Narrative:

Taxied out for takeoff at dayton en route to dallas. We had proper weight and balance and completed all checklists including before takeoff down the the line. Trim was properly set (6.7) flaps set 5 degree and speeds V2 approximately 146 KTS all set. Clearance for position and hold 24R. Upon finishing the checklist I found that the elevator controls felt blocked when pushing forward on yoke to check elevator power. This sometimes happens in gusty/windy situations. Winds were 270-280 at 20-25 KTS. I thought this was strange since aircraft was pointing mostly into the wind. Captain lined up with runway and I tried to check controls again. They again felt blocked. A lot of resistance. I said something to captain. He reached forward and pushed yoke forward. The 'elevator power on' blue light came on, okay! At that time, cleared for takeoff. My leg, I advanced to takeoff power and gave throttles to captain through 100 KTS, nose got very light. No big deal I applied forward pressure (more, I always hold a little until V1) then nose started to rise rapidly! I applied full nose down pressure. Nose continued to rise. I started nose down trim at about 1-2 units of down trim nose quit rising. We were at 6-7 degree nose up attitude at about vr. Main gear left runway. Aircraft accelerated to V2-V2 plus 10 'gear up' and nose started rising again. I was still holding a lot of nose down forward pressure on yoke. I started running trim again. All of a sudden the pressure let loose (200-300 ft AGL at 160-170 KTS). The control column jerked. The aircraft nose dipped down and the control pressures were normal. All of this happened very fast. Captain thought I had rotated early on takeoff. I explained the nose up pressures to him. Rest of flight uneventful. In dfw on arrival, called maintenance and explained in detail. They had no answer but performed a complete control check which was normal. It seemed my opinion that maybe an elevator was stuck up on takeoff. Then finally let loose. I have no explanation at all. Captain did not notice that I was struggling with a nose up control pressure problem on takeoff. I did say something on takeoff about 'the nose wants to come up.' I was surprised with the nose came up to 6-7 degrees and I stopped the pitch up, that my airspeed was as low at it was. I should have been at V2 plus 20, not at vr. Again everything was happening fast and I got very preoccupied with trying to keep the nose from rising further. We flew the airplane for 3 legs before this flight and for 2 legs after this flight. All were normal.

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Original NASA ASRS Text

Title: THE ACFT NOSE RISING ON TKOF ROLL CAUSED FO FLYING TO ROTATE EARLY. TKOF WAS SUCCESSFUL BUT BARELY UNDER LONGITUDINAL CTL.

Narrative: TAXIED OUT FOR TKOF AT DAYTON ENRTE TO DALLAS. WE HAD PROPER WEIGHT AND BALANCE AND COMPLETED ALL CHKLISTS INCLUDING BEFORE TKOF DOWN THE THE LINE. TRIM WAS PROPERLY SET (6.7) FLAPS SET 5 DEG AND SPDS V2 APPROX 146 KTS ALL SET. CLRNC FOR POSITION AND HOLD 24R. UPON FINISHING THE CHKLIST I FOUND THAT THE ELEVATOR CTLS FELT BLOCKED WHEN PUSHING FORWARD ON YOKE TO CHK ELEVATOR PWR. THIS SOMETIMES HAPPENS IN GUSTY/WINDY SITUATIONS. WINDS WERE 270-280 AT 20-25 KTS. I THOUGHT THIS WAS STRANGE SINCE ACFT WAS POINTING MOSTLY INTO THE WIND. CAPT LINED UP WITH RWY AND I TRIED TO CHK CTLS AGAIN. THEY AGAIN FELT BLOCKED. A LOT OF RESISTANCE. I SAID SOMETHING TO CAPT. HE REACHED FORWARD AND PUSHED YOKE FORWARD. THE 'ELEVATOR PWR ON' BLUE LIGHT CAME ON, OKAY! AT THAT TIME, CLRED FOR TKOF. MY LEG, I ADVANCED TO TKOF PWR AND GAVE THROTTLES TO CAPT THROUGH 100 KTS, NOSE GOT VERY LIGHT. NO BIG DEAL I APPLIED FORWARD PRESSURE (MORE, I ALWAYS HOLD A LITTLE UNTIL V1) THEN NOSE STARTED TO RISE RAPIDLY! I APPLIED FULL NOSE DOWN PRESSURE. NOSE CONTINUED TO RISE. I STARTED NOSE DOWN TRIM AT ABOUT 1-2 UNITS OF DOWN TRIM NOSE QUIT RISING. WE WERE AT 6-7 DEG NOSE UP ATTITUDE AT ABOUT VR. MAIN GEAR LEFT RWY. ACFT ACCELERATED TO V2-V2 PLUS 10 'GEAR UP' AND NOSE STARTED RISING AGAIN. I WAS STILL HOLDING A LOT OF NOSE DOWN FORWARD PRESSURE ON YOKE. I STARTED RUNNING TRIM AGAIN. ALL OF A SUDDEN THE PRESSURE LET LOOSE (200-300 FT AGL AT 160-170 KTS). THE CTL COLUMN JERKED. THE ACFT NOSE DIPPED DOWN AND THE CTL PRESSURES WERE NORMAL. ALL OF THIS HAPPENED VERY FAST. CAPT THOUGHT I HAD ROTATED EARLY ON TKOF. I EXPLAINED THE NOSE UP PRESSURES TO HIM. REST OF FLT UNEVENTFUL. IN DFW ON ARR, CALLED MAINT AND EXPLAINED IN DETAIL. THEY HAD NO ANSWER BUT PERFORMED A COMPLETE CTL CHK WHICH WAS NORMAL. IT SEEMED MY OPINION THAT MAYBE AN ELEVATOR WAS STUCK UP ON TKOF. THEN FINALLY LET LOOSE. I HAVE NO EXPLANATION AT ALL. CAPT DID NOT NOTICE THAT I WAS STRUGGLING WITH A NOSE UP CTL PRESSURE PROB ON TKOF. I DID SAY SOMETHING ON TKOF ABOUT 'THE NOSE WANTS TO COME UP.' I WAS SURPRISED WITH THE NOSE CAME UP TO 6-7 DEGS AND I STOPPED THE PITCH UP, THAT MY AIRSPD WAS AS LOW AT IT WAS. I SHOULD HAVE BEEN AT V2 PLUS 20, NOT AT VR. AGAIN EVERYTHING WAS HAPPENING FAST AND I GOT VERY PREOCCUPIED WITH TRYING TO KEEP THE NOSE FROM RISING FURTHER. WE FLEW THE AIRPLANE FOR 3 LEGS BEFORE THIS FLT AND FOR 2 LEGS AFTER THIS FLT. ALL WERE NORMAL.

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.