AN MD88 WAS FOUND TO HAVE #2 ENG OVERSPD; EXHAUST GAS TEMP OVER LIMITS AND FUEL FLOW OUT OF LIMITS BY READING THE FDR.

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ACR ACFT; AN MD88; EXPERIENCED A #2 ENG N1 OVERSPD ON FLT. USING THE ENG DISPLAY PANEL TO READ THE RECORDED OVERSPD CONDITION; A VALUE OF 102.8% WAS REACHED. PER THE MD88 MAINT MANUAL 72-00-00-5; ALL INSPECTIONS WERE PERFORMED AND NO DEVS FOUND. AS A PRECAUTION; DUE TO PREVIOUS EXPERIENCE OF THE EDP READING DIFFERENT THAN THE FDR; I PULLED THE FDR AND HAD THE INFO READ. THE ACFT DEPARTED ZZZ ON FLT WITHOUT INCIDENT AND CONTINUED TO ZZA ON ANOTHER FLT; ALSO WITHOUT INCIDENT. DURING THIS TIME; THE FDR INFO WAS READ AND FOUND THAT THE ENG ACTUALLY REACHED 103.3% N1; BUT ALSO OVER BOOSTED; HAD AN EGT EXCEEDANCE AND A FUEL FLOW INDICATION OUT OF LIMITS. THE ACFT WAS IMMEDIATELY GNDED AND PREPARED FOR A MAINT FERRY BACK TO MAINT BASE ON FLT WHICH INCLUDED REPLACING THE FAN AND HUB ASSEMBLY. CONTRIBUTING FACTORS WERE THE INABILITY OF EDP TO PROVIDE AN ACCURATE READING WITH ITS ROLLING TAPE DISPLAY AND PREVIOUS EXPERIENCE WITH CONFLICTING READINGS OF THE EDP AND FDR. ITEM WAS DISCOVERED THROUGH A PLT RPT AND WAS ALSO FOUND TO BE INCOMPLETE AFTER FDR READOUT. COMPANY POLICY IS TO TRUST THE EDP AND PROC WAS FOLLOWED AS SUCH. PULLING OF THE FDR WAS AS PRECAUTIONARY EVEN THOUGH IT WAS NOT NEEDED. THE MISTAKE WAS MADE IN FLYING THE ACFT BEFORE THE DATA FROM THE FDR WAS READ BUT THIS IS NOT IN COMPANY POLICY AS OF THIS TIME (AUG/FRI/01). AS FAR AS ACR IS CONCERNED; THE EDP READING IS ACCURATE AND SHOULD BE TRUSTED. I DO NOT LOOK AT IT THIS WAY BECAUSE OF INFO SAMPLING NOTES; BUT I WAS LED TO BELIEVE BY 2 OTHER SOURCES THAT THIS INFO IS ACCURATE AND THAT IS WHY WE FLEW THE ACFT ON A REVENUE PAX FLT.