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(6:30 a.m.-12:00 p.m.) September 11, 2001: Radar Located in Northeast US Offline for Repair Work

The Joint Surveillance System (JSS).The Joint Surveillance System (JSS). [Source: Dr. Steven R. Bussolari, MIT Lincoln Laboratory]Military radar in Massachusetts, which is used by NORAD’s Northeast Air Defense Sector (NEADS), is out of use this morning in order to undergo maintenance work. [9/11 Commission, 10/27/2003 pdf file; 9/11 Commission, 10/27/2003 pdf file]
Radar Scheduled to Go Down - The J53 radar in North Truro, Massachusetts, is one of a number of radar sites that NEADS receives data from. [United States Space Command, 12/30/1995; Jane's C4I Systems, 9/1/2005; North American Aerospace Defense Command, 10/23/2006 pdf file] It has a range of 250 miles. According to Technical Sergeant Jeffrey Richmond, the assistant air surveillance technician at NEADS, J53 is scheduled to go down this morning for some major repairs to be carried out. [9/11 Commission, 10/27/2003 pdf file; 9/11 Commission, 10/27/2003 pdf file]
NEADS Personnel Refer to Radar - A member of staff at NEADS apparently refers to the J53 radar being offline shortly after those on the NEADS operations floor learn of the Flight 11 hijacking (see (8:38 a.m.) September 11, 2001) and while they are trying to locate the hijacked aircraft. She mentions that NEADS technicians “still should be able to get it” (presumably referring to the plane’s radar track) “without 53.” [North American Aerospace Defense Command, 9/11/2001] (According to Richmond, the area covered by J53 is overlapped by other radars, “so the need for radar to undergo routine maintenance is accounted for.”) ID technician Shelley Watson will later recall that the NEADS ID desk uses the J53 radar as a point from which it attempts to locate Flight 11. At some time during the morning, Richmond insists that J53 be put back online at some capacity. Whether this happens is unstated. [9/11 Commission, 10/27/2003 pdf file; 9/11 Commission, 10/27/2003 pdf file]
Radar Part of 'Joint Surveillance System' - The J53 radar site is part of the Joint Surveillance System (JSS). [Transportation Safety Board of Canada, 9/2/1998; US Department of the Air Force, 11/1/1999 pdf file; 9/11 Commission, 2004] The JSS consists of “long-range radar sites around the perimeter of the US, with data shared by the [Department of Defense], FAA, Customs, and others.” A 2003 Department of Defense report will state that, at the time of the 9/11 attacks, US air defense relies “largely on outward looking ground-based radars, specifically, the Joint Surveillance System.” [US Department of Defense, 7/2003 pdf file] According to General Ralph Eberhart, the commander of NORAD, NORAD has access to the JSS, “which is that system that rings the United States and looks out.” He will say this system “looks for that foreign threat. It looks for someone coming into our airspace that’s not authorized.” [US Congress. Senate, 10/25/2001]

Entity Tags: Joint Surveillance System, Northeast Air Defense Sector, Jeffrey Richmond, Ralph Eberhart, Shelley Watson

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

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