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(Shortly After 8:25 a.m.) September 11, 2001: Aviation Communications Company Tries Contacting Flight 11, but without Success

The ARINC San Francisco Communications Center.The ARINC San Francisco Communications Center. [Source: ARINC]ARINC, a company that provides a backup communications capability for airborne flights, tries unsuccessfully to contact the hijacked Flight 11. [American Airlines, 9/11/2001, pp. 26-27; 9/11 Commission, 1/8/2004 pdf file] Peggy Houck, a flight dispatcher at the American Airlines System Operations Control center in Fort Worth, Texas, calls ARINC in San Francisco and says she needs “to get a hold of” Flight 11. Houck says Flight 11 is “ACARS-equipped” but not responding to ACARS messages (see 8:23 a.m.-8:25 a.m. September 11, 2001). [American Airlines, 9/11/2001, pp. 24-25; Federal Bureau of Investigation, 9/11/2001, pp. 5-7] (ACARS is a text messaging system that enables airline personnel to communicate with the pilots of an in-flight aircraft. [Federal Bureau of Investigation, 9/11/2001, pp. 14-17; 9/11 Commission, 8/26/2004, pp. 9] ) The ARINC employee Houck talks to says they will try to contact Flight 11 using ACARS, and then “SELCAL him.” [American Airlines, 9/11/2001, pp. 24-25] (“SELCAL,” short for “selective calling,” is a technique that, by causing a chime to sound in the cockpit of an aircraft, lets the crew know that a ground radio operator wants to communicate with them. [International Virtual Aviation Organisation, 4/2/2006; Aviation Spectrum Resources, Inc., 9/14/2011, pp. 2-1, 4-1 pdf file] ) However, ARINC’s attempts at contacting Flight 11 are unsuccessful. ARINC calls Houck back to let her know this. The ARINC employee says ARINC has “SELCALd” Flight 11 and sent ACARS messages to the plane, but without getting any response. The employee also says that ARINC called the FAA’s Boston Center, which has been handling Flight 11, and asked if it could relay a message to Flight 11, but the Boston Center replied that it “couldn’t at this time.” After Houck says she would like ARINC to keep trying to contact Flight 11, the employee ends the call, telling her, “I’ll advise the operators to keep on trying.” Houck will later recall that by this time, she has received “no messages or other communications from Flight 11, and had received nothing from the crew to indicate any trouble on board.” [American Airlines, 9/11/2001, pp. 26-27; Federal Bureau of Investigation, 9/11/2001, pp. 5-7]

Entity Tags: Peggy Houck, Boston Air Route Traffic Control Center, ARINC

Timeline Tags: Complete 911 Timeline, 9/11 Timeline


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