PIPER PA31T PLT IS CONCERNED WITH MAINT STATUS OF ACFT.

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OUR FLEET OF AIR AMBULANCE PA31T ARE MAINTAINED BY OUR IN-HOUSE MAINT DEPT. THE STATUS SHEETS THEY PROVIDE TO THE PLTS ARE SOMETIMES STREWN WITH TYPO'S AND INCORRECT VALUES. 1 AIRPLANE WAS CONSISTENTLY NOT UPDATED REGARDING THE TIME A HOT SECTION WAS DUE AND THE ANSWERS TO OUR PLT INQUIRIES TO THE MAINT DEPT WERE INCORRECT. 1 PLANE STATUS SHEET HAD A VALUE FOR HOT SECTION DUE THAT HAD NOT BEEN UPDATED. ANOTHER PLANE HAD A VALUE FOR HOT SECTION DUE THAT WAS CORRECT BUT THE PLTS (ME INCLUDED) WERE TOLD THAT IT WAS A TYPO OR HAD NOT YET BEEN UPDATED IN THEIR COMPUTER SYS. 1 PLANE ACTUALLY DID GO OVER THE HOT SECTION DUE TIME. THE MAINT DEPT THOUGHT THAT IT HAS BEEN COMPLETED BUT JUST HAD NOT YET BEEN UPDATED BECAUSE THEY DID; IN FACT; CONDUCT A HOT SECTION EVENT BUT ON THE WRONG ENG. THEREFORE THE HOT SECTION WAS OVERDUE WHEN PLTS WERE FLYING THE PLANE THROUGH SEP AND OCT 2006. MAINT CORRECTED THE PROB WHEN IT WAS DISCOVERED DURING A QUARTERLY INTERNAL AUDIT FUNCTION AND A SELF-DISCLOSURE WAS INITIATED WITH FAA PMI. THE CHIEF PLT ALSO MADE CHANGES TO PROCS FOR REVIEWING INSPECTION DUE TIMES AND DATES BY CHANGING FORMS AND ADDING AN AIRPLANE SECTION TO THE PLT'S STATUS BOARD. LAYERS WERE ADDED TO THE CHKS AND BALS OF THE PROCESS. ALSO; FROM NOW ON THE PLTS (ME INCLUDED) WILL NOT DISPATCH WITHOUT THE STATUS VERIFIED AND IF THERE IS ANY QUESTION EITHER MAINT OR MGMNT WILL MAKE THE CHANGE PRIOR TO DISPATCHING.