Narrative:

Upon returning home from a 2 day rotation, I had a phone message to contact company maintenance. I contacted them immediately and they indicated that the aircraft I had brought in was turned down by the outbound crew because engines #1 and #3 tachometers (N1) indicated an overspd condition on their respective tachometers overspd pointers. I told maintenance that I had flown the last 2 legs with this aircraft and had made 2 alternate power takeoffs and no abrupt or excessive power changes to cause the overspd. Our overspd pointers are mechanical and do not reset automatically. They must be reset by pushing a reset switch. Perhaps in my initial cockpit setup the pointers went unnoticed. Additionally, our operating manual states that the pointers are to be checked on engine shutdown because a 'spike' overspd could occur at this time. Again, I could have missed them. My conclusion is that I did not overspd either engine and that a previous crew was responsible, in which case there is no way to determine how long the indication indicating the overspd condition existed or, they spiked on shutdown and I missed them on the shutdown checklist.

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Original NASA ASRS Text

Title: PIC RPT OF N1 OVERSPD CONDITION ON #1 AND #3 ENG TACHOMETER OVERSPD POINTERS. RPTR WAS AT HOME, JUST AFTER FLT, WHEN HE WAS ASKED TO CALL MAINT REGARDING THIS SIT. THE FOLLOWING CREW HAD REFUSED THE ACFT. RPTR DENIES ALLEGATION OF ANY WRONG DOING.

Narrative: UPON RETURNING HOME FROM A 2 DAY ROTATION, I HAD A PHONE MESSAGE TO CONTACT COMPANY MAINT. I CONTACTED THEM IMMEDIATELY AND THEY INDICATED THAT THE ACFT I HAD BROUGHT IN WAS TURNED DOWN BY THE OUTBOUND CREW BECAUSE ENGS #1 AND #3 TACHOMETERS (N1) INDICATED AN OVERSPD CONDITION ON THEIR RESPECTIVE TACHOMETERS OVERSPD POINTERS. I TOLD MAINT THAT I HAD FLOWN THE LAST 2 LEGS WITH THIS ACFT AND HAD MADE 2 ALTERNATE PWR TKOFS AND NO ABRUPT OR EXCESSIVE PWR CHANGES TO CAUSE THE OVERSPD. OUR OVERSPD POINTERS ARE MECHANICAL AND DO NOT RESET AUTOMATICALLY. THEY MUST BE RESET BY PUSHING A RESET SWITCH. PERHAPS IN MY INITIAL COCKPIT SETUP THE POINTERS WENT UNNOTICED. ADDITIONALLY, OUR OPERATING MANUAL STATES THAT THE POINTERS ARE TO BE CHKED ON ENG SHUTDOWN BECAUSE A 'SPIKE' OVERSPD COULD OCCUR AT THIS TIME. AGAIN, I COULD HAVE MISSED THEM. MY CONCLUSION IS THAT I DID NOT OVERSPD EITHER ENG AND THAT A PREVIOUS CREW WAS RESPONSIBLE, IN WHICH CASE THERE IS NO WAY TO DETERMINE HOW LONG THE INDICATION INDICATING THE OVERSPD CONDITION EXISTED OR, THEY SPIKED ON SHUTDOWN AND I MISSED THEM ON THE SHUTDOWN CHKLIST.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.