B737-300 rejects takeoff due to deficient thrust from right engine.

Attributes
ACN	762450
Time
Date	200711
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC Marginal
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 11500 flight time type : 7000
ASRS Report	762450
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : n1 gauge other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff roll at ZZZ; the first officer advanced both throttles to set takeoff N1 which was to be 88.1% N1. At approximately 81% N1 first officer pushed toga button. Both throttles advanced and I; the captain; took control of the throttles. The #1 engine produced 88.1% N1. The #2 engine lagged behind #1 at approximately 81-82% N1. All other #2 engine indications were lower than the #1 engine indications. When I manually advanced the #2 throttle toward 88.1% N1; the throttle was forward of #1 throttle by 3.5 inches or about 3 knob widths. This was an abnormal throttle position and the #2 engine was not producing adequate takeoff thrust; so I decided to abort the takeoff. The abort was initiated around 80 KTS. The highest speed observed was 90 KTS; which we used to reference the brake cooling chart. We followed all SOP's and ran all appropriate checklists. We returned to the gate; shut down both engines; and had the aircraft chocked. We then called maintenance and provided them with the details.

Original NASA ASRS Text

Title: B737-300 REJECTS TKOF DUE TO DEFICIENT THRUST FROM RIGHT ENGINE.

Narrative: ON TKOF ROLL AT ZZZ; THE FO ADVANCED BOTH THROTTLES TO SET TKOF N1 WHICH WAS TO BE 88.1% N1. AT APPROX 81% N1 FO PUSHED TOGA BUTTON. BOTH THROTTLES ADVANCED AND I; THE CAPT; TOOK CTL OF THE THROTTLES. THE #1 ENG PRODUCED 88.1% N1. THE #2 ENG LAGGED BEHIND #1 AT APPROX 81-82% N1. ALL OTHER #2 ENG INDICATIONS WERE LOWER THAN THE #1 ENG INDICATIONS. WHEN I MANUALLY ADVANCED THE #2 THROTTLE TOWARD 88.1% N1; THE THROTTLE WAS FORWARD OF #1 THROTTLE BY 3.5 INCHES OR ABOUT 3 KNOB WIDTHS. THIS WAS AN ABNORMAL THROTTLE POS AND THE #2 ENG WAS NOT PRODUCING ADEQUATE TKOF THRUST; SO I DECIDED TO ABORT THE TKOF. THE ABORT WAS INITIATED AROUND 80 KTS. THE HIGHEST SPD OBSERVED WAS 90 KTS; WHICH WE USED TO REF THE BRAKE COOLING CHART. WE FOLLOWED ALL SOP'S AND RAN ALL APPROPRIATE CHKLISTS. WE RETURNED TO THE GATE; SHUT DOWN BOTH ENGS; AND HAD THE ACFT CHOCKED. WE THEN CALLED MAINT AND PROVIDED THEM WITH THE DETAILS.

Data retrieved from NASA's ASRS site as of January 2009 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.