A B737-200 with #1 engine changed the flight crew reported three-fourths to one knob throttle split.

Attributes
ACN	629757
Time
Date	200405
Day	Tue
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	629757
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft X #1 engine change due C1 damage. I rigged the engine in accordance with the engine rigging work card, after aircraft X made its first flight the crew wrote up a 3/4 to 1 knob throttle split, which is within limit per the pratt and whitney engine manual allowing a 1 1/2 knob split. Since we had the manpower and time we decided to do another static rig on #1 engine to try and get the throttles closer. Although the same procedures were used the mechanic was able to make an adjustment on the teleflex making the rig pin fit perhaps more freely than when I rigged the engine, thus when the engine was ran to check for the throttle split the throttles were better. I did the rigging the way I have done it many times before and sometimes a person does a better job at it than he does at other times. I take my job serious and always try to do my best.

Original NASA ASRS Text

Title: A B737-200 WITH #1 ENG CHANGED THE FLT CREW RPTED THREE-FOURTHS TO ONE KNOB THROTTLE SPLIT.

Narrative: ACFT X #1 ENG CHANGE DUE C1 DAMAGE. I RIGGED THE ENG IN ACCORDANCE WITH THE ENG RIGGING WORK CARD, AFTER ACFT X MADE ITS FIRST FLT THE CREW WROTE UP A 3/4 TO 1 KNOB THROTTLE SPLIT, WHICH IS WITHIN LIMIT PER THE PRATT AND WHITNEY ENG MANUAL ALLOWING A 1 1/2 KNOB SPLIT. SINCE WE HAD THE MANPOWER AND TIME WE DECIDED TO DO ANOTHER STATIC RIG ON #1 ENG TO TRY AND GET THE THROTTLES CLOSER. ALTHOUGH THE SAME PROCS WERE USED THE MECH WAS ABLE TO MAKE AN ADJUSTMENT ON THE TELEFLEX MAKING THE RIG PIN FIT PERHAPS MORE FREELY THAN WHEN I RIGGED THE ENG, THUS WHEN THE ENG WAS RAN TO CHK FOR THE THROTTLE SPLIT THE THROTTLES WERE BETTER. I DID THE RIGGING THE WAY I HAVE DONE IT MANY TIMES BEFORE AND SOMETIMES A PERSON DOES A BETTER JOB AT IT THAN HE DOES AT OTHER TIMES. I TAKE MY JOB SERIOUS AND ALWAYS TRY TO DO MY BEST.

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.