A TFC WATCH PLT FOUND THAT HIS ACFT WAS OVERDUE FOR AN ANNUAL INSPECTION.

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I AM ONE OF THE PLTS THAT FLIES TFC WATCH ACFT IN THE AUSTIN; TX; AREA. THE ACFT WE USE ARE EITHER PVT OR FLT SCHOOL ACFT; MODEL 172N SKYHAWKS. IN ALL PURPOSES; ALL RELEVANT INFO REGARDING ACFT STATUS IS MADE AVAILABLE TO US PLTS. AS OF MAY/TUE/95 IT CAME TO MY ATTN THAT ONE OF THE ACFT WE WERE FLYING WAS NOT BEING MAINTAINED PROPERLY. AFTER REVIEW OF MAINT LOGBOOKS; WHICH WE WERE NOT INFORMED WERE IN THE ACFT; IT WAS ESTABLISHED THAT THE ANNUAL INSPECTION HAD NOT BEEN PROPERLY CONDUCTED AND THAT THE 100 HR INSPECTION HAD NOT BEEN COMPLETED. I FLY THE MORNING PORTION OF TFC WATCH ON 2 DAYS. THESE FLTS BEGIN AT XA30 AM; AND IT IS UNFEASIBLE TO CONTACT THE MAINT PERSONNEL IN HOUSTON FROM AUSTIN THAT EARLY IN THE MORNING; AND TO PERSONS I HAVE NO KNOWLEDGE OF. THESE INSPECTIONS ARE REQUIRED UNDER PART 91;409. NO SPECIAL OPERATING PERMIT IS KNOWN TO EXIST FOR THIS ACFT; SO SECTIONS A AND B APPLY HERE. ACCORDING TO RPTS; THE ANNUAL WAS OVERFLOWN BY 2 CALENDAR MONTHS; AND THE 100 HR INSPECTION BY NO LESS THAN 20 HRS. I REALIZE THAT IT IS UP TO THE PIC TO DETERMINE THE SAFETY OF THE FLT. BUT IT IS ALSO THE RESPONSIBILITY OF THE OWNER/OPERATOR TO ENSURE THAT PROPER MAINT HAS BEEN COMPLETED. SINCE KNOWLEDGE OF THIS; NONE OF THE PLTS; INCLUDING MYSELF; HAVE FLOWN THE AIRPLANE NOR WILL WE; UNTIL CORRECTIVE CHANGES ARE MADE AND THAT ALL INSPECTIONS ARE COMPLIED WITH.