What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) During training flight, engine RPM would not reduce below approximately 1300 RPM. Instructor attempted to land aircraft, but could not reduce airspeed sufficiently due to high engine RPM. Instructor performed a go-around and engine made full power. During a 2nd go-around attempt, throttle was advanced to full power setting, but engine failed to accelerate. Aircraft hit a fence beyond the end of the runway, cleared the fence, and came to rest in a field just east of state st. the aircraft was substantially damaged. During a post-accident ground run, it was found that the engine would not idle below 1300 RPM or accelerated past 1800 RPM (throttle/mixture control rigging checked good). A compression test was performed and #3 cylinder was found to be 44/80 PSI, primarily leaking through the piston rings. When the carburetor was removed, it was found that the accelerator pump discharge nozzle (tube) was missing from the carburetor air inlet. This tube is pressed-fit into the inlet casting during assembly a second carburetor was installed and the engine ran at the proper idle and full power RPM. It is assumed that the nozzle was ingested by the engine. A malfunction or defect report was submitted by this inspector.
As the FAA filed it
(-23) DURING TRAINING FLIGHT, ENGINE RPM WOULD NOT REDUCE BELOW APPROXIMATELY 1300 RPM. INSTRUCTOR ATTEMPTED TO LAND AIRCRAFT, BUT COULD NOT REDUCE AIRSPEED SUFFICIENTLY DUE TO HIGH ENGINE RPM. INSTRUCTOR PERFORMED A GO-AROUND AND ENGINE MADE FULL POWER. DURING A 2ND GO-AROUND ATTEMPT, THROTTLE WAS ADVANCED TO FULL POWER SETTING, BUT ENGINE FAILED TO ACCELERATE. AIRCRAFT HIT A FENCE BEYOND THE END OF THE RUNWAY, CLEARED THE FENCE, AND CAME TO REST IN A FIELD JUST EAST OF STATE ST. THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED. DURING A POST-ACCIDENT GROUND RUN, IT WAS FOUND THAT THE ENGINE WOULD NOT IDLE BELOW 1300 RPM OR ACCELERATED PAST 1800 RPM (THROTTLE/MIXTURE CONTROL RIGGING CHECKED GOOD). A COMPRESSION TEST WAS PERFORMED AND #3 CYLINDER WAS FOUND TO BE 44/80 PSI, PRIMARILY LEAKING THROUGH THE PISTON RINGS. WHEN THE CARBURETOR WAS REMOVED, IT WAS FOUND THAT THE ACCELERATOR PUMP DISCHARGE NOZZLE (TUBE) WAS MISSING FROM THE CARBURETOR AIR INLET. THIS TUBE IS PRESSED-FIT INTO THE INLET CASTING DURING ASSEMBLY A SECOND CARBURETOR WAS INSTALLED AND THE ENGINE RAN AT THE PROPER IDLE AND FULL POWER RPM. IT IS ASSUMED THAT THE NOZZLE WAS INGESTED BY THE ENGINE. A MALFUNCTION OR DEFECT REPORT WAS SUBMITTED BY THIS INSPECTOR.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.