Narrative:

The problem of throttle stagger arose after an engine change. The problem resulted in a log write-up after approximately 14 hours of operation. Log write-up reads: left throttle ahead. Throttles not aligned within 1 inch at knob, at same EPR, at all power settings. Electronic engine controls on. EICAS EPR command sector normal. Engine parameters normal. All parameters/indicators normal and matched. Left throttle ahead.' I got the call from ZZZ mechanic asking if he could defer this log write-up and quoted maintenance manual 76-11-00 page 100A. My response was no, I need some more information. I queried mechanic as to what actions have been taken. 1) are there any fault messages? No. 2) can you take a look at EICAS and see how the thrust lever angle reads? Preferably at part power compared to the right engine (a quick check), I suspect thrust lever angle could be the problem. No, crew and passenger on board and we're getting ready to push. 3) I'll check the engine control maintenance computer data. The engine control maintenance computer was down. Aircraft departed with log item deferred. The aircraft flew that leg and another leg with no comments regarding the throttle stagger. On the next takeoff, aircraft aborted due to being throttle limited. The cause was an incorrect data entry plug installed. Before finding the wrong data entry plug, the electronic engine control was replaced to no avail. The engine performance confign specifications page that shows engine confign was accessed and that revealed the problem.

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Original NASA ASRS Text

Title: A B767-300 ABORTED TKOF DUE TO #1 ENG BEING THROTTLE LIMITED CAUSED BY THE INCORRECT DATA ENTRY PLUG INSTALLED ON THE ELECTRONIC ENG CTL.

Narrative: THE PROB OF THROTTLE STAGGER AROSE AFTER AN ENG CHANGE. THE PROB RESULTED IN A LOG WRITE-UP AFTER APPROX 14 HRS OF OP. LOG WRITE-UP READS: L THROTTLE AHEAD. THROTTLES NOT ALIGNED WITHIN 1 INCH AT KNOB, AT SAME EPR, AT ALL PWR SETTINGS. ELECTRONIC ENG CTLS ON. EICAS EPR COMMAND SECTOR NORMAL. ENG PARAMETERS NORMAL. ALL PARAMETERS/INDICATORS NORMAL AND MATCHED. L THROTTLE AHEAD.' I GOT THE CALL FROM ZZZ MECH ASKING IF HE COULD DEFER THIS LOG WRITE-UP AND QUOTED MAINT MANUAL 76-11-00 PAGE 100A. MY RESPONSE WAS NO, I NEED SOME MORE INFO. I QUERIED MECH AS TO WHAT ACTIONS HAVE BEEN TAKEN. 1) ARE THERE ANY FAULT MESSAGES? NO. 2) CAN YOU TAKE A LOOK AT EICAS AND SEE HOW THE THRUST LEVER ANGLE READS? PREFERABLY AT PART PWR COMPARED TO THE R ENG (A QUICK CHK), I SUSPECT THRUST LEVER ANGLE COULD BE THE PROB. NO, CREW AND PAX ON BOARD AND WE'RE GETTING READY TO PUSH. 3) I'LL CHK THE ENG CTL MAINT COMPUTER DATA. THE ENG CTL MAINT COMPUTER WAS DOWN. ACFT DEPARTED WITH LOG ITEM DEFERRED. THE ACFT FLEW THAT LEG AND ANOTHER LEG WITH NO COMMENTS REGARDING THE THROTTLE STAGGER. ON THE NEXT TKOF, ACFT ABORTED DUE TO BEING THROTTLE LIMITED. THE CAUSE WAS AN INCORRECT DATA ENTRY PLUG INSTALLED. BEFORE FINDING THE WRONG DATA ENTRY PLUG, THE ELECTRONIC ENG CTL WAS REPLACED TO NO AVAIL. THE ENG PERFORMANCE CONFIGN SPECS PAGE THAT SHOWS ENG CONFIGN WAS ACCESSED AND THAT REVEALED THE 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.