billhuntersemail(at)gmail
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 Posted: Tue Mar 02, 2021 3:53 pm Post subject: URGENT REQUEST Transponder Test Failed...Troubleshooting Sug |
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The static test technician is coming back to the airpark tomorrow so can
someone PLEASE help me troubleshoot a failed test transponder? I also
posted this same request on the Dynon forum hoping to get a troubleshooting
answer tonight.
I tried to get a pitot static test today and the system failed the
transponder Mode S interrogations received component of the test. He was
using the Tol-Instruments T-48 MODE S/ATCRBS TRANSPONDER RAMP TEST SET. He
said that the test set was receiving between 65 to 100 percent of the
interrogations and the device reports the lowest number as the result and
anything less than 90 percent is considered a fail so my system got a 65
percent.
After the fail I switched the antenna from the transponder to the ADS-B
antenna and the result was the same so it seems that the antenna was not at
fault.
The technician had me switch it to Mode A and he used a different test kit
called a AV-17 AVIONICS TESTER and the mode A and Mode C system worked great
with 100 percent replies received however when he uses the T-48 MODE S
tester the same problem.
The transponder is the Dynon -261 unit.
The setup shows the following:
ON-LINE HW22.03 FW01.02 SW02.11
USA 91.227 COMPLIANT NO
GPS DATA (OFFLINE) GARMIN ADS-B/ADS-B+
PRESSURE ALTITUDE OK SKYVIEW
TAIL NUMBER shows my N-Number
TRANSPONDER HEX CODE A0088C
ADS-B IN FREQ (BOTH SV-ADSB-472)
TIS TRAFFIC is ON
What troubleshooting steps should I take now? How do I determine if it is a
programming issue or cable or the unit???
He is coming back to the airport tomorrow so if it is something that I can
reprogram of fix please let me know.
THANKS
Bill
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