Saab SF-340A Electrical Incident at EPWA

Incident Overview and Aircraft Details On 10 June 2016, an incident occurred involving a Saab SF-340A aircraft operated by SprintAir SA, based in Warsaw. The event took place at EPWA, with the investigation supervised by Tomasz Makowski and concluded on 9 December 2016. The aircraft was piloted by a professional line pilot, and two individuals on board were reported to have sustained no injuries. ## Sequence of Events During the final approach to landing at 19:58 LMT, the aircraft experienced a master caution signal. The autopilot and FMS disengaged, the right-side EFIS displays went dark, and warning lights for the right main bus and right essential bus illuminated. Indicators powered by the right electrical system ceased to function, and the landing gear position indicator became inoperative. At this point, the aircraft was approximately 7.5 nautical miles from the threshold of runway 33. ## Crew Actions and Resolution The captain decided to abort the approach and perform a low pass over runway 15/33 to visually confirm the landing gear position. At 20:00 LMT, the low pass was completed, and the tower confirmed the gear was extended. At 20:03 LMT, a state of uncertainty was declared at the airport, and the airport fire brigade and medical team were notified. The captain did not declare an emergency. After completing a new ILS approach to runway 33, the aircraft landed safely at 20:22 LMT. The state of uncertainty was lifted at 20:24 LMT. ## Investigation Findings The investigation determined that the incident was caused by the malfunctioning of the Power Distribution Unit (PDU). The faulty device was replaced, and subsequent engine tests confirmed that the fault had been eliminated. No safety recommendations were issued by the commission.