PLT SCHOOL ACFT WENT OVER THE 100 HR INSPECTION REQUIREMENT DUE TO THE INACCURACY OF THE SCHOOL'S ACFT INSPECTION STATUS BOARD AND THE ACTUAL LOGBOOK RECORDS.

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I WAS INSTRUCTING 2 MIL OFFICERS IN A FLT SCREENING PROGRAM. BECAUSE THESE 2 INDIVIDUALS WERE UNDER A TIME CONSTRAINT TO FINISH THEIR PROGRAM; I WAS FLYING 6-7 HRS/DAY. I SCHEDULED US TO FLY AN AIRPLANE WHICH I THOUGHT HAD 60 HRS LEFT BEFORE IT WAS DUE FOR A 100 HR INSPECTION. I MADE THIS DETERMINATION BY CHKING A MAINT STATUS SHEET THE SCHOOL OPERATOR KEPT WITH THE AIRPLANE. ON DEC/SUN/01; I FLEW THE FINAL XCOUNTRY FLT WITH ONE OF MY STUDENTS. WHEN WE ARRIVED BACK AT THE SCHOOL; THE AIRPLANE SHOULD HAVE HAD 46.5 HRS BEFORE THE 100 HR INSPECTION WAS DUE. WHEN I CAME TO WORK ON DEC/THU/01; I NOTED THAT THE AIRPLANE HAD A 100 HR INSPECTION COMPLETED ON DEC/WED/01. CONFUSED ABOUT THIS; I CHKED THE MAINT STATUS BOARD AND REALIZED THE AIRPLANE WAS OVERFLOWN BY 3.5 HRS. I CHKED THE ACFT LOGBOOKS TO VERIFY THE ACCURACY OF THE STATUS BOARD AND REALIZED THAT THE STATUS BOARD WAS ALSO WRONG -- THE AIRPLANE OVERFLEW THE 100 HRS BY 5.5 HRS! I DISCUSSED THE ISSUE WITH THE SCHOOL OPERATOR AND OUR MAINT PEOPLE. AS AN ADDITIONAL FOLLOW-UP; I REVIEWED THE STATUS SHEETS IN THE REMAINDER OF THE SCHOOL'S AIRPLANES AND FOUND ANOTHER AIRPLANE IN WHICH THE STATUS SHEET INCORRECTLY SHOWED WHEN AN INSPECTION WAS DUE.