AN ATX FIXED WING LTT WAS OPERATED AND EXCEEDED THE ROUTINE 100 HR INSPECTION PERIOD.

Narrative

ON THE MORNING OF DEC/TUE/97; DURING A ROUTINE PREFLT INSPECTION; I CHKED THE MAINT SUMMARY SHEET IN THE ACFT TO SEE IF ANY ITEMS WOULD COME DUE DURING OUR 6 DAY TOUR OF DUTY. I NOTED THAT THE NEXT INSPECTION WAS DUE AT 1926.6 HRS AND THAT THE CURRENT ACFT TIME WAS RECORDED AS 1826.6. THE MAINT SUMMARY WAS DATED DEC/XX/97; LEADING ME TO BELIEVE THAT 100 HRS REMAINED BEFORE THE NEXT INSPECTION. THE FLT WAS DELAYED APPROX 3 HRS DUE TO FROST ON THE ACFT SO THAT BY THE TIME WE ACTUALLY GOT INTO THE COCKPIT; WHERE THE HOBBS METER IS LOCATED; THE SPECIFIC NUMBERS HAD BEEN FORGOTTEN; LEAVING ONLY THE BELIEF THAT 100 HRS REMAINED BEFORE INSPECTION; MUCH MORE THAN I COULD REASONABLY EXPECT TO FLY IN A 6 DAY PERIOD. BECAUSE THE BEGINNING OF OUR TOUR OCCURRED DURING A WEEKEND; NO ONE WAS IN THE OFFICE TO REVIEW THE FLT TIMES WHEN THEY WERE FAXED IN; AS COMPANY POLICY CALLS FOR. IN ADDITION; WE DID NOT FLY ON MONDAY SO THEREFORE DID NOT FAX OUR TIMES IN; AS THEY HAD NOT CHANGED; THIS FURTHER LIMITED THE CHANCE THAT SOMEONE IN THE OFFICE WOULD CATCH THE ERROR. TUESDAY; WE HAD A PROB WITH THE APU AND CALLED THE DIRECTOR OF MAINT FOR AN MEL DEFERRAL. PER COMPANY POLICY THE ACFT TIME AT THE TIME OF OCCURRENCE WAS RPTED; THE MEL PAPERWORK WAS COMPLETED AND WE DEPARTED ON A REPOSITIONING FLT. AS WE TAXIED IN AT THE DEST; I RECEIVED AN URGENT PAGE TO CALL THE DIRECTOR OF MAINT. AT THIS POINT WE WERE INFORMED THAT THE INSPECTION INTERVAL HAD BEEN EXCEEDED.