Transocean Air Lines Flight 942 departed Roswell at 12:11 for Oakland. The flight was for the purpose of transporting military personnel. After departing Roswell the flight progressed in a routine manner and at 14:51, when in the vicinity of Winslow, Arizona, the Defense VFR flight plan was changed to IFR, still at least 500 feet on top of clouds. At 18:19 the flight reported over the Newark, California, compass locator and fan marker at 8,000 feet where it held for 11 minutes. At 18:27, Oakland Approach Control cleared Flight 942 for a straight-in range approach, to descend in the holding pattern to cross the Newark compass locator at 3,500 feet and to report leaving each 1,000-foot level. Three minutes later, at 18:30, the flight reported leaving 8,000 feet, and subsequently reported leaving each 1,000-foot level. At 18:36, it reported being at 3,500 feet leaving the Newark compass locator inbound. Almost immediately thereafter the aircraft became uncontrollable. The aircraft descended in a steep right wing low slipping attitude until it crashed in a large flat field near Alvarado, CA. PROBABLE CAUSE: “The loss of control of the aircraft for reasons unknown, during its descent from the Newark compass locator.”