!! History Commons Alert, Exciting News

Context of '8:56 a.m. September 11, 2001: Flight 77’s Transponder Signal Disappears, yet NEADS Is Not Alerted'

This is a scalable context timeline. It contains events related to the event 8:56 a.m. September 11, 2001: Flight 77’s Transponder Signal Disappears, yet NEADS Is Not Alerted. You can narrow or broaden the context of this timeline by adjusting the zoom level. The lower the scale, the more relevant the items on average will be, while the higher the scale, the less relevant the items, on average, will be.

Bob Varcadipane.Bob Varcadipane. [Source: NBC News]At the air traffic control tower at Newark International Airport in New Jersey, controllers see the smoke coming from the World Trade Center in the distance and start calling other FAA facilities in the area about this. Controller Rick Tepper looks out the window of the tower across the Hudson River at New York City, and sees the huge cloud of smoke coming from the North Tower, which Flight 11 has crashed into it. He points this out to fellow controller Greg Callahan. In his office at the tower, Bob Varcadipane, the supervisor there, starts receiving a flood of phone calls reporting that a small aircraft has hit the WTC. According to author Lynn Spencer, “The assumption is that only a small plane could have gone so badly off course.” The Newark tower controllers start calling the towers at JFK, La Guardia, and Teterboro Airports, along with other air traffic control facilities in the area, to see if any of them has lost an aircraft. But none say they have; they have not yet been informed of the crash and are shocked at what they see when told to look out their windows at the burning WTC. Varcadipane calls the FAA’s New York Center to find out if they know whose plane hit the Twin Towers. He is told: “No, but Boston Center lost an airplane. They lost an American 767.” Varcadipane wonders if this 767 is the plane that hit the WTC, and says back: “I have a burning building and you have a missing airplane. This is very coincidental.” According to NBC: “a horrific realization dawns on controllers. American Flight 11, still missing from radar, finally has been found.” Word of the plane’s fate subsequently “quickly travels throughout the air traffic control world.” [MSNBC, 9/11/2002; Spencer, 2008, pp. 41-42] However, the FAA’s Indianapolis Center, which handles Flight 77, will reportedly not learn of the first hijackings until around 9:20 a.m. (see (9:20 a.m.-9:21 a.m.) September 11, 2001). [9/11 Commission, 8/26/2004, pp. 32]

Entity Tags: Teterboro Airport, World Trade Center, Newark International Airport, Rick Tepper, La Guardia Airport, John F. Kennedy International Airport, Bob Varcadipane, Greg Callahan, New York Air Route Traffic Control Center

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

Flight 77’s transponder is turned off, meaning that the aircraft’s speed, altitude, and flight information are no longer visible on radar displays at the FAA’s Indianapolis Center. [Federal Aviation Administration, 9/17/2001 pdf file; National Transportation Safety Board, 2/19/2002 pdf file; 9/11 Commission, 7/24/2004, pp. 9] The Indianapolis Center air traffic controller in charge of Flight 77 watched the plane go off course and head southwest before its data disappeared from his radar screen. He looks for primary radar signals along the aircraft’s projected flight path as well as in the airspace where it had started to turn, but cannot find it. [9/11 Commission, 6/17/2004] He tries contacting the plane repeatedly, saying “American 77, Indy,” and: “American 77, Indy, radio check. How do you read?” But there is no response. [New York Times, 10/16/2001; New York Times, 10/16/2001]
NEADS Not Contacted - US News and World Report will later comment, “[E]xperts say that an airliner making a 180-degree turn followed by a transponder turnoff should have been a red flag to controllers.” It will quote Robert Cauble, a 20-year veteran of Navy air traffic control, who says: “The fact that the transponder went off, they should have picked up on that immediately. Everyone should have been on alert about what was going on.” [US News and World Report, 10/8/2001] Yet the Indianapolis Center supposedly does not notify NORAD’s Northeast Air Defense Sector (NEADS). According to the 9/11 Commission, NEADS will only learn that Flight 77 is missing at 9:34 a.m. (see 9:34 a.m. September 11, 2001). [9/11 Commission, 7/24/2004, pp. 26-27]
Controller Thinks Plane Suffered Mechanical Failure - While several air traffic control centers were reportedly informed of the Flight 11 hijacking as early as 8:25 a.m. (see 8:25 a.m. September 11, 2001), according to the 9/11 Commission, the controller handling Flight 77 does not realize other aircraft have been hijacked, and he is unaware of the situation in New York. He mistakenly assumes Flight 77 has experienced an electrical or mechanical failure. [Guardian, 10/17/2001; 9/11 Commission, 6/17/2004] After he informs other Indianapolis Center personnel of the developing situation, they will clear all other aircraft from the plane’s westerly route so their safety will not be affected if Flight 77 is still flying along its original path but unable to be heard. [Freni, 2003, pp. 29; 9/11 Commission, 7/24/2004, pp. 460; 9/11 Commission, 8/26/2004, pp. 30]
Airline and Possibly Pentagon Learn of Flight 77 Problems - While NEADS is not alerted about the errant aircraft, a controller at the Indianapolis Center will contact American Airlines at 8:58 to inform it that contact has been lost with Flight 77 (see 8:58 a.m. September 11, 2001). [9/11 Commission, 8/26/2004, pp. 30] And an article in the New York Times will indicate that the Pentagon’s National Military Command Center (NMCC) promptly becomes aware of the problems with Flight 77 (see (Shortly After 8:51 a.m.) September 11, 2001). [New York Times, 9/15/2001]

