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05-01-2012, 05:29 PM
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Join Date: Oct 2007
Location: Macon, GA
Posts: 498
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Intermittent transponder/Mode C issue....
My transponder and/or encoder are intermittently acting up. Atlanta approach thought I'd busted their bravo today by being at 10.5k when I was really at 3.5k (WELL under the 8k shelf). By the time I got back in Macon, it was fine (ATL had called MCN to get them to ask my altitude, then I got the dreaded "say when ready to copy a number").
I assume the encoder is likely the issue, but I don't really know much about how the two parts work (other than their basic function).
I assume the encoder is probably the issue, and will check that there's no water trapped in the lines tomorrow to make sure, but I doubt it'd migrate all the way past all the Tees to just affect the encoder...
Any suggestions?
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Macon, GA (KMCN)
RV-7, Niner Fife Victor
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05-01-2012, 06:00 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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You should have it checked by an avionics shop, it could be the encoder, wiring or transponder.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 05-01-2012 at 07:22 PM.
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05-01-2012, 06:24 PM
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Join Date: Oct 2007
Location: Macon, GA
Posts: 498
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Walt,
Check your PM's.
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Macon, GA (KMCN)
RV-7, Niner Fife Victor
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05-01-2012, 06:29 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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What brand?
Chuck,
What transponder do you have? I had a KT-76A with the same problem. It would intermittently drop out. The instrument shop said there were some internal plug-in connections that were dirty that they cleaned with a pencil eraser. Seems to have solved the problem for a few months before I sold my airplane. I get the sense from the avionics shop that this was a known problem with those transponders. Serious PITA...
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05-01-2012, 06:41 PM
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Join Date: Oct 2007
Location: Macon, GA
Posts: 498
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Quote:
Originally Posted by Av8torTom
Chuck,
What transponder do you have? I had a KT-76A with the same problem. It would intermittently drop out. The instrument shop said there were some internal plug-in connections that were dirty that they cleaned with a pencil eraser. Seems to have solved the problem for a few months before I sold my airplane. I get the sense from the avionics shop that this was a known problem with those transponders. Serious PITA...
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It's a Narco AT50A. The KT-76A in my Stinson works perfectly.
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Macon, GA (KMCN)
RV-7, Niner Fife Victor
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05-02-2012, 08:36 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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I had something similar happen with a Narco AT150TSO with an AR850 encoder. Sometimes it would be right on, other times it would be WAY off. The cable between the two units had come slightly loose at one end, and one bit of the altitude code wasn't getting transmitted to the transponder. It was a very cheap fix, but with a letter from the feds, I still had to pay to have it recertified.
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
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1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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