Narrative:

We were accomplishing a rolling takeoff. I pushed the throttles up to the recommended initial position while lining up with runway. It was the first officer's leg, so he took over the throttles and steering. #2 engine was very slow to spool up; the first officer pushed the 'toga' button with #1 spooled but #2 lagging badly. The resulting asymmetrical thrust caused a strong turning moment to the right. With #1 engine still well below takeoff power and #2 spooling, I pulled both to idle and disconnected the automatic-throttles. We then taxied clear of the runway. Tower asked the nature of the problem; I replied that there was no problem, we weren't ready for takeoff. Since power was not set for takeoff, I don't feel this was an aborted takeoff situation per southeast. Since the tower controller asked no further questions, we assumed he concurred. Regardless of my perception of my copilot's level of competence, I will now brief each one on the importance of not pressing 'toga' until both engines are spooled. Supplemental information from acn 188717. Tower cleared us for an immediate takeoff with an aircraft on a 2 mi final. Copilot was very rushed from the start. External airstart first engine is unusual and accomplished by reference to abnormal procedures. Captain failed to comply with company procedures of evenly spooled engines before pressing toga button.

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Original NASA ASRS Text

Title: FLC LOST CTL OF ACR MLG WHEN UNEVEN ENG SPOOL UP OCCURRED AS TOGA BUTTON WAS ACTIVATED.

Narrative: WE WERE ACCOMPLISHING A ROLLING TKOF. I PUSHED THE THROTTLES UP TO THE RECOMMENDED INITIAL POS WHILE LINING UP WITH RWY. IT WAS THE FO'S LEG, SO HE TOOK OVER THE THROTTLES AND STEERING. #2 ENG WAS VERY SLOW TO SPOOL UP; THE FO PUSHED THE 'TOGA' BUTTON WITH #1 SPOOLED BUT #2 LAGGING BADLY. THE RESULTING ASYMMETRICAL THRUST CAUSED A STRONG TURNING MOMENT TO THE R. WITH #1 ENG STILL WELL BELOW TKOF PWR AND #2 SPOOLING, I PULLED BOTH TO IDLE AND DISCONNECTED THE AUTO-THROTTLES. WE THEN TAXIED CLR OF THE RWY. TWR ASKED THE NATURE OF THE PROBLEM; I REPLIED THAT THERE WAS NO PROBLEM, WE WEREN'T READY FOR TKOF. SINCE PWR WAS NOT SET FOR TKOF, I DON'T FEEL THIS WAS AN ABORTED TKOF SITUATION PER SE. SINCE THE TWR CTLR ASKED NO FURTHER QUESTIONS, WE ASSUMED HE CONCURRED. REGARDLESS OF MY PERCEPTION OF MY COPLT'S LEVEL OF COMPETENCE, I WILL NOW BRIEF EACH ONE ON THE IMPORTANCE OF NOT PRESSING 'TOGA' UNTIL BOTH ENGS ARE SPOOLED. SUPPLEMENTAL INFO FROM ACN 188717. TWR CLRED US FOR AN IMMEDIATE TKOF WITH AN ACFT ON A 2 MI FINAL. COPLT WAS VERY RUSHED FROM THE START. EXTERNAL AIRSTART FIRST ENG IS UNUSUAL AND ACCOMPLISHED BY REF TO ABNORMAL PROCS. CAPT FAILED TO COMPLY WITH COMPANY PROCS OF EVENLY SPOOLED ENGS BEFORE PRESSING TOGA BUTTON.

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.