runway 35. The aircraft then suddenly rolled to the right and pitched nose down. The crew tried to initiate a go-around by selecting 15-degree flaps and an increase in thrust. The altitude decreased rapidly and acceleration increased to over 4G until the aircraft crashed into Widefield Park, less than from the runway threshold, at a speed of . The aircraft was destroyed on impact and fire in the crater was fed by the fuel released from the ruptured wing tanks. According to the accident report, the crash carved a crater and deep. Everyone on board was killed instantly. Investigation Initial investigation The National Transportation Safety Board (NTSB) commenced an investigation, which lasted for 21 months. Although the flight data recorder (FDR) outer protective case was damaged, the data tape inside was intact and all of the data were recoverable. Five parameters were recorded by the FDR: heading, altitude, airspeed, normal acceleration (G loads), and microphone keying. The FDR did not record rudder, aileron or spoiler deflection data, which could have aided the NTSB in reconstructing the plane's final moments. The data available proved insufficient to establish why the plane suddenly went into the fatal dive. The NTSB considered the possibilities of a malfunction of the rudder power control unit servo (which might have caused the rudder to reverse) and the effect that powerful rotor winds from the nearby Rocky Mountains may have had, but there was not enough evidence to prove either hypothesis. The cockpit voice recorder (CVR) was also damaged, but the data tape inside was also intact. However, the data tape had creases in it, resulting in the playback quality being poor. The CVR determined that the pilots made a verbal (and possible physical) response to the loss of control. The following is an excerpt of the last two minutes Flight 585 CVR, starting two minutes before impact (the full CVR recording started before Flight 585 took off from Stapleton): Thus, the first NTSB report (issued on December 8, 1992) did not conclude with the usual "probable cause". Instead, it stated: Intervening events Following the failure to identify the cause of Flight 585's crash, another Boeing 737 crash occurred under very similar circumstances when USAir Flight 427 crashed while attempting to land in Pennsylvania in 1994. Renewed investigation and probable cause The NTSB reopened its investigation into Flight 585 in parallel with the USAir Flight 427 investigation, due