Entity Tags: Robert Cauble, Indianapolis Air Route Traffic Control Center

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

According to the 9/11 Commission, shortly after 9:00 a.m., Indianapolis flight control begins to notify other government agencies that American 77 is missing and has possibly crashed. For instance, at 9:08 a.m., Indianapolis contacts Air Force Search and Rescue at Langley Air Force Base, Virginia, and tells them to look out for a downed aircraft. It is not clear what Air Force Search and Rescue does with this information. Indianapolis also contacts the West Virginia State Police at about 9:15 a.m., and asks whether they have any reports of a downed aircraft (see Soon After 9:09 a.m. September 11, 2001). However, they apparently do not contact NORAD, but do notify the FAA regional center at 9:09 a.m. (see 9:09 a.m. September 11, 2001). [Federal Aviation Administration, 9/17/2001 pdf file; 9/11 Commission, 6/17/2004]

Entity Tags: North American Aerospace Defense Command, Indianapolis Air Route Traffic Control Center, 9/11 Commission, Langley Air Force Base, Federal Aviation Administration

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

An air traffic controller at the FAA’s Indianapolis Center contacts the American Airlines dispatch office in Texas, and informs dispatcher Jim McDonnell that the center is unable to make contact with Flight 77 and does not know the location of this aircraft. The same controller called American Airlines and spoke with McDonnell four minutes earlier, reporting that radio contact had been lost with Flight 77 (see 8:58 a.m. September 11, 2001). McDonnell now says he has tried contacting Flight 77 but did not get a reply back. The controller then tells him: “We, uh, we lost track control of the guy. He’s in coast track but we haven’t, we don’t [know] where his target is and we can’t get a hold of him. Um, you guys tried him and no response?” McDonnell confirms, “No response.” The controller continues: “Yeah, we have no radar contact and, uh, no communications with him. So if you guys could try again.” McDonnell replies, “We’re doing it.” [New York Times, 10/16/2001; 9/11 Commission, 8/26/2004, pp. 30] Flight 77 made its last radio communication with controllers at 8:51 (see 8:51 a.m. September 11, 2001), and deviated from its assigned course at 8:54 (see (8:54 a.m.) September 11, 2001). [9/11 Commission, 7/24/2004, pp. 8-9]

Entity Tags: American Airlines, Indianapolis Air Route Traffic Control Center, Jim McDonnell

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

After the second World Trade Center crash at 9:03 a.m., air traffic controllers at the FAA’s New York Center are told by their supervisors to watch for airplanes whose speed indicates that they are jets, but which either are not responding to commands or have disabled their transponders. Controllers in Washington receive a similar briefing, which will help them pick out hijacked planes more quickly. [New York Times, 9/13/2001] Whether controllers at other FAA air traffic control centers receive similar instructions at this time is unclear, but those at its Indianapolis Center, which is handling Flight 77, are apparently not informed by their supervisors of the unfolding crisis. [9/11 Commission, 6/17/2004; Spencer, 2008, pp. 105-107]

Entity Tags: Indianapolis Air Route Traffic Control Center, New York Air Route Traffic Control Center, Washington Air Route Traffic Control Center

Timeline Tags: Complete 911 Timeline, 9/11 Timeline

Ordering 

Time period


Email Updates

Receive weekly email updates summarizing what contributors have added to the History Commons database

 
Donate

Developing and maintaining this site is very labor intensive. If you find it useful, please give us a hand and donate what you can.
Donate Now

Volunteer

If you would like to help us with this effort, please contact us. We need help with programming (Java, JDO, mysql, and xml), design, networking, and publicity. If you want to contribute information to this site, click the register link at the top of the page, and start contributing.
Contact Us

Creative Commons License Except where otherwise noted, the textual content of each timeline is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike