What happened
On August 11, 2019, at approximately 13:22 LMT, a pilot operating a Robin DR 400RP departed from Rzeszów-Jasionka Airport (EPZR) for the purpose of towing a glider. During the flight, while at an altitude of approximately 1,200 feet, the pilot was in the process of releasing the glider when they observed a drop in oil pressure accompanied by irregular engine operation. Recognizing the developing engine issue, the pilot immediately decided to perform an emergency landing.
Following the landing, the pilot taxied the aircraft off the runway and shut down the engine. A subsequent inspection of the aircraft revealed a fracture in the oil installation line, specifically the component connecting the oil pump to the pressure sensor. This fracture resulted in a near-total loss of engine oil.
The investigation
The investigation focused on the mechanical failure of the oil system and the subsequent engine damage. Upon removal, the engine was sent to a certified facility for detailed damage assessment and repair. The technical inspection of the engine revealed evidence of wear, specifically traces of tin alloy abrasion on the crankshaft bearings. As a result, the bearings were replaced with new components, though no other damage was identified in the engine assembly.
Findings
- The primary cause of the incident was the fracture of the oil installation line.
- The failure of the rigid oil line led to a rapid loss of oil pressure and subsequent engine instability.
- The engine sustained internal damage to the crankshaft bearings due to the loss of lubrication.