At about 120 KTS on the takeoff roll; a B767-200 left engine N1 decayed to approximately 94% so the ...

Attributes
ACN	1042102
Time
Date	201210
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B767-200
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)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During taxi; ATC cleared us to taxi to runway 31 for an intersection departure; it was noted that max thrust was necessary because of a small tailwind. During the application of takeoff thrust all engine parameters appeared normal at about 100 KTS. Left engine N1 decayed to approximately 94% plus or minus 1% with fluctuations; with 'command arc' displayed to the thrust rating computer limit of approximately 102% N1; no adverse yaw noted. Takeoff was then aborted at approximately 120 KTS. Inspection of main landing gear was then conducted by airfield rescue and fire fighter crew. Aircraft was then taxied to gate without further incident. Gross weight at takeoff 295;000 [pounds] O.a.T. 12c.

Original NASA ASRS Text

Title: At about 120 KTS on the takeoff roll; a B767-200 left engine N1 decayed to approximately 94% so the Captain rejected the takeoff and had the main gear inspected prior to proceeding to the gate.

Narrative: During taxi; ATC cleared us to taxi to Runway 31 for an intersection departure; it was noted that max thrust was necessary because of a small tailwind. During the application of takeoff thrust all engine parameters appeared normal at about 100 KTS. Left engine N1 decayed to approximately 94% plus or minus 1% with fluctuations; with 'command arc' displayed to the Thrust Rating Computer limit of approximately 102% N1; no adverse yaw noted. Takeoff was then aborted at approximately 120 KTS. Inspection of main landing gear was then conducted by Airfield Rescue and Fire Fighter crew. Aircraft was then taxied to gate without further incident. Gross weight at takeoff 295;000 [LBS] O.A.T. 12c.

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.

At about 120 KTS on the takeoff roll; a B767-200 left engine N1 decayed to approximately 94% so the captain rejected the takeoff and had the main gear inspected prior to proceeding to the gate.