Stephenville Air Station
Part of Pinetree Line
Newfoundland, Canada
640th Aircraft Control and Warning Squadron emblem
Coordinates	48°35′21″N 058°39′58″W / 48.58917°N 58.66611°W / 48.58917; -58.66611 (Stephenville AS N-23)
Type	Radar Station
Code	N-23
Site information
Controlled by	Northeast Air Command Aerospace Defense Command
Site history
Built	1951
Built by	United States Air Force
In use	1951-1971

Stephenville AS

class=notpageimage|

Location of Stephenville AS

Stephenville Air Station (ADC ID: N-23) is a closed General Surveillance Radar station. It is located 9.5 kilometres (5.9 mi) north-northwest of Stephenville, Newfoundland and Labrador, Canada.^[1] It was closed in 1971.

The site was established in 1951 as a General Surveillance Radar station, built by the United States Air Force as part of the Pinetree Line of Ground-Control Intercept (GCI) radar sites.

Units:

• 640th Aircraft Control and Warning Squadron

Assignments:

• 64th Air Division (NEAC), 1 September 1951
• 4731st Air Defense Group (ADC), 1 November 1957
• Goose Air Defense Sector, 6 June 1960
• 37th Air Division, 1 April 1966
• 21st Air Division, 31 March 1970 – 30 June 1971

• List of USAF Aerospace Defense Command General Surveillance Radar Stations

 This article incorporates public domain material from the Air Force Historical Research Agency

• A Handbook of Aerospace Defense Organization 1946 - 1980, by Lloyd H. Cornett and Mildred W. Johnson, Office of History, Aerospace Defense Center, Peterson Air Force Base, Colorado
• Winkler, David F. (1997), Searching the skies: the legacy of the United States Cold War defense radar program. Prepared for United States Air Force Headquarters Air Combat Command.