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AFS / VP-X / Fast Stack Based Panel
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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Mon Dec 12, 2011 12:03 pm Post subject: Re: AFS / VP-X / Fast Stack Based Panel

Andrew,



At the risk of being redundant, let me summarize. I am most familiar with the Trio Pro since that's what I have, but I think the TT models function similarly.



1. If you have nothing but the autopilot - absolutely nothing else - then these autopilots will attempt to hold the wings level but there may be a slow drift in course, left or right. They won't really hold a course. The autopilot will hold a commanded altitude; or, it will climb or descend at a commanded rate to a designated altitude.



2. If you have a serial gps input to the autopilot (this can even be from most battery operated handheld units), then the autopilot will hold a course (ground track). It will also track the course entered into the gps. So you can do a GPS LNAV approach by letting the autopilot track the course, while you manually enter the desired altitude(s) to descend to, at the appropriate time(s).



3. If you have a WASS capable gps feeding the autopilot via an ARINC line, then these autopilots will do a full GPS LPV approach on their own (you have to order the GPSS/GPSV options for the autopilot).



4. If you feed the autopilot (which again has to have the GPSS/GPSV options) from a compatible EFIS then it can do an ILS.

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Bob Turner
RV-10 QB

along(at)aanet.com.au
Guest

Posted: Mon Dec 12, 2011 1:36 pm Post subject: AFS / VP-X / Fast Stack Based Panel

Great summary thanks. I was just getting it, however, your explanation made it clear.Thanks. [quote][b]

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Jim Combs

Joined: 24 Jan 2010
Posts: 141
Location: Lexington, Ky

Posted: Mon Dec 12, 2011 5:15 pm Post subject: AFS / VP-X / Fast Stack Based Panel

No I misread your note looks like we are both flying the AFS (TT) AP.  It works great stand alone or coupled to the EFIS unit (Via the ARINC)



On Sun, Dec 11, 2011 at 10:20 PM, Les Kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:

 [quote]Hi Jim

My A/P is a TruTrak branded with the AFS logo. Is that different from yours. 

 



Cheers

Les 



Sent from my iPhone



On 2011-12-11, at 8:06 PM, Jim Combs <jiminlexky(at)gmail.com (jiminlexky(at)gmail.com)> wrote:

 

 	  Quote: 	
		  I am flying the same configuration as Les except I have the AFS AP (TT with different software).  The Static and Pitot are plumbed into both EFIS units and the AP.  GPS receivers are also wired into both EFIS units and the AP as well.  

  

Holding the AP Engage button on the stick for 3 seconds gets you into AP stand alone mode (heading and alt hold).  Pressing the EFIS button on the AP couples the EFIS and AP together to allow the Flight Director in the EFIS to command the AP.  Works very well.

  

Jim C

N312F 300+ hours

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[b]

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RV-10 -> N312F - Flying as of 12/2008

msausen

Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA

Posted: Tue Dec 13, 2011 7:17 am Post subject: AFS / VP-X / Fast Stack Based Panel

Jim, 

  

 If you put in a selector switch you can switch the ARINC to a second source such as a 430 or 650 and it will take GPSS/GPSV commands like the regular TT DII  VSGV independent of the AFS EFIS.  The fuses you are referring to a very handy and can be found in pretty much any auto parts store now. 

  

Michael 

  

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Jim Combs

 Sent: Monday, December 12, 2011 7:28 PM

 To: rv10-list(at)matronics.com

 Subject: Re: AFS / VP-X / Fast Stack Based Panel 

  

No stand alone ILS/GPS approach capability for the AP.  If you get into that mode you have to fly the approach yourself.  But having the AP fly the airplane in case the EFIS units go south, is a benefit all  by itself.  The GPS is providing the AP with heading, and airspeed information (and maybe altitude?).  Not sure if it is using the static port for altitude or the data from the GPS.  The AP will not allow a climb to go below a min airspeed nor will it allow  a descent to go above a max airspeed. Min and max airspeed override a commanded climb or descent rate.  These are programmable via the AP setup (and via the AFS EFIS too).

 

 So that is one reason I have a second $40 GPS receiver driving the AP and co-pilot EFIS while the GNS430W GPS drives the pilot side EFIS.  I can keep power to the secondary GPS and the AP in the case of a power issue.  I am in the process of adding additional  fuses for power.  I had both EFIS units on a single fuse (What the heck was I thinking?) and that caused an issue on a flight.  One of the other pilots found a supply of fuses with a internal LED that glows when it blows.  Makes identification much easier.

 

 Jim C

 

   

On Sun, Dec 11, 2011 at 11:07 PM, Andrew Long <along(at)aanet.com.au (along(at)aanet.com.au)> wrote: 

Hi Jim,

 

 Does that AP have ILS/GPS RNAV approach capability (i.e. with it navigate alt as well as heading?)

 

 My want.... is basically to have a 3-axis AP that can be managed independant of the EFIS should it fail (shounds like this does) and can be coupled to a ILS/GPS RNAV approach. Does this fit the bill? Sounds like it does, just clarifying.....   

 

 Regards, 

 Andrew Long 

 www.ozrv10.com  

 

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