A PIPER 34 OWNER RPTED THE BIANNUAL ALTIMETER AND XPONDER CHK WAS NOT ACCOMPLISHED AND OUT OF DATE.

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I HAVE DISCOVERED THAT MY AIRLINE IS IN VIOLATION OF PART 91.411/413 -- THE ALTIMETER AND XPONDER TESTS. THE FAA IS INVESTIGATING AND WANTS TO SEE MY MAINT LOGS. THE PROB ISN'T THAT I MISSED BY A FEW WKS OR MONTHS. AS I PAGED THROUGH THE HISTORY OF THE PLANE; I SAW AN OLD ENTRY FOR THE TEST AND A CHILL WENT THROUGH MY BODY. THIS FAR HAS BEEN OFF MY MENTAL CHKLIST FOR YRS! THERE HAVE BEEN NO ATC ALT; MODE C OR SQUAWK CODE COMPLAINTS INVOLVING ANY FLT OF THIS PLANE. MY INSURANCE COMPANY INQUIRES ANNUALLY AS TO WHEN MY MEDICAL IS DUE. THE SAME GOES FOR BFR'S. IT IS HARD TO MISS THE ELT BATTERY BECAUSE THE ANNUAL INSPECTION REQUIRES IT BE GOOD THROUGH THE NEXT YR. THESE OTHER SCHEDULED RESPONSIBILITIES HAVE A BACKUP MEMORY JOGGER. THIS ONE JUST FADED FROM MY MIND AND DIDN'T RESURFACE UNTIL I HAD THIS OCCASION TO BE THOUGHTFULLY PAGING THROUGH THE PLANE'S HISTORY. I KEEP A LOGSHEET IN THE PLANE TO TRACK ENG/AIRFRAME TIME ON A PER FLT BASIS. AT THE BOTTOM OF THAT SHEET; I HAVE BLANKS FOR 'NEXT OIL CHANGE DUE ______' AND 'VOR TEST: DATE; PLACE; INITIALS.' A 'XPONDER DUE DATE' BLANK WILL BE ADDED TO THAT SHEET; WHICH WILL SOLVE THE PROB FOR ME SINGULARLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE IMPRESSION THE INSPECTION WAS OVERDUE WAS FALSE. THE RPTR SAID UPON CONSULTING WITH THE MAINT ORGANIZATION WHO DID THE ANNUAL INSPECTION IT WAS DISCOVERED THE ALTIMETER WAS REPLACED AND THE XPONDER AND ALTIMETER WERE TESTED. THE RPTR STATED THE INFO WAS NOT ENTERED IN THE LOGBOOK BUT IN THE ANNUAL CHK PAPERWORK.