Incident Overview
On 8 May 2018, a pilot holding a Private Pilot License (PPL(A)) was conducting glider towing operations using a Socata Rallye 235 C aircraft at Lisie Kąty airfield. The glider tow commenced from runway 13 at approximately 14:20 LMT. This was the pilot's first flight of the day following a change of towing pilots.
Flight and Engine Failure
The takeoff and initial climb proceeded without issues. During the continued climb, after passing 400 ft altitude, the pilot retracted the flaps, reduced the charge, increased propeller pitch, and switched off the fuel pump. Several seconds later, at about 500 ft, the engine shut down. The pilot maintained airspeed and directed the aircraft toward a field ahead for an emergency landing. He activated the electric fuel pump and the starter, while simultaneously broadcasting a radio message about the engine failure. Upon hearing the message, the glider pilot released the towrope and performed a downwind return to the airfield, landing safely.
Engine Restart and Landing
After the first unsuccessful attempt to restart the engine, the pilot switched the fuel valve to the right tank and tried again; this time the engine started successfully. After verifying engine parameters, the pilot leveled off, then initiated a climb and turned toward the airfield. He performed a safe landing on runway 31. During the post-landing taxi, the pilot checked the fuel levels and discovered that the left tank—the one used for the takeoff—was empty.
Cause
The investigation determined that the incident was caused by pilot error consisting of improper pre-flight inspection.
Preventive Actions
1. The event was discussed with the involved pilot, other towing pilots, and instructors training for glider towing endorsements. 2. The incident will be discussed during the annual flight safety conference.