August 26, 1951 — Larson AFB, WA
8:28 p.m. A radar station at Larson AFB [now Grant County International Airport], near Moses Lake, Washington, tracks a UFO at 13,000 feet going 950 mph on two different sets, AN/CPS-1 and AN/CPS-4, for about 6 minutes.
An F-86 is scrambled, but radar contact is lost before the plane gets off the ground. An electronic signal is received from this object that appears to be a mode-one IFF response from an AN/APX-6 transponder.
This response is received twice at approximately 115 miles and 80 miles from the radar station. [Eberhart]
Record Card:
AF-112:
Status Report 1:
Sources:
Edward Ruppelt, The Report on Unidentified Flying Objects, pp. 96–98, 108–109;
Brad Sparks, Blue Books Unknowns Catalogue, Case 466, p. 108;
Jerome Clark, The UFO Encyclopedia, 3rd Ed., p. 692;
Jerome Clark, The UFO Encyclopedia, 4th Ed., p. 767;
NICAP, “Two Radars Track 900 MPH Target;
