Narrative:

Providence tower had cleared us for takeoff. We completed our takeoff checklist and took the runway. My first officer was a junior captain flying from the left seat. He set takeoff power and either inadvertently, or directly, trimmed aircraft outside the plane's takeoff trim envelope. The takeoff warning horn sounded and the trim annunciator illuminated. The engines never reached takeoff power, due to fadec control of slow windup. Airspeed was 50 KTS or less. I told co-captain to abort, assuming trim malfunction and told tower soon after. No emergency was declared. Takeoff warning can be tested with engines not running, by bringing right thrust lever above mct. Upon clearing the runway, crew performed air after takeoff checklist. I was reaching for the abnormal checklist, when my co-captain admitted his guilt or stupidity. I informed tower that the problem was resolved and we would be ready for takeoff, upon reaching the end. The abort was like a high speed taxi stop. Very little brakes were used and no limitations were exceeded. Upon reaching the runway for the second time, crew performed takeoff checklist. I told him to not touch the trim until after takeoff. Takeoff resulted with no further problems. The tower was very interested what had happened. I simply explained. This is the first time someone trimmed during takeoff roll on me. Including this in our takeoff brief almost seems a waste of time for most crews.

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Original NASA ASRS Text

Title: AN ABORTED TKOF IS PERFORMED BY THE FLT CREW OF AN LJ60 AT 50 KTS AFTER RECEIVING A TKOF CONFIGN WARNING AT PVD, RI.

Narrative: PROVIDENCE TWR HAD CLRED US FOR TKOF. WE COMPLETED OUR TKOF CHKLIST AND TOOK THE RWY. MY FO WAS A JUNIOR CAPT FLYING FROM THE L SEAT. HE SET TKOF PWR AND EITHER INADVERTENTLY, OR DIRECTLY, TRIMMED ACFT OUTSIDE THE PLANE'S TKOF TRIM ENVELOPE. THE TKOF WARNING HORN SOUNDED AND THE TRIM ANNUNCIATOR ILLUMINATED. THE ENGS NEVER REACHED TKOF PWR, DUE TO FADEC CTL OF SLOW WINDUP. AIRSPD WAS 50 KTS OR LESS. I TOLD CO-CAPT TO ABORT, ASSUMING TRIM MALFUNCTION AND TOLD TWR SOON AFTER. NO EMER WAS DECLARED. TKOF WARNING CAN BE TESTED WITH ENGS NOT RUNNING, BY BRINGING R THRUST LEVER ABOVE MCT. UPON CLRING THE RWY, CREW PERFORMED AIR AFTER TKOF CHKLIST. I WAS REACHING FOR THE ABNORMAL CHKLIST, WHEN MY CO-CAPT ADMITTED HIS GUILT OR STUPIDITY. I INFORMED TWR THAT THE PROB WAS RESOLVED AND WE WOULD BE READY FOR TKOF, UPON REACHING THE END. THE ABORT WAS LIKE A HIGH SPD TAXI STOP. VERY LITTLE BRAKES WERE USED AND NO LIMITATIONS WERE EXCEEDED. UPON REACHING THE RWY FOR THE SECOND TIME, CREW PERFORMED TKOF CHKLIST. I TOLD HIM TO NOT TOUCH THE TRIM UNTIL AFTER TKOF. TKOF RESULTED WITH NO FURTHER PROBS. THE TWR WAS VERY INTERESTED WHAT HAD HAPPENED. I SIMPLY EXPLAINED. THIS IS THE FIRST TIME SOMEONE TRIMMED DURING TKOF ROLL ON ME. INCLUDING THIS IN OUR TKOF BRIEF ALMOST SEEMS A WASTE OF TIME FOR MOST CREWS.

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.