Extra EA300 N19AM accident near Mesa, Arizona

Probable cause

The flight instructor’s operation of the airplane outside of the manufacturer’s limitations, which resulted in fuel starvation and a partial loss of engine power. Contributing to the accident was an inoperative electric fuel boost pump.

NTSB analysis

The flight instructor and student pilot were maneuvering the airplane as part of an upset prevention and recovery training curriculum. The flight instructor reported that the airplane lost partial engine power as he completed a rolling maneuver demonstration. The flight instructor immediately switched the fuel selector valve from the WING tank position to the ACRO/CENTER (acrobatic) fuel tank position; however, he was unable to restore full engine power and subsequently made an off-airport landing during which the airplane sustained substantial damage.

Postaccident onsite examination of the airplane revealed that the acro/center fuel tank contained approximately 13 gallons of avgas. The left-wing tank contained trace amounts of avgas and the right-wing tank contained approximately 6 gallons of avgas. Further examination of the airplane revealed that the electrically driven fuel boost pump, which the flight instructor reported was on during the accident flight, was inoperative. It would be used, in part, for emergencies and inflight restarts following an engine failure. The inoperative boost pump was removed and replaced with a segregate boost pump. The engine was then started and developed continuous power at varied throttle positions between idle to full power.

The flight manual states that aerobatic maneuvers must be accomplished with the fuel selector in the ACRO/CENTER (acrobatic) fuel tank position. The accident sequence is consistent with a partial loss of engine power likely due to an interruption of fuel flow while the flight instructor was performing aerobic maneuvers with the fuel sector in the WING tank position. It is likely that the fuel unported from the wing tanks, which resulted in fuel starvation and a partial loss of engine power. The inoperative electric fuel boost pump contributed to the flight instructor's inability to restart the engine.

Text from the NTSB. Open the NTSB docket for WPR19LA218 for the full record.