Winslow Air Force Station

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Winslow Air Force Station (1953-1963) - A Cold War Air Force Radar Station first established in 1953 near Winslow, Coconino County, Arizona. Named Winslow Air Force Station after the location. Initially assigned a Permanent ID of M-93, later a Sage ID of Z-93. Abandoned in 1963.

Winslow Air Force Station

History of Winslow Air Force Station

Established in 1953 and became operational in April 1955 as Winslow Air Force Station manned by the 904th AC&W Squadron. The station initially had both a Ground-Control Intercept (GCI) and early warning mission. The early warning mission involved tracking and identifying all aircraft entering their airspace while the GCI mission involved guiding Air Force interceptors to any identified enemy aircraft. Controllers at the station vectored fighter aircraft at the correct course and speed to intercept enemy aircraft using voice commands via ground-to-air radio.

Initial equipment included the FPS-8 search radar.

SAGE Transition

The transition of the manual GCI system to the automated SAGE system began with the installation of the FST-2 coordinate data transmitter and search radar upgrades. The FST-2 equipment digitized the radar returns and transmitted the digital returns to the SAGE direction center. Under the SAGE System, interceptor aircraft were directed to their targets by the direction center computers and controllers, greatly reducing the need for local controllers and equipment at every radar station.

The FST-2 was a very large digital system using vacuum tube technology. Over 6900 vacuum tubes were used in each FST-2 requiring 21 air-conditioned cabinets, 40 tons of air conditioning, 43.5 kva of prime power, and usually a large new addition to the operations building. The FST-2B modification added two more cabinets but with newer solid-state (transistor) technology to process coded responses from aircraft transponders.

The site began operation as a SAGE site on 1 Jan 1960, initially feeding the Norton SAGE Direction Center DC-17. The site radars were upgraded to an MPS-11 search radar and two height-finders, one FPS-6A and one FPS-6B. On 1 may 1961 SAGE control of Winslow AFS was transferred to the Luke SAGE Direction Center DC-21 until 1 Aug 1963 when Winslow AFS was discontinued. A FPS-64 search radar was in the process of acceptance testing when the site closed and was never declared operational.

Gap Fillers

Winslow AFS was responsible for the maintenance of two remote unattended gap-filler radar sites. The unattended gap filler sites were placed in locations where the main search radar lacked coverage. These sites were equipped with short range FPS-14 or FPS-18 search radars and FST-1 Coordinate Data transmitters that sent digitized radar target data to a SAGE direction center and to the main radar site. Both the radar set and the FST-1 were dual channel to increase site up time. Maintenance teams were dispatched for regularly scheduled maintenance or when fault indicators on the FSW-1 remote monitoring equipment suggested the site had problems. The FSW-1 also allowed remote operation of specific functions such as channel changes for the radar and for the FST-1, it also allowed remote operation of the diesel generators at the gap filler site. The Winslow AFS gap-filler radars were located at Mingus Mountain and Hillside, Arizona.

Winslow AFS Gap Filler Radar Sites (edit list)
ADC NORAD Location State Type From To GPS Notes
M-93A Z-93A Mingus Mountain AZ FPS-18, FST-1 1960-09 1961-06 34.70194,
M-93B Z-93B Hillside AZ FPS-1?, FST-1 34.42917,


Winslow AFS and the 904th Radar Squadron were deactivated on 1 Aug 1963.

Physical Plant

The physical plant of the site was divided into the main site, a cantonment area, a housing area and a radio site. The main site housed the operations buildings, the radar towers, and the backup generators. The cantonment area housed the enlisted barracks, the bachelor officer's quarters, the orderly room, the dining hall, the motor pool and other support buildings. Apart from the main site was a small 20 unit housing area for critical married personnel. A separate Ground to Air Transmitter/Receiver (GATR) radio site housed the radio equipment for directing aircraft intercepts.

Winslow AFS Major Equipment List
Search Radar HF Radar Data Systems
Unit Designations
  • 904th Aircraft Control & Warning (AC&W) Squadron (1953-1961)
  • 904th Radar Squadron (SAGE) (1961-1963)
904th Assignments
  • 18 Jun 1953 - Activated at Kirtland AFB, NM, assigned to 34th AD.
  • Spring 1955 - Moved to Winslow AFS, AZ.
  • 1 Jan 1960 - Transferred to LA ADS.
  • 1 May 1961 - Transferred to Phoenix ADS.
  • 15 Oct 1961 - Redesignated from AC&W Sq to 904th Radar Sq (SAGE).
  • 1 Aug 1963 - Discontinued.

Winslow Air Force Station Partial Commanders List (edit list)
Assumed Relieved Rank Name Cullum Notes
~1956 Major Evans, Charles W. N/A

Current Status

The site has been leveled and only the access road remains.

Location: Winslow in Coconino County, Arizona.

Maps & Images

Lat: 35.08028 Long: -110.83361

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: 5,216'

GPS Locations:

See Also:


  • Cornett, Lloyd H. & Johnson, Mildred W., A Handbook of Aerospace Defense Organization (1946-1980), Office of History ADC, Peterson AFB, Colorado, 31 Dec 1980, 179 pages, Pdf, page 172.
  • Winkler, David F., Searching the Skies: the Legacy of the United States Cold War Defense Radar Program, USAF Hq Air Combat Command, 1997, 192 pages, Pdf, page 99.
  • USGS Geographic Names Information System (GNIS) Database Entry: 2090229


Fortification ID:

  • AZ0295 - Winslow Air Force Station

Visited: No

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