SAFETY
Collision Emphasizes Visual Limitations
At approximately 1118,1. Jan. 31, 1957, a Douglas-owned-and-operated DC-7B, N 8210H, and a USAF owned-and-Northropoperated F-89J, 52-1870A, collided at 25,000 ft.2 over the San Gabriel Mountains about three miles northwest of Sunland, Calif.