A CESSNA 500 CREW; ON FIRST FLT OUT OF MAINT; EXPERIENCED NUMEROUS MAINT DISCREPANCIES. RADAR INSTALLATION PREVENTED RETRACTION OF LNDG GEAR; SQUELCH SWITCH WAS DEACTIVATED; AND THE FO'S MIC SWITCH WAS STUCK.

Narrative

ACFT WAS RETURNED TO SVC AFTER WORK ON THE RADAR; GPS; AND AVIONICS. THE RADAR WAS IMPROPERLY RE-INSTALLED AND BLOCKED THE LNDG GEAR SWITCH. THE SQUELCH SWITCH ON COMM 1 WAS ALSO INACTIVATED. ON DEP; THE GEAR DID NOT RETRACT; AND STATIC FROM THE RADIO WAS EXTREMELY DISTRACTING. IN ADDITION; THE CO-PLT'S MIC WAS STUCK; AND WE INADVERTENTLY TRANSMITTED ON APCH AND CTR FREQS AS WELL AS MISSING SOME CALLS. WHILE WE WERE TROUBLESHOOTING THE LNDG GEAR AND RADIO; I'M CERTAIN THAT WE CONTRIBUTED TO CONFUSION WITH ATC. WE SHOULD HAVE TAKEN THE ACFT UP FOR A 'SHAKEDOWN' FLT AFTER MAINT; BEFORE DEPARTING ON OUR TRIP. ALSO; WE SHOULD HAVE RETURNED TO ZZZ TO RESOLVE THE PROB INSTEAD OF CONTINUING THE FLT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE SHOULD HAVE BEEN TEST FLOWN INSTEAD OF LEAVING IMMEDIATELY ON A TRIP; BUT BEING IN A HURRY; THEY DEPARTED. THE RPTR STATED SOME OF THE DISCREPANCIES COULD HAVE BEEN CORRECTED INFLT; BUT THE RADAR SCOPE INTERFERENCE WITH THE LNDG GEAR SWITCH NEEDED CORRECTION AT A GND MAINT STATION. RPTR INDICATED THE AIRPLANE WAS NOT RETURNED TO THE REPAIR FACILITY THAT PERFORMED THE INITIAL INSTALLATIONS; BUT WAS DIVERTED TO ANOTHER REPAIR FACILITY FOR CORRECTION. THE RPTR STATED THE ONLY GOOD DECISION THAT WAS MADE THIS DAY WAS NOT TO RETURN TO THE PEOPLE THAT INSTALLED THE RADAR; GPS; AND AVIONICS. THE RPTR SAID THERE COULD NOT HAVE BEEN A FINAL INSPECTION AFTER ANY ITEM WAS INSTALLED OR REPAIRED.