Narrative:

I was departing the runway with a student for training purposes. The preflight and run up of the aircraft checked out fine, indicating no problems. After takeoff while turning crosswind there was a sudden power loss and the engine operation became very rough. I immediately applied carburetor heat and turned inbound for the runway. I did not deem that it was safe to try to continue the traffic pattern at the present altitude and engine condition. I declared engine problems and an emergency landing to ATC. While I turned inbound I was cleared to land on any available surface. I made the landing on 19L, the same runway I departed. The engine ran poorly after landing also. I proceeded to the run up area and did another thorough run up. The roughness smoothes out. After everything checked out, I departed the airport and went to the practice area. The aircraft ran fine after the one incident. After some maneuvers and several takeoffs and lndgs, I brought the aircraft back in and landed it. The tower called and wanted me to contact them by phone after shutdown. After shutdown I called the tower and was told to contact a person at FSDO. I turn I called him and gave a description of the situation. The mechanic at the company that I work for and I determined that the problem was that the engine had gotten some water in its system causing the initial power loss. No water contamination had shown during the preflight, though. I deem that I acted accordingly and promptly to the situation, west/O putting any person or properly or the aircraft in danger. I departed 1R and made the emergency landing on 19L at the fairbanks international airport.

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Original NASA ASRS Text

Title: ACFT EXPERIENCED A ROUGH RUNNING ENGINE AND SOME POWER LOSS IMMEDIATELY AFTER TKOF. REPORTER IMMEDIATELY RETURNED TO THE DEP ARPT AND LANDED.

Narrative: I WAS DEPARTING THE RWY WITH A STUDENT FOR TRNING PURPOSES. THE PREFLT AND RUN UP OF THE ACFT CHKED OUT FINE, INDICATING NO PROBS. AFTER TKOF WHILE TURNING XWIND THERE WAS A SUDDEN PWR LOSS AND THE ENG OPERATION BECAME VERY ROUGH. I IMMEDIATELY APPLIED CARB HEAT AND TURNED INBND FOR THE RWY. I DID NOT DEEM THAT IT WAS SAFE TO TRY TO CONTINUE THE TFC PATTERN AT THE PRESENT ALT AND ENG CONDITION. I DECLARED ENG PROBS AND AN EMER LNDG TO ATC. WHILE I TURNED INBND I WAS CLRED TO LAND ON ANY AVAILABLE SURFACE. I MADE THE LNDG ON 19L, THE SAME RWY I DEPARTED. THE ENG RAN POORLY AFTER LNDG ALSO. I PROCEEDED TO THE RUN UP AREA AND DID ANOTHER THOROUGH RUN UP. THE ROUGHNESS SMOOTHES OUT. AFTER EVERYTHING CHKED OUT, I DEPARTED THE ARPT AND WENT TO THE PRACTICE AREA. THE ACFT RAN FINE AFTER THE ONE INCIDENT. AFTER SOME MANEUVERS AND SEVERAL TKOFS AND LNDGS, I BROUGHT THE ACFT BACK IN AND LANDED IT. THE TWR CALLED AND WANTED ME TO CONTACT THEM BY PHONE AFTER SHUTDOWN. AFTER SHUTDOWN I CALLED THE TWR AND WAS TOLD TO CONTACT A PERSON AT FSDO. I TURN I CALLED HIM AND GAVE A DESCRIPTION OF THE SITUATION. THE MECH AT THE COMPANY THAT I WORK FOR AND I DETERMINED THAT THE PROB WAS THAT THE ENG HAD GOTTEN SOME WATER IN ITS SYS CAUSING THE INITIAL PWR LOSS. NO WATER CONTAMINATION HAD SHOWN DURING THE PREFLT, THOUGH. I DEEM THAT I ACTED ACCORDINGLY AND PROMPTLY TO THE SITUATION, W/O PUTTING ANY PERSON OR PROPERLY OR THE ACFT IN DANGER. I DEPARTED 1R AND MADE THE EMER LNDG ON 19L AT THE FAIRBANKS INTL ARPT.

Data retrieved from NASA's ASRS site as of August 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.