Internal pressure in the right-side booster is recorded as 11.8 pounds per square inch higher than normal. The backup flight system computer aboard Challenger commands the S-band PM (phase modulated) and S-band FM radio systems to switch antennas to maintain communications during the upcoming roll maneuver. These are normal and are caused by flame and objects on the horizon that attenuate radio signals. Four more "data BIT-synch dropouts" occur in the next one minute and six seconds. Loss of data from the shuttle at NASA's Merritt Island antenna complex for four data frames. Algate, mission control, Houston: "Liftoff confirmed."įlight director Jay Greene, Houston: "Liftoff."
The three liquid-fueled main engines throttle up from 90 percent thrust to 104 percent thrust as planned.ĭata processing systems (DPS) engineer A.F. Liftoff of the 25th space shuttle mission, and it has cleared the tower."
Launch commentator Hugh Harris, NASA-SELECT television: ". Last positive visual indication of smoke swirling under the bottom of the external fuel tank. The aft attach fitting is a little less than two feet above the fuel segment joint. Last positive evidence of smoke above the aft attach fitting that holds the rear of the right-side booster to the external fuel tank. Shuttle pilot Michael Smith, intercom: "Here we go." Ground launch sequence computers begin post-liftoff "safing" of launch pad structures and equipment. The black smoke appears darkest jets in puffs of three per second, roughly matching harmonic characteristics of the shuttle vehicle at launch. Telemetry and photo timing was generated by NASA for the RogersĬommission, the presidential panel that investigated the mishap.Īstronaut Judy Resnik, intercom: "Aaall Riight!"įirst of eight 25-inch-long, 7-inch-wide exploding bolts fire, four at the base of each booster, freeing Challenger from launch pad.įirst continuous vertical motion is recorded.įilm developed later shows the first evidence of abnormal black smoke appearing slightly above the suspect O-ring joint in Challenger's right-hand solid rocket booster. Transcript was provided by NASA rounded to the nearest second. NASA-Select and mission control audio circuits is based on stopwatchĪnalysis and as such is somewhat subjective. While every effort was made to ensure accuracy, the timing of the Public and a transcript of crew cabin intercom conversations released Johnson Space Center, the NASA-Select audio circuit heard by the Recordings of the flight director's loop in mission control at the The timeline merges telemetry beamed down from the shuttle, NASA In the authors' spare time as an internal reference. The following timeline was assembled in the wake of the Challengerĭisaster by William Harwood, United Press International's CapeĬanaveral bureau chief at the time of the accident, and Rob Navias,Īt that time UPI radio's chief space correspondent. Spaceflight Now | The Challenger Accident | Timeline
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