<< >> NASA ASRS Report 897425, July 2010

A B737-700 flight crew reported number two engine rolled back to idle when takeoff thrust was applied at the end of the runway. They returned to the gate for maintenance attention.

Attributes
ACN	897425
Time
Date	201007
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

We slowly taxied onto the departure runway and then we were cleared for takeoff. We stabilized the power at forty percent then pressed the toga button to use the auto throttle system to set max power. The number one engine responded normally; both throttles responded normally; but the number two engine rolled back to approximately twenty eight percent. The result was quickly deteriorating directional control. My response was to immediately pull both throttles back manually and simultaneously [I] applied full left rudder and brakes as necessary to keep the aircraft on the paved surface. We brought the aircraft under control and taxied clear of the runway and waited for a gate to return to. After calling maintenance control we shut down both engines while waiting for a gate. When a gate became open; we taxied in on engine number one only. Then we turned the aircraft over to maintenance

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Original NASA ASRS Text

Title: A B737-700 flight crew reported number two engine rolled back to idle when takeoff thrust was applied at the end of the runway. They returned to the gate for maintenance attention.

Narrative: We slowly taxied onto the departure runway and then we were cleared for takeoff. We stabilized the power at forty percent then pressed the TOGA button to use the auto throttle system to set max power. The number one engine responded normally; both throttles responded normally; but the number two engine rolled back to approximately twenty eight percent. The result was quickly deteriorating directional control. My response was to immediately pull both throttles back manually and simultaneously [I] applied full left rudder and brakes as necessary to keep the aircraft on the paved surface. We brought the aircraft under control and taxied clear of the runway and waited for a gate to return to. After calling Maintenance Control we shut down both engines while waiting for a gate. When a gate became open; we taxied in on engine number one only. Then we turned the aircraft over to Maintenance

Data retrieved from NASA's ASRS site as of April 2012 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.