Include partial engine failure as standard in pilot training

Current pilot training protocols primarily focus on responding to complete engine failure. The Dutch Safety Board calls to also routinely include scenarios involving reduced engine performance or partial failure in training. This recommendation follows an accident involving a Diamond DA 50 RG aircraft on 2 September 2023 at Kempen Airport. During the initial climb, the engine’s RPM dropped twice, prompting the pilot to return for a precautionary landing.

The investigation revealed that the engine malfunction was caused by a main bearing failure. As a result, critical engine components overheated and seized up, leading to a total loss of power. Residues of casting sand were found in the oil channels, which may have contributed to the bearing failure. The exact cause could not be determined. Following the accident, the manufacturer adjusted its cleaning procedure for engine parts.

The pilot’s decision to remain within the circuit aligned with current training practices, which focus on complete engine failure. Partial failure, however, is not addressed in training, despite the added complexity it entails. Chris van Dam, Chair of the Safety Board: “We cannot leave it to chance whether a pilot knows what to do. To ensure safety, reduced engine performance or partial failure must become part of standard training protocols.”

On 2 September 2023, a Diamond DA 50 RG aircraft departed from Kempen Airport on a private flight. During the climb, the engine’s RPM dropped twice. The pilot remained within the circuit and turned back. While approaching the runway, the engine lost all power. The pilot attempted to glide to the runway, but due to a high rate of descent at low altitude, the aircraft struck the ground hard just short of the runway. The right wing broke off and the fuel tank ruptured, causing a fire that severely damaged large parts of the aircraft. The pilot, who was the sole occupant, sustained minor injuries and managed to exit the aircraft on his own. Airport emergency services quickly extinguished the fire.