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#1
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Autocontrol IIIB
I have the original Autocontrol IIIB in my 79 Archer. Lately it has been flying one dot to the right of course when in GPS/NAV mode. I've set the CDI scale to 1.0nm full scale on the GPS so the error is only about 0.2 nm. If I set the heading but to the right a little, we fly right down the line. This says to me that the autopilot is putting out a small bias to the left that the GPS/NAV has to constantly correct. Is there a simple adjustment in the autopilot to correct this? Maybe I should just vent to the newsgroup and leave good enough alone! Chuck |
#2
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In article ,
PaulaJay1 wrote: I have the original Autocontrol IIIB in my 79 Archer. Lately it has been flying one dot to the right of course when in GPS/NAV mode. Wild guess: Is your rudder trim set right? -- Ben Jackson http://www.ben.com/ |
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#6
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In article , "James M. Knox"
writes: The only IIIB adjustment for "centering" is probably not relevant. Set the IIIB in HDG mode (no NAV tracking). Does it track with the DG heading bug under the lubber line? If so, it's adjusted properly. Interesting. I've not looked at the heading bug tracking that closely. I'll look next time and see if the heading but is on the lubber line or off to the right a little. Chuck |
#7
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In article , "James M. Knox"
writes: . Maybe I should just vent to the newsgroup and leave good enough alone! That's all it's off! Heck, you may have one of the best units out there! G Like I said, "Maybe I should leave good enough alone." :-) |
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#9
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Are you in GPS or NAV mode?
GPS - the CDI would be reading the GPS course NAV - it would be reading what you had your OBS set to and your NAV receiver set to the freq of the navaid what GPS/ NAV do you have, the garmin 430 and the NAV that you can get with it? I know that when I am having my auto pilot track a VOR it may be off by a dot sometimes, this is basically because the VOR is not that sensitive when your a ways from it. But when I shoot a localizer, the AP tracks it perfect. Have you tried tracking a localizer with your AP ? Jeff PaulaJay1 wrote: I have the original Autocontrol IIIB in my 79 Archer. Lately it has been flying one dot to the right of course when in GPS/NAV mode. I've set the CDI scale to 1.0nm full scale on the GPS so the error is only about 0.2 nm. If I set the heading but to the right a little, we fly right down the line. This says to me that the autopilot is putting out a small bias to the left that the GPS/NAV has to constantly correct. Is there a simple adjustment in the autopilot to correct this? Maybe I should just vent to the newsgroup and leave good enough alone! Chuck |
#10
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In article , Jeff writes:
Are you in GPS or NAV mode? GPS - the CDI would be reading the GPS course NAV - it would be reading what you had your OBS set to and your NAV receiver set to the freq of the navaid what GPS/ NAV do you have, the garmin 430 and the NAV that you can get with it? I know that when I am having my auto pilot track a VOR it may be off by a dot sometimes, this is basically because the VOR is not that sensitive when your a ways from it. But when I shoot a localizer, the AP tracks it perfect. Have you tried tracking a localizer with your AP ? When I am flying a GPS course (with the garmin 430) straight and narrow, the CDI is constantly about one dot to the left. Same for an ILS, though the Garmin goes into approach mode and the full scale CDI is 0.2 nm. Thus the "error" is only a couple hundred feet. I generally fly the last part of the approach so, no problem at all. I've decided to take the advice of several and leave it alone and say that it is the nature of the beast. Thanks to all for the comments. Chuck |
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