Transponder Failure Indications
I've had recently on a few occasions pilots reporting that their Transponder is showing a 'failure' indication, but from radar all is showing fine. The aircraft concerned are all B737-300/700's, is this a common fault or am I unlucky enough to have just had all the freak shows recently? Possibly unlinked but one then declared about 5 minutes later that TCAS had failed too! Just a bad day there hopefully!