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  #1  
Old 05-31-2021, 04:03 PM
dougweil's Avatar
dougweil dougweil is offline
 
Join Date: Jun 2005
Location: Hudson, WI
Posts: 252
Default AFS 4500 “No GPS”

Hey gang,

My RV-7 has an AFS 4500/3500 setup being driven by a 430W (via ARINC). Yesterday for the 4th time in the past 9 years of flying I was cruising along and got a “NO GPS” warning flag on both screens. This freezes the map position display and I have to resort to the small map display on the 430W (no flight director or CDI). The only solution seems to be powering off the AFS boxes (requiring turning off the master switch since they are directly wired to ships power) and do a reboot and all is well. Years ago Rob Hickman told me this is caused by a possible very short interruption in the RS-232 signal from the 430W. Anyone else ever seen this? I can’t seem to duplicate it and since it only happens once every couple years it’s hard to track down!!
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Doug Weiler

Hudson, WI
president, Twin Cities RV Builders Group
RV-4, sold
RV-7 completed and flying N722DW, 930 hours
Based Lake Elmo, MN (21D)
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  #2  
Old 06-01-2021, 04:17 AM
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rleffler rleffler is offline
 
Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,252
Default

Did you check the notams to see if there was any military gps jamming going on where you were flying?
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N410BL - RV10 Flying
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  #3  
Old 06-01-2021, 05:45 AM
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MacCool MacCool is offline
 
Join Date: Aug 2020
Location: central Minnesota
Posts: 648
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I had that problem. I thought it was probably my ARINC module but turned out to be a bad pin insertion on the 430W side after installing ADS-B.

Rob, or Shawn, or Jonathon at Advanced Flight are pretty responsive when you call them on the phone. I'd start there (and I have). The AFS Forums are also a good place to get input from those guys.
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RV-9A, 2011, bought flying
IO-320D1A
IFR certified
AFS 5400/3500, G5, 430W, some other stuff
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  #4  
Old 06-01-2021, 10:43 AM
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dougweil dougweil is offline
 
Join Date: Jun 2005
Location: Hudson, WI
Posts: 252
Default

Thanks for the insight. GPS signals were all strong on the 430 and Freeflight ADSB. I’ll do a little connector inspection and then talk to AFS.
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Doug Weiler

Hudson, WI
president, Twin Cities RV Builders Group
RV-4, sold
RV-7 completed and flying N722DW, 930 hours
Based Lake Elmo, MN (21D)
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  #5  
Old 06-01-2021, 11:28 AM
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gmkonrad gmkonrad is offline
 
Join Date: Feb 2005
Location: Howell,MI
Posts: 149
Default No gps

You may want to try a serial port loop back test, for the port assigned to the gps, in your 4500.

Gary
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RV-7 FLYING
N319GK
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  #6  
Old 06-01-2021, 06:22 PM
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MacCool MacCool is offline
 
Join Date: Aug 2020
Location: central Minnesota
Posts: 648
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Doug, if you haven't already, you might look at page 110 of the AFS 4500 installation manual and see if there's any information there helpful to your situation. It deals with troubleshooting the EFIS-ARINC-430W connections.

https://www.advancedflightsystems.co...ual%20V7.4.pdf
__________________
RV-9A, 2011, bought flying
IO-320D1A
IFR certified
AFS 5400/3500, G5, 430W, some other stuff

Last edited by MacCool : 06-02-2021 at 05:15 AM.
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