Narrative:

Was sent out to work an 'EICAS disagree' message on lower EICAS display on aircraft X. Message would clear; only to recur shortly. Disagree code was; '#2 engine egt.' noted 15 degree split between left EICAS #2 engine egt readout and right EICAS #2 engine egt readout during engine run at gate. Replaced left EICAS computer; cross loaded software from left EICAS computer to right EICAS computer. Ran #2 engine again and left and right EICAS computer both read the same. #2 engine egt and 'EICAS disagree' message was no longer present. Signed logbook; dispatched aircraft. Found out later that I had cross loaded the EICAS computer software the wrong way. The left (new) EICAS computer that I installed had B757 software in its memory. When I cross loaded from left to right; I inadvertently installed B757 software into both computers that were in a B767 aircraft. There was a card attached to the new computer from stock denoting the software version; but not designating the installed program as being B757 software. The computers in the stockroom should have a label attached over at the shop denoting which aircraft's software is installed when they leave the shop. However; the error was entirely my own. Callback conversation with reporter revealed the following information: the computer parts tag only indicates the loaded software is current; but does not advise what aircraft software; B757 or B767. The left computer was installed and the error was made in cross loading the software from the replaced computer into the right EICAS computer. Now both were loaded with B757-200 software. The manufacturer should have had a chip installed to alert the technician and crew of this situation. The fault was discovered that night in a station making an overnight check. The technician making the EICAS computer check came up with hydraulic motor generator valve faults only because the B757 does not have this system.

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Original NASA ASRS Text

Title: A B767 WAS DISPATCHED WITH B757-200 SOFTWARE LOADED IN BOTH EICAS COMPUTERS. SIT OCCURRED WHEN L EICAS COMPUTER WAS REPLACED.

Narrative: WAS SENT OUT TO WORK AN 'EICAS DISAGREE' MSG ON LOWER EICAS DISPLAY ON ACFT X. MESSAGE WOULD CLEAR; ONLY TO RECUR SHORTLY. DISAGREE CODE WAS; '#2 ENG EGT.' NOTED 15 DEG SPLIT BETWEEN L EICAS #2 ENG EGT READOUT AND R EICAS #2 ENG EGT READOUT DURING ENG RUN AT GATE. REPLACED L EICAS COMPUTER; CROSS LOADED SOFTWARE FROM L EICAS COMPUTER TO R EICAS COMPUTER. RAN #2 ENG AGAIN AND L AND R EICAS COMPUTER BOTH READ THE SAME. #2 ENG EGT AND 'EICAS DISAGREE' MESSAGE WAS NO LONGER PRESENT. SIGNED LOGBOOK; DISPATCHED ACFT. FOUND OUT LATER THAT I HAD CROSS LOADED THE EICAS COMPUTER SOFTWARE THE WRONG WAY. THE L (NEW) EICAS COMPUTER THAT I INSTALLED HAD B757 SOFTWARE IN ITS MEMORY. WHEN I CROSS LOADED FROM L TO R; I INADVERTENTLY INSTALLED B757 SOFTWARE INTO BOTH COMPUTERS THAT WERE IN A B767 ACFT. THERE WAS A CARD ATTACHED TO THE NEW COMPUTER FROM STOCK DENOTING THE SOFTWARE VERSION; BUT NOT DESIGNATING THE INSTALLED PROGRAM AS BEING B757 SOFTWARE. THE COMPUTERS IN THE STOCKROOM SHOULD HAVE A LABEL ATTACHED OVER AT THE SHOP DENOTING WHICH ACFT'S SOFTWARE IS INSTALLED WHEN THEY LEAVE THE SHOP. HOWEVER; THE ERROR WAS ENTIRELY MY OWN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE COMPUTER PARTS TAG ONLY INDICATES THE LOADED SOFTWARE IS CURRENT; BUT DOES NOT ADVISE WHAT ACFT SOFTWARE; B757 OR B767. THE L COMPUTER WAS INSTALLED AND THE ERROR WAS MADE IN CROSS LOADING THE SOFTWARE FROM THE REPLACED COMPUTER INTO THE R EICAS COMPUTER. NOW BOTH WERE LOADED WITH B757-200 SOFTWARE. THE MANUFACTURER SHOULD HAVE HAD A CHIP INSTALLED TO ALERT THE TECHNICIAN AND CREW OF THIS SIT. THE FAULT WAS DISCOVERED THAT NIGHT IN A STATION MAKING AN OVERNIGHT CHK. THE TECHNICIAN MAKING THE EICAS COMPUTER CHK CAME UP WITH HYDRAULIC MOTOR GENERATOR VALVE FAULTS ONLY BECAUSE THE B757 DOES NOT HAVE THIS SYSTEM.

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.