Category 11 Case Directory
Rating: 5  


AVCAT is a special project being conducted by NICAP, with the help and cooperation of the original compiler of AIRCAT, Dr. Richard Haines, and other sources, to create a comprehensive listing of sightings from aircraft with detailed documentation from these sources, including Projects SIGN, GRUDGE & BLUE BOOK.

The Mantell Case
Jan 7, 1948
Fort Knox, Kentucky

1-7 p.m. local time
Duration 6 hrs
United States
Multiple observers, Mantell
No radar contact

Latest update 25 Jan 2020
Fran Ridge:
Air National Guard pilot killed in crash of F-51 during UFO pursuit. Also sighting at Lockburne AFB, Ohio, later same afternoon, UFO maneuvering erratically up and down. This case was re-investigated in 2006 by the NICAP A-Team and there were major new discoveries. The full report in book form and full documentation is produced below. In 2018 Kevin Randle conducted a re-evaluation and concluded the original analysis was correct and the Mantell case was explained. However, Brad Sparks was able to establish the opposite and presented evidence on the oxygen cover-up.

Brad Sparks:
Jan. 7, 1948. Kentucky-Ohio (BBU)
1-7 p.m. (CST). Mantell case. Kentucky ANG pilot Capt Thomas F. Mantell, Jr., was killed in an F-51D fighter crash at about 3:18 p.m. about 4 miles SSW of Franklin, Ky., about 92 miles S from Godman Control Tower, in an attempt to intercept an unidentified object described in one of Mantell’s last radio reports to Godman AAF tower, Ft. Knox, Ky., about 725 ft elevation as “metallic and tremendous in size.” USAF 1st Lt. Orner, Commander, 733-5 Detachment, AACS, tracked unidentified white light with red coloration by weather tracking theodolite from Godman Field hangar at 240° azimuth 8° elevation at 5:35 p.m., which disappeared over the horizon at 250° azimuth 0° elevation. See later sightings at Lockbourne AFB and Clinton County AFB, Ohio (below). Expanded & greatly updated version, including new SKYHOOK map

Fran Ridge:
This August 1995 SIGHTINGS clip has the Mantell family meeting with Larry Tabor (historian), interview of Charles Moore. The February 1996 segment contains the Mantell family meeting with Clinton Blackwell who made comments that he never mentioned in all the interviews 50 years before which sheds doubt on his testimony today. However his original testimony is considered to be accurate.

Detailed reports and documents
Preliminary Analysis (Fran Ridge)
The Mantell Incident: Anatomy of an Investigation (2006-2010 A-Team)
Original Case Directory from 2006 with original doc and report links (A-Team)
Mantell Case Analysis (Brad Sparks)
The Mantell Doubters [Oct. 24, 2012] (Brad Sparks)
reports/reports/480108fortknox_carpenter.htm [End Game Map] (Joel Carpenter)
Mantell_UFO_Sighting_A_Reevaluation.pdf (December 3, 2018; Kevin Randle)
MANTELL_OXYGEN_COVERUP (Sparks_Jan_6_2020.pdf)
YouTube Video: Encounter From Beyond Dawn: The Story of the Thomas Mantell Incident ( July 29, 2017)

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