What triggered the plunge of K2 flight

EVERYTHING appeared normal until the crew of K2 Airways Flight 1732, a Boeing 737-400 registered as AP-BOI, reported a navigation systems failure at 9:18pm (0418 UTC) on July 7. While operating a ferry flight from Sharjah to Karachi, the crew requ­ested heading guidance from air traffic control. The aircraft had undergone maintenance in Sharjah prior to departure, indicating that maintenance work had been carried out before the ill-fated flight. Three minutes after the initial distress call, ...

By none@none.com (Imran Aslam Khan)