Narrative:

I taxied out for takeoff completing the run-up while taxiing. During the run-up, I observed a 300 RPM drop on the right engine with the left magneto off. As I held short in position for takeoff, I increased the RPM to 1800 RPM and leaned the mixture in an attempt to burn off the fouled plug. The tower then cleared me for takeoff, and as I rolled into position, I checked the magneto one last time on the right engine. The right magneto dropped very close if not a little over the 175 RPM maximum. I elected to perform the takeoff, however, I still had an inkling of doubt about the magneto. I rotated at about 85-87 KIAS. An instant after rotation, I climbed 6-12 inches into the air, the stall horn activated, and the aircraft sunk briskly back to the runway. In my judgement, the airplane would not fly, so I promptly elected to abort the takeoff. Soon after the decision to abort, I realized I would not be able to stop on the remaining runway, so pulled the mixtures to instant cut-off, master off, and magnetos off. The airplane stopped approximately 100 yards off the end off the runway. No one was injured and the aircraft was undamaged. I believe that the causal factors were: 1) hurried pace that was not conducive to a thorough, unhurried run-up. 2) not taking the time to be sure the magneto was operating at 100%. 3) a faulty stall warning indicator that was known by other pilots to have gone off prematurely. Often these other pilots would pull the stall warning circuit breaker and leave it that way. I never noticed the problem on my limited (12 hours) amount of experience flying the airplane. 4) the airplane was 126 pounds over gross weight. 5) possible moderate windshear.

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Original NASA ASRS Text

Title: A PA31 ATX PLT RUNS OFF THE END OF THE RWY AFTER ATTEMPTING AN AIRBORNE ABORT.

Narrative: I TAXIED OUT FOR TKOF COMPLETING THE RUN-UP WHILE TAXIING. DURING THE RUN-UP, I OBSERVED A 300 RPM DROP ON THE R ENG WITH THE L MAGNETO OFF. AS I HELD SHORT IN POS FOR TKOF, I INCREASED THE RPM TO 1800 RPM AND LEANED THE MIXTURE IN AN ATTEMPT TO BURN OFF THE FOULED PLUG. THE TWR THEN CLRED ME FOR TKOF, AND AS I ROLLED INTO POS, I CHKED THE MAGNETO ONE LAST TIME ON THE R ENG. THE R MAGNETO DROPPED VERY CLOSE IF NOT A LITTLE OVER THE 175 RPM MAX. I ELECTED TO PERFORM THE TKOF, HOWEVER, I STILL HAD AN INKLING OF DOUBT ABOUT THE MAGNETO. I ROTATED AT ABOUT 85-87 KIAS. AN INSTANT AFTER ROTATION, I CLBED 6-12 INCHES INTO THE AIR, THE STALL HORN ACTIVATED, AND THE ACFT SUNK BRISKLY BACK TO THE RWY. IN MY JUDGEMENT, THE AIRPLANE WOULD NOT FLY, SO I PROMPTLY ELECTED TO ABORT THE TKOF. SOON AFTER THE DECISION TO ABORT, I REALIZED I WOULD NOT BE ABLE TO STOP ON THE REMAINING RWY, SO PULLED THE MIXTURES TO INSTANT CUT-OFF, MASTER OFF, AND MAGNETOS OFF. THE AIRPLANE STOPPED APPROX 100 YARDS OFF THE END OFF THE RWY. NO ONE WAS INJURED AND THE ACFT WAS UNDAMAGED. I BELIEVE THAT THE CAUSAL FACTORS WERE: 1) HURRIED PACE THAT WAS NOT CONDUCIVE TO A THOROUGH, UNHURRIED RUN-UP. 2) NOT TAKING THE TIME TO BE SURE THE MAGNETO WAS OPERATING AT 100%. 3) A FAULTY STALL WARNING INDICATOR THAT WAS KNOWN BY OTHER PLTS TO HAVE GONE OFF PREMATURELY. OFTEN THESE OTHER PLTS WOULD PULL THE STALL WARNING CIRCUIT BREAKER AND LEAVE IT THAT WAY. I NEVER NOTICED THE PROB ON MY LIMITED (12 HRS) AMOUNT OF EXPERIENCE FLYING THE AIRPLANE. 4) THE AIRPLANE WAS 126 LBS OVER GROSS WT. 5) POSSIBLE MODERATE WINDSHEAR.

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.