A BEECH C90B HAD A PHASE CHK AND 'ALTIMETER; AIRSPD; TRANSPONDER' REQUIRED TEST EXCEED TIME LIMITS.

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FROM WORKING WITH MY OWN PLANES; WITH MANUFACTURER'S MAINT PROGRAMS AND WITH VARIOUS MAINT FACILITIES; I AM FAMILIAR WITH TRACKING; ANTICIPATING AND PREPARING FOR MAINT EVENTS WHICH OCCUR AT VARYING SCHEDULES; WHETHER BY CALENDAR DATE; FLT TIME; OR OPERATING CYCLES; AND SOMETIMES IN COMBINATIONS. WHILE MAINTAINING THE 'A' MODEL KING AIR AT COMPANY ABC; MR X PRESENTED A FORECAST OF THE NEXT REQUIRED ITEMS WHENEVER THE PLANE LEFT HIS FACILITY; AND WOULD CALL BTWN EVENTS TO VERIFY COMPLIANCE. WHEN MY COMPANY ACQUIRED THE 'B;' THE CONSENSUS WAS TO USE A BEECH SVC CTR FOR WARRANTY PURPOSES; WHICH WORKED WELL FOR A NUMBER OF ITEMS. MAINT FORECASTING WAS COORD WITH THE SPECIALISTS THERE AND AN UPDATED PHOTOCOPY JOURNAL OF ALL MAINT LOG ENTRIES WAS KEPT AT THAT FACILITY. TO KEEP A LCL TECHNICIAN INVOLVED WITH THE PLANE FOR SHORT NOTICE QUICK FIX HELP IF NEEDED; I HAVE HIM DO AS MUCH LIGHT MAINT AS PRACTICAL AT OUR HANGAR. HE HAD TAKEN DELIVERY OF NEW TIRES AND BRAKES AND WE HAD A FREE DAY TO INSTALL THEM. WHILE DOING SO; I REVIEWED SOME ITEMS IN THE MAINT LOGS AND NOTICED THAT I HAD NOT UPDATED AN ENTRY ON MY OUTLOOK SCHEDULE AND FOUND THE LOGBOOK ENTRY TO UPDATE IT. THIS WAS FOR THE ALTIMETER/AIRSPD/TRANSPONDER 2-YR TEST. THE ALTIMETER HAD BEEN SENT TO AN INST SHOP AND; WHEN REINSTALLED; THE LOG ENTRY SHOWED IT WAS ONLY CHKED; NOT FULLY TESTED. BUT I HAD OUR LCL TECHNICIAN LOOK AT IT ANYWAY; AND HE SAID THE TEST WAS NOT COMPLETE. SO I CALLED THE SVC CTR AND THEY SAID THE SAME THING AND ARRANGED TO GET IT DONE THE NEXT DAY. I WOULD BE ABLE TO DO A TRIP THAT EVENING BUT WOULD HAVE TO STAY OUT OF SOME HIGH TFC AIRSPACES AND CANCEL A TRIP THE NEXT DAY. THEN ABOUT 1 HR LATER; THE SVC CTR CALLED AGAIN AND SAID THE PLANE WAS OUT OF THE '4 PHASE EVERY 2 YR' REQUIREMENT. SINCE COMPANY ABC HAD KEPT ME COMPLETELY UPDATED IN THE PAST; AND; MORE RECENTLY; THE 2-YR INSPECTION REQUIREMENT HAD BEEN A NON ISSUE; I HAD NOT ENTERED IT AS A CHKLIST ITEM ON MY OUTLOOK SCHEDULE; AND MISSED IT.