A B737-500 MAINT CONTROLLER DEFERS THE WEATHER RADAR STUCK IN TEST MODE; PREDICTIVE WINDSHEAR INOP; GPWS INOP AND THE TERRAIN OVERRIDE INOP LIGHT WAS ILLUMINATED. DOWNLINE CAPTAIN QUESTIONS MEL PROCEDURES USED.

Narrative

CAPT OF ACFT X CALLED FROM THE GATE AT ZZZ1 AMD RPTED THE WX RADAR WAS STUCK IN THE TEST MODE. I HAD HIM CYCLE THE WX RAD R UNIT CIRCUIT BREAKER; BUT NO HELP. HE ALSO SAID PREDICTIVE WINDSHEAR WAS INOP; GPWS WAS INOP AND THE TERRAIN OVERRIDE INOP LIGHT WAS ILLUMINATED. SO I MADE 3 LOG ITEMS AND DEFERRED THEM USING WHAT I FELT AT THE TIME WAS THE CORRECT MEL'S. WHEN THE ACFT ARRIVED IN ZZZ2; THE NEW CAPT ASKED SOME QUESTIONS TO THE CTLR THAT WAS ON. HE THEN NOTIFIED ME THAT THERE MIGHT BE SOME ERRORS IN WHAT I DID. SO I TOOK A SECOND LOOK AT THE APPROPRIATENESS OF THOSE MEL'S. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED MUCH DISCUSSION FOLLOWED BETWEEN HIMSELF; THE OTHER MAINT CONTROLLER AND THE DOWNLINE CAPTAIN AS TO THE APPROPRIATENESS OF THE MEL DEFERRALS REPORTER HAD MADE EARLIER. REPORTER STATED ALL THE LOG ITEMS WERE DEFERRABLE; BUT THE LACK OF KNOWLEDGE OF WHAT REALLY DRIVES PREDICTIVE WINDSHEAR AND THE INTERRELATIONSHIP OF GPWS; TERRAIN OVERRIDE AND WEATHER RADAR; MADE ALL OF THEM REALIZE THE DIFFICULTY IN USING THE PROPER MEL DEFERRAL PROCEDURES. AS A RESULT; REPORTER STATED HE REALIZED HE DID NOT APPLY THE CORRECT MEL PROCEDURES TO THE DEFERRALS AND MAINT RELEASE; AND CORRECTED THE MEL REFERENCE FOR THE LOG ITEMS HE HAD DEFERRED EARLIER.