Narrative:

On a training altitude that began and ended at pdk airport, my student and I experienced engine power loss on the takeoff climb from one of the parallel runways, runway 20R. Prior to takeoff, the manufacturers engine run-up/check was accomplished with normal indications. On takeoff roll, engine indications also were normal. During the climb I was monitoring my students progress on maintaining runway heading. As we were over a shopping center that is located across a street from the end of the runway, the engine suddenly lost power. I estimate our altitude at 350 flight AGL. Taking the controls, I put the aircraft into a steep descending left turn toward the nearest runway - 2R. With my left hand on the throttle, I found that the engine would continue to run at idle position. Also by þpumpingþ the throttle the engine would give a short burst of power, although maintaining altitude was impossible. I rolled out lined up with runway 2R and checked traffic. One aircraft was taking off the runway I just departed - 20R. Another was set for takeoff on 20L, the runway I was returning to. I decided to land 2R instead of the grass knowing I could easily roll out of the way if traffic approached. Which it did not. I exited the runway and received permission to taxi, the aircraft taxied slowly by þpumpingþ the throttle. The only time I contacted the tower in flight was after I had the field made, when I informed them the intent to land 2R. The control tower was using 2 frequencys for controller, one for each parallel. I did not attempt to switch frequencys, nor did I have time to give detailed information to the controller. No loss of fuel pressure was noted. Boost pump was on. Carburetor heat was applied with no affect. The aircraft was an small aircraft engine time 1123 hours. Probable cause of power loss was attributed to engine-driven fuel pump malfunction. Total pump time 3000 hours. Pump was replaced and no further problems noted.

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Original NASA ASRS Text

Title: INSTRUCTOR WITH STUDENT IN CLB AFTER TKOF HAD PWR LOSS. INSTRUCTOR TOOK CTLS MADE A L DSNDING TURN BACK TO ARPT AND LANDED SUCCESSFULLY WITH PARTIAL PWR ON ACFT. ENOUGH TO TAXI.

Narrative: ON A TRAINING ALT THAT BEGAN AND ENDED AT PDK ARPT, MY STUDENT AND I EXPERIENCED ENG PWR LOSS ON THE TKOF CLB FROM ONE OF THE PARALLEL RWYS, RWY 20R. PRIOR TO TKOF, THE MANUFACTURERS ENG RUN-UP/CHK WAS ACCOMPLISHED WITH NORMAL INDICATIONS. ON TKOF ROLL, ENG INDICATIONS ALSO WERE NORMAL. DURING THE CLB I WAS MONITORING MY STUDENTS PROGRESS ON MAINTAINING RWY HDG. AS WE WERE OVER A SHOPPING CTR THAT IS LOCATED ACROSS A STREET FROM THE END OF THE RWY, THE ENG SUDDENLY LOST PWR. I ESTIMATE OUR ALT AT 350 FLT AGL. TAKING THE CTLS, I PUT THE ACFT INTO A STEEP DSNDING L TURN TOWARD THE NEAREST RWY - 2R. WITH MY L HAND ON THE THROTTLE, I FOUND THAT THE ENG WOULD CONTINUE TO RUN AT IDLE POS. ALSO BY þPUMPINGþ THE THROTTLE THE ENG WOULD GIVE A SHORT BURST OF PWR, ALTHOUGH MAINTAINING ALT WAS IMPOSSIBLE. I ROLLED OUT LINED UP WITH RWY 2R AND CHKED TFC. ONE ACFT WAS TAKING OFF THE RWY I JUST DEPARTED - 20R. ANOTHER WAS SET FOR TKOF ON 20L, THE RWY I WAS RETURNING TO. I DECIDED TO LAND 2R INSTEAD OF THE GRASS KNOWING I COULD EASILY ROLL OUT OF THE WAY IF TFC APCHED. WHICH IT DID NOT. I EXITED THE RWY AND RECEIVED PERMISSION TO TAXI, THE ACFT TAXIED SLOWLY BY þPUMPINGþ THE THROTTLE. THE ONLY TIME I CONTACTED THE TWR IN FLT WAS AFTER I HAD THE FIELD MADE, WHEN I INFORMED THEM THE INTENT TO LAND 2R. THE CTL TWR WAS USING 2 FREQS FOR CTLR, ONE FOR EACH PARALLEL. I DID NOT ATTEMPT TO SWITCH FREQS, NOR DID I HAVE TIME TO GIVE DETAILED INFO TO THE CTLR. NO LOSS OF FUEL PRESSURE WAS NOTED. BOOST PUMP WAS ON. CARB HEAT WAS APPLIED WITH NO AFFECT. THE ACFT WAS AN SMA ENG TIME 1123 HRS. PROBABLE CAUSE OF PWR LOSS WAS ATTRIBUTED TO ENG-DRIVEN FUEL PUMP MALFUNCTION. TOTAL PUMP TIME 3000 HRS. PUMP WAS REPLACED AND NO FURTHER PROBLEMS NOTED.

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.