What happened
The pilot reported that engine revolutions per minute (RPM) dropped to idle when he reduced power for the second time while on the downwind leg of the traffic pattern. This reduction was part of the standard procedure in preparation for landing. When the pilot attempted to add power by pushing the throttle forward, the control did not respond as expected. The aircraft touched down short of the runway and came to rest approximately 320 feet from the approach end of the runway.
The investigation
The investigation focused on the mechanical operation of the engine controls following the incident. Despite examining the system, investigators were unable to determine the specific cause of the throttle control malfunction. No definitive mechanical failure or obstruction was identified that could explain why the throttle could not be pushed in during the attempt to add power.
Findings
The primary factor contributing to the outcome was the throttle control malfunction. This mechanical issue prevented the pilot from increasing engine power at a critical phase of flight. The inability to restore power resulted in the aircraft landing short of the intended touchdown zone. The exact reason for the control failure remained undetermined after the investigation.
Safety message
Pilots should be aware that throttle controls can occasionally experience mechanical issues or binding. Regular preflight inspections and monitoring of engine response during power changes are essential to detect potential anomalies early in the flight.