Incident Overview
An instructor pilot (INST PLT) and a student pilot were conducting airwork procedures practice in a local area when the instructor observed that the right wing seemed heavy. To address this, he switched the fuel selector from the BOTH position to the RIGHT TANK position.
Return and Approach
After approximately 20–30 minutes of practice, the crew returned to the airport and entered the downwind leg for landing. The student performed a before-landing check. While on final approach, the aircraft was noted to be below the desired flight path. An attempt to add power was made, but there was no response.
Engine Restart Attempt
A restart procedure was attempted; however, it was not successful. The aircraft subsequently collided with trees short of the airport.
Fuel Selector Condition
During the before-landing check, the student had moved the fuel selector to the BOTH position. The selector was binding when moved from the right tank position toward the left and both positions.
Pilot Understanding
An interview with the student pilot revealed that he did not understand the use of the tank selector detents at various selector positions. Additionally, the fuel selector reportedly was not moved during the attempted restart procedures.