the VLA7 STAR using the RBS transition to ILS RWY 30R.

Everything does what is supposed to do until just after it makes the turn to final.  It flies straight for a couple of minutes, then turns to the right and heads for waypoint TOY, then just flies in that direction until I intervene.
  


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Markoz
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Re: Fully automated flight---LNAV to ILS?
Reply #3 - Jan 16th, 2014 at 11:47am
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I tested this out and selected the Approach Transition of TRYSH (ILS30R.TRYSH). After TOY, I had VECTORS (track 186o) in my route. What happens when you reach VECTORS, is that the 777 will follow the VECTORS track, 186o in this case.

http://i669.photobucket.com/albums/vv58/Markoz958/vectors_zpsf48a2fde.jpg~origin...
This is the route with VECTORS. Notice the magenta line heading away from TOY, but not towards TYRSH.

When you have VECTORS in the route and you are not using the ATC, then you need to either use Heading Select to steer towards TYRSH, select TYRSH (copy it to the scratchpad), then "paste" it over VECTORS to remove VECTORS from the route, and head straight in to land.

Or, select TRYSH (copy it to the scratchpad), then "paste" it over VECTORS, and that means that you will go straight from TOY to TYRSH, which is the sensible thing to do. Upon reaching TYRSH, you would then turn towards waypoint HIXOM (302o), and you should then bE able to capture the ILS/GS and do a full AUTOLAND.

http://i669.photobucket.com/albums/vv58/Markoz958/novectors_zpsc38ac2a0.jpg~orig...
This is the route after VECTORS was replaced with TYRSH. Notice the magenta line goes directly from TOY towards TYRSH.
  

Mark Fletcher



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David Paul
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Re: Fully automated flight---LNAV to ILS?
Reply #4 - Jan 16th, 2014 at 5:47pm
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I am not getting that VECTORS entry at all.  My plan looks just like yours after you got get of VECTORS.  I made the turn to TRYSH ok, everything was looking good, then for no apparent reason, the plane turned to the right about 90 degrees and headed for TOY. 

To be clear -- am I supposed to leave it in LNAV mode all the way to the ground, or should I be switching to APP mode at some point? 

I just tried a different plan, going from KORD to KCMI with the ILS 32R VEALS transition.  It turned towards VEALS on final and started to descend from 2600, but it never managed to get to VEALS and lined up for the landing.  It crashed in a field about a mile from the runway.

SO am I doing it wrong by leaving it in LNAV the whole way?  This is an important point.
  


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Markoz
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Re: Fully automated flight---LNAV to ILS?
Reply #5 - Jan 16th, 2014 at 9:14pm
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Once the ILS and the Glide Slope are alive, and you are turning/have turned towards the runway, turn LOC Switch ON. If the the GS is just above the centre line, you can skip the LOC and just go straight to APP. Without APP, you will not be able to AUTOLAND (LAND3)! And don't forget to set the VREF speed in the APPROACH page on the CDU!
  

Mark Fletcher



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David Paul
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Re: Fully automated flight---LNAV to ILS?
Reply #6 - Jan 16th, 2014 at 9:30pm
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OK thanks, Mark.  I wasn't sure if you were supposed to stay on LNAV all the way to the runway, or switch to LOC/APP once you are set up to capture the localizer.

I wasn't switching to LOC/APP.  I thought LNAV would do the ILS approach and landing.  I think it will work properly now that I know to switch to LOC or APP.

I generally won't be flying this way, as I prefer to do my descent and approach without VNAV/LNAV, being vectored by ATC is the way I normally do it.  But since I have this 777 "Flying Computer", I wanted to see it do a fully automated descent and landing at least a time or two just for kicks!

  


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