He retired at the rank of squadron leader from PAF in 2003 while accumulating 6,279 hours. He started to fly as first officer in JS Air in June 2006. The captain had accumulated a total flying experience of 8,114 hours, including 1,820 hours on the Beechcraft-1900. The first officer was 33-year-old Noman Shamsi, a Pakistani national born in 1977. He was given multi-engine aircraft rating on Cessna-402 aircraft on 23 December 2004 after completing all requirements/formalities by CAA Pakistan. He joined JS Air and underwent his Beechcraft 1900 ground and simulator training in the United Kingdom in 2006 and successfully accomplished his training. After completing his flying training at JS Air, he was cleared by CAA Pakistan to fly as co-pilot under supervision in February 2007. He became a captain in March 2010. The first officer had accumulated a total flying experience of 1,746 hours, with 1,338 of them on the Beechcraft 1900. Investigation An inquiry was ordered into the crash. No evidence was found of a bird strike, pilot incapacitation, sabotage, in-flight structural failure or fire. The investigation started with the examination on the plane's propellers, as evidence from the cockpit voice recorder (CVR) suggested that an engine failure occurred in mid-flight. Investigators retrieved the propeller from the wreckage and stated that the beta valve in the aircraft may have malfunctioned in mid flight. There are two possibilities of beta valve malfunction: mis-rigging after some maintenance work or fair wear and tear during routine service. Unfortunately, the beta system's integrity and rigging status could not be verified because the propeller governor had been completely consumed in the post ground impact fire. However, it was confirmed from the documented history and the engineering staff that there was neither any reported defect related to the beta system nor was there any scheduled or unscheduled maintenance performed in the recent past. Therefore, the only probable cause of occurrence could be fair wear and tear of the beta valve. However, investigators stated that even if a mid-air engine failure occurred, the pilots still could have returned to the airport safely. If an aircraft had a mid air engine failure in one engine, the plane still could fly. All twin engine aircraft are designed to sustain a safe flight even if one of the engines has failed or is switched off due to any abnormality, provided the emergency handling procedures are correctly followed. Similarly,