Narrative:

I departed runway 15 after normal preflight and runup. I take careful note of all engine INS because I had a power loss on takeoff in 9/90. This power loss was supposedly caused by 2 defective fuel injectors. The aircraft was repaired at fitchburg colonial airport, fitchburg, ma. The repair time was over 1 month. Tach time at the last power loss was 1256. The tach was now 1278. As soon as I rotated and retracted the gear, engine lost about 25% power. I checked all gauges quickly and retracted flaps. I notified the tower that I had a rough engine. I asked for a return to landing on runway 15. The engine ran smoother and I landed west/O problem. After landing I contacted the tower and gave information to the ground crew. I did not declare an emergency or use the word 'pan, ' as I did not feel the loss of power was continuous. Callback conversation with reporter revealed the following: after that flight the fuel injectors and screens were thoroughly checked. Nothing wrong could be found, and on the day after, the engine was run to full power. Nothing wrong. Reporter flew aircraft 1 1/2 hours and found a fuel pump leak which was repaired. Just last week he was into cruise mode and when leaning the mixture he had a partial power failure. On the ground the engine could only achieve 1300 RPM. Maintenance found #3 cylinder cool. Tore the engine down. Nothing wrong. After 20 hours of troubleshooting and analysis, couldn't find anything. Reporter refuses to fly aircraft until some reason for power losses is found. They have all discounted the logical reasons; i.e., water in the fuel, etc. Reporter wants to call again when problem found, if ever.

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Original NASA ASRS Text

Title: SMA PLT RETURNS LANDS AFTER HIS ENGINE SUFFERS POWER LOSS ON TKOF.

Narrative: I DEPARTED RWY 15 AFTER NORMAL PREFLT AND RUNUP. I TAKE CAREFUL NOTE OF ALL ENG INS BECAUSE I HAD A PWR LOSS ON TKOF IN 9/90. THIS PWR LOSS WAS SUPPOSEDLY CAUSED BY 2 DEFECTIVE FUEL INJECTORS. THE ACFT WAS REPAIRED AT FITCHBURG COLONIAL ARPT, FITCHBURG, MA. THE REPAIR TIME WAS OVER 1 MONTH. TACH TIME AT THE LAST PWR LOSS WAS 1256. THE TACH WAS NOW 1278. AS SOON AS I ROTATED AND RETRACTED THE GEAR, ENG LOST ABOUT 25% PWR. I CHKED ALL GAUGES QUICKLY AND RETRACTED FLAPS. I NOTIFIED THE TWR THAT I HAD A ROUGH ENG. I ASKED FOR A RETURN TO LNDG ON RWY 15. THE ENG RAN SMOOTHER AND I LANDED W/O PROB. AFTER LNDG I CONTACTED THE TWR AND GAVE INFO TO THE GND CREW. I DID NOT DECLARE AN EMER OR USE THE WORD 'PAN, ' AS I DID NOT FEEL THE LOSS OF PWR WAS CONTINUOUS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: AFTER THAT FLT THE FUEL INJECTORS AND SCREENS WERE THOROUGHLY CHKED. NOTHING WRONG COULD BE FOUND, AND ON THE DAY AFTER, THE ENG WAS RUN TO FULL PWR. NOTHING WRONG. RPTR FLEW ACFT 1 1/2 HRS AND FOUND A FUEL PUMP LEAK WHICH WAS REPAIRED. JUST LAST WK HE WAS INTO CRUISE MODE AND WHEN LEANING THE MIXTURE HE HAD A PARTIAL PWR FAILURE. ON THE GND THE ENG COULD ONLY ACHIEVE 1300 RPM. MAINT FOUND #3 CYLINDER COOL. TORE THE ENG DOWN. NOTHING WRONG. AFTER 20 HRS OF TROUBLESHOOTING AND ANALYSIS, COULDN'T FIND ANYTHING. RPTR REFUSES TO FLY ACFT UNTIL SOME REASON FOR PWR LOSSES IS FOUND. THEY HAVE ALL DISCOUNTED THE LOGICAL REASONS; I.E., WATER IN THE FUEL, ETC. RPTR WANTS TO CALL AGAIN WHEN PROB FOUND, IF EVER.

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.