Narrative:

The first officer was flying a night visual approach into a mountainous airport. He flared a little high and floated far enough down the runway that I was concerned about being able to stop on the runway. I commanded a go around. The first officer immediately applied power and we began our missed approach procedures. I noticed a flashing coming from the engine instrument panel, looking closer I noticed the EPR was a little above the target EPR bug. I pointed to the EPR gauges. The first officer immediately pulled the throttles back a little, all the flashing stopped. At this point, I thought we had simply 'overboosted' the EPR by a little for 3-5 seconds. We completed the missed approach, came around and had a normal landing. A few mins later, riding the hotel van to the layover hotel, I realized the 'EPR overboost' wasn't the only problem we had. I could not remember which gauge had been flashing, but the flashing had been below the EPR gauges, making it either N1, egt, or N2. After arriving at the layover hotel, I immediately called the dispatcher, and with maintenance online, explained that I had diagnosed the problem incorrectly. In addition to what I thought was a minor, short duration EPR overboost, we must have exceeded the engine limits on either N1, egt, or N2. The company took the plane OTS, we later ferried the empty airplane to a maintenance station. Supplemental information from acn 440307: flight data recorded was removed. Engine checks were performed with maintenance on board. Engine run-ups were ok and aircraft was ferried back to maintenance base for thorough engine checks and flight data recorder review. Engines did turn out to be overboosted and were replaced.

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Original NASA ASRS Text

Title: DURING GAR, ACR FLC OVERBOOSTS ENGS.

Narrative: THE FO WAS FLYING A NIGHT VISUAL APCH INTO A MOUNTAINOUS ARPT. HE FLARED A LITTLE HIGH AND FLOATED FAR ENOUGH DOWN THE RWY THAT I WAS CONCERNED ABOUT BEING ABLE TO STOP ON THE RWY. I COMMANDED A GAR. THE FO IMMEDIATELY APPLIED PWR AND WE BEGAN OUR MISSED APCH PROCS. I NOTICED A FLASHING COMING FROM THE ENG INST PANEL, LOOKING CLOSER I NOTICED THE EPR WAS A LITTLE ABOVE THE TARGET EPR BUG. I POINTED TO THE EPR GAUGES. THE FO IMMEDIATELY PULLED THE THROTTLES BACK A LITTLE, ALL THE FLASHING STOPPED. AT THIS POINT, I THOUGHT WE HAD SIMPLY 'OVERBOOSTED' THE EPR BY A LITTLE FOR 3-5 SECONDS. WE COMPLETED THE MISSED APCH, CAME AROUND AND HAD A NORMAL LNDG. A FEW MINS LATER, RIDING THE HOTEL VAN TO THE LAYOVER HOTEL, I REALIZED THE 'EPR OVERBOOST' WASN'T THE ONLY PROB WE HAD. I COULD NOT REMEMBER WHICH GAUGE HAD BEEN FLASHING, BUT THE FLASHING HAD BEEN BELOW THE EPR GAUGES, MAKING IT EITHER N1, EGT, OR N2. AFTER ARRIVING AT THE LAYOVER HOTEL, I IMMEDIATELY CALLED THE DISPATCHER, AND WITH MAINT ONLINE, EXPLAINED THAT I HAD DIAGNOSED THE PROB INCORRECTLY. IN ADDITION TO WHAT I THOUGHT WAS A MINOR, SHORT DURATION EPR OVERBOOST, WE MUST HAVE EXCEEDED THE ENG LIMITS ON EITHER N1, EGT, OR N2. THE COMPANY TOOK THE PLANE OTS, WE LATER FERRIED THE EMPTY AIRPLANE TO A MAINT STATION. SUPPLEMENTAL INFO FROM ACN 440307: FLT DATA RECORDED WAS REMOVED. ENG CHKS WERE PERFORMED WITH MAINT ON BOARD. ENG RUN-UPS WERE OK AND ACFT WAS FERRIED BACK TO MAINT BASE FOR THOROUGH ENG CHKS AND FLT DATA RECORDER REVIEW. ENGS DID TURN OUT TO BE OVERBOOSTED AND WERE REPLACED.

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.