Narrative:

I taxied the aircraft onto runway 28. After the aircraft was aligned, I stated to the first officer, 'the brakes are released, it's your airplane.' the first officer took control of the throttles and flight controls, and applied the initial power setting. I was monitoring the process while at the same time watching outside for possible unrpted traffic, because the yampa valley airport is uncontrolled. The initial power setting appeared to be normal, and there was no yaw. At about 20-30 KTS, as the power was further advanced, the aircraft began the veer to the left. The first officer and I both applied full right rudder. I applied brakes. I placed the throttles into reverse thrust, with emphasis on the right engine. The aircraft continued to veer to the left until it came to a stop at approximately 30 ft from the runway surface. Braking action was reported as fair. The runway surface was plowed, and had packed snow. I think the power came up on the right engine normally, while the left engine was slower to spool up. I think closer monitoring of the engines for asymmetrical thrust may have prevented this problem.

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Original NASA ASRS Text

Title: ACR MLG HAS RWY EXCURSION WHEN FO APPLIES THRUST AND #2 ENG SPOOLS UP FIRST, ENGS DEVELOP ASYMMETRICAL THRUST.

Narrative: I TAXIED THE ACFT ONTO RWY 28. AFTER THE ACFT WAS ALIGNED, I STATED TO THE FO, 'THE BRAKES ARE RELEASED, IT'S YOUR AIRPLANE.' THE FO TOOK CTL OF THE THROTTLES AND FLT CTLS, AND APPLIED THE INITIAL PWR SETTING. I WAS MONITORING THE PROCESS WHILE AT THE SAME TIME WATCHING OUTSIDE FOR POSSIBLE UNRPTED TFC, BECAUSE THE YAMPA VALLEY ARPT IS UNCTLED. THE INITIAL PWR SETTING APPEARED TO BE NORMAL, AND THERE WAS NO YAW. AT ABOUT 20-30 KTS, AS THE PWR WAS FURTHER ADVANCED, THE ACFT BEGAN THE VEER TO THE L. THE FO AND I BOTH APPLIED FULL R RUDDER. I APPLIED BRAKES. I PLACED THE THROTTLES INTO REVERSE THRUST, WITH EMPHASIS ON THE R ENG. THE ACFT CONTINUED TO VEER TO THE L UNTIL IT CAME TO A STOP AT APPROX 30 FT FROM THE RWY SURFACE. BRAKING ACTION WAS RPTED AS FAIR. THE RWY SURFACE WAS PLOWED, AND HAD PACKED SNOW. I THINK THE PWR CAME UP ON THE R ENG NORMALLY, WHILE THE L ENG WAS SLOWER TO SPOOL UP. I THINK CLOSER MONITORING OF THE ENGS FOR ASYMMETRICAL THRUST MAY HAVE PREVENTED THIS PROB.

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.