What happened
On May 30, 2018, a Piper PA-44-180T was performing a takeoff roll at Modlin Airport (EPMO). Shortly after the takeoff roll commenced, the aircraft experienced a sudden rightward yaw and noticeable vibrations throughout the airframe. The pilot responded by aborting the takeoff at a speed of approximately 40 knots. Following the aborted takeoff, the right engine failed, and the aircraft taxied back to its parking position using only the remaining operational engine.
Prior to the incident, no irregularities had been noted regarding the right engine's performance, and all engine parameters were within normal operating limits. There was no fire or visible evidence of mechanical damage following the event. A subsequent inspection of the engine revealed no leaks of fuel or oil, nor any visible mechanical failures.
The investigation
The investigation focused on the fuel system, specifically noting that the electric fuel pump for the right engine had been replaced on May 29, 2018, the day before the incident. Upon inspecting the fuel system and the engines, investigators identified that the fuel system supplying the right engine had become air-bound.
Findings
- The primary cause of the incident was the interruption of fuel flow to the right engine due to air entering the fuel system following the replacement of the electric fuel pump.
Safety action
Following the incident, the operator took several preventive measures:
- The pilot reviewed the causes of the event and the importance of monitoring engine parameters during pre-takeoff engine runs.
- It was established that after performing maintenance, engine runs must include a check of fuel flow stability on the flow meters at takeoff RPM to ensure no air is present in the lines.