LAX86FA160

The flt was receiving radar advisories & was routine until the acft was aprx 15 mi east of the destination arpt. After radar svc was terminated, the acft subsequently turned toward the northwest & flew into rising terrain at an elevation of about 3000 feet. The acft was reported missing, but was not found until 4/1/86. The crash site was located about 10 mi northeast of the arpt. Darkness & marginal wx existed at the crash site at the time of the acdnt. Aprx 18 mi south at ontario, CA, the 1945 wx was, in part: sky partially obscured, 1300 broken, 5000 overcast, visibility 4 mi with haze, wind from 270 deg at 10 KTS. The elevation at ontario was 952 ft.