SDR BKEA20150819

Service difficulty report · Transponder · Gulstm 200

Difficulty date: August 19, 2015
Submitted: August 19, 2015
Operation: General aviation
Aircraft: N236LC
Make and model: Gulstm 200
Aircraft serial: 154
Aircraft time: 2,931 hours, 1,430 cycles
System (JASC): 3452 · ATC Transponder System
Part: Transponder
Condition: Malfunctioned
Stage of operation: TO
How discovered: O
Nature of condition: J
Precautionary procedure: C

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

JUST AFTER TAKEOFF WE RECEIVED "RT T/R INOPERATIVE" CASS MESSAGE AND ATC REPORTED THAT THEY DIDN'T HAVE OUR TRANSPONDER. WE CYCLED THROUGH OUR TRANSPONDER OPTIONS AS ATC CONTINUOUSLY ASKED WHERE AND AT WHAT ALTITUDE WE WERE. DURING THE 31 MINUTE FLIGHT WE INTERMITTENTLY SAW "LT T/R INOP" AND "SB INHIBIT". THE TRANSPONDERS ISSUES COULD NOT BE FIXED BY US WE ELECTED TO RETURN TO DEPARTURE AIRPORT.