A320 FLC FLEW ACFT WITH INTERMIXED ENGS DUE TO MAINT DISCREPANCY WHEN CHANGING ONE OF THE ENGS DUE TO PREVIOUS INFLT ENG FAILURE.

Narrative

PICKED UP A320 ACFT X FOR FLT ABCD AT XA00. SAW MAINT LOG THAT ACFT HAD DIVERTED TO JFK DUE ENG FAILURE AND WAS FERRIED AFTER ENG CHANGE ON JUL/SUN/01 AND HAD BEEN SIGNED OFF BY MAINT. FO AND I JOKED THAT MAINT HAD PROBABLY HUNG A DC9 ENG ON IT. ON ENG START; GOT ECAM 'CHK ENG TYPE.' HAD ALREADY CHKED INITIAL PAGE AND SAW PROPER DATA BASE AND ENG TYPE. NO FURTHER ACTION ON ECAM PAGE WAS DESIGNATED; BUT ALSO CHKED OUR QRH AND WENT INTO PLT'S HANDBOOK WHICH STATED 'FOR CREW AWARENESS' AND NO FURTHER ACTION. WE THOUGHT 'JUST A GLITCH IN COMPUTER PROGRAM' AS ENG PARAMETERS ON START LOOKED NORMAL WHEN BOTH HAD BEEN STARTED. FLEW TO BOS; NORMAL FLT; 1 ENG BURNING APPROX 200 LBS LESS THAN OTHER. LANDED IN BOS; AND SAW MAINT PERSONNEL ON DECK AND ASKED HIM ABOUT ECAM AND HE SAID PROBABLY SOME PINS ON COMPUTER NEEDED TWEAKING AND LEFT IT AT THAT. DIDN'T WRITE UP ECAM BECAUSE HAD CLRED IT AND DIDN'T SHOW UP ON STATUS. FLEW BACK -- GOT SAME ECAM AND WROTE UP ACFT FOR MAINT TO LOOK AT IT; BECAUSE I DIDN'T WANT TO GO THROUGH ANOTHER DAY WITH GETTING ECAM. MAINT TOOK ACFT AND GAVE US ANOTHER ACFT AS THEY WERE GOING TO LOOK AT MY ACFT X. TURNS OUT ACFT X HAD GOTTEN NEW ENG; BUT MAINT HADN'T SET PINS FOR A320; BUT HAD PINS SET FOR A319. ACFT HAD BEEN SIGNED OFF BY MAINT; SO WE ASSUMED QUALITY ASSURANCE WAS WORKING. TRAINING DOESN'T GO INTO ENG PARAMETERS FOR SPECIFIC TYPES OF ENG. LONG AND SHORT OF IT -- WE FLEW ACFT WITH ENG INTERMIX WITHOUT KNOWING IT.