2016 Sunbird Aviation crash

The flight was a non-scheduled domestic chartered passenger flight from Tekin, West Sepik Province (Sandaun) to Kiunga, Western Province. The flight was under Visual Flight Rules, in which pilots are not allowed to fly if the weather is inclement. The flight was operated by Sunbird Aviation, a small non-scheduled aviation company based in Goroka, with a Britten-Norman BN-2T Turbine Islander, registered as P2 – SBC. The flight was carrying 11 passengers, including 3 children, and an Australian pilot, identified as Benjamin Andre Picard.[8]

The flight took off from Kiunga at 13:56 and later reached Oksapmin. Picard then reported to Kiunga that the flight was on Kiunga's circuit area and began to fly a left circuit to land at Kiunga. The weather in Kiunga, at the time, was in good condition. Picard then configured the aircraft for landing.[8]

As the flight approached Kiunga, it suddenly pitched up in a nearly vertical condition. Due to the vertical motion, the right wing stalled and the aircraft rolled to the right. It then fell rapidly, struck trees and slammed onto the ground. The aircraft impacted at a nearly 90° angle. Due to the force of the impact, the front part was crushed and the tail snapped. 9 people were killed instantly.[9]

Witnesses reported the crash to the airport and subsequently located the crash site. 3 people were extricated alive from the crash site and were transported to Kiunga Hospital. However, they were later pronounced dead on arrival. All 12 passengers and crews on board were killed.[10]

Papua New Guinea AIC sent two investigators to the crash site. Representative from the aircraft's manufacturer Britten-Norman was also invited to join the investigation. Initial examination of the wreckage was hampered due to bad weather condition. The wreckage was left unattended for five days due to inundation around the area. It was later taken to Kiunga on the sixth day.[8]

There were reports that the pilot of the flight, Benjamin Picard, made an emergency call to the authorities in Kiunga. Seconds later, the aircraft pitched vertically and crashed. Investigators dismissed the report. However, investigators later confirmed that the right engine had failed in mid-flight. It happened while the aircraft was approaching Kiunga. Evidences found on the right engine proved that an engine failure had occurred in mid-flight. This causing the propeller to auto feather as it was shutting down, but that the compressor was still spooling down at impact.[8]

Further investigation revealed that the centre of gravity of the aircraft had shifted significantly to the aft centre. As a result, the aircraft pitched up severely when the pilot extended the flaps.[8]

It is usual for aircraft to pitch up when the pilots extended the flaps. The possibility for the aircraft to pitch up is even greater when the pilots extended the flaps for an approach.[8]

The accident flight was aggravated by the fact that the centre of gravity of the aircraft was shifted to the aft. When the pilot extended the flaps, the aircraft pitched up. However, because the centre of gravity was located at the aft, it would be difficult to pitch the nose down. Examination on the wreckage revealed that the flaps, at the time, were fully extended and that Picard, during the stall, had made a full nose down input, to no avail. Investigators added that there was no evidence that the pilot calculated the aircraft loaded balance for the flight. The actual weight and balance of the aircraft could not be conclusively determined.[8]

Investigators later added that recovery from the stall was impossible due to the low height of the aircraft.[8]

The investigation concluded that the right engine failure caused the aircraft to lose its lift force. The improper loading of the cargo aggravated the condition.[8]