<< >> NASA ASRS Report 1099199, July 2013

The pilots of a B737-300 observed an N1 overspeed condition of the #2 engine and elected to return to the departure airport. A successful landing was completed.

Attributes
ACN	1099199
Time
Date	201307
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 264 Flight Crew Type 6000
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

We were at about fl 240; deviating in VMC conditions around some weather; when we felt the aircraft yaw to the left. I was the pilot flying and immediately noticed the #2 engine N1 had spiked from 94% to 107% along with the N1 overspeed light. I began pulling the #2 thrust lever back to attempt to get it back under the N1 limit. There was no egt exceedance during this event. After attempting to match up the N1's; there was about a four-inch thrust lever split. We accomplished the engine limit/surge/stall QRH checklist and determined it was best to return to [the departure airport]. We landed uneventfully about 15 minutes later.

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Original NASA ASRS Text

Title: The pilots of a B737-300 observed an N1 overspeed condition of the #2 engine and elected to return to the departure airport. A successful landing was completed.

Narrative: We were at about FL 240; deviating in VMC conditions around some weather; when we felt the aircraft yaw to the left. I was the Pilot Flying and immediately noticed the #2 engine N1 had spiked from 94% to 107% along with the N1 Overspeed light. I began pulling the #2 thrust lever back to attempt to get it back under the N1 limit. There was no EGT exceedance during this event. After attempting to match up the N1's; there was about a four-inch thrust lever split. We accomplished the Engine Limit/Surge/Stall QRH Checklist and determined it was best to return to [the departure airport]. We landed uneventfully about 15 minutes later.

Data retrieved from NASA's ASRS site as of July 2013 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.