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8:58:39 when the Backup Flight Software monitor began displaying fault messages for a loss of pressure in the tires of the left landing gear. The pilot and commander then received indications that the status of the left landing gear was unknown, as different sensors reported the gear was down and locked or in the stowed position.[14]: 1.13 The drag of the left wing continued to yaw the orbiter to the left until it could no longer be corrected using aileron trim. The orbiter's Reaction Control System (RCS) thrusters began firing continuously to correct its orientation.[14]: 1.14 The loss of signal (LOS) from Columbia occurred at 8:59:32. Mission control stopped receiving information from the orbiter at this time, and Husband's last radio call of "Roger, uh ..." was cut off mid-transmission.[5]: 39 [14]: 1.14 One of the channels in the flight control software was bypassed as the result of a failed wire, and a Master Alarm began sounding on the flight deck.[14]: 1.15 Loss of control of the orbiter is estimated to have begun several seconds later with a loss of hydraulic pressure and an uncontrolled pitch-up maneuver.[14]: 1.16 The orbiter began flying along a ballistic trajectory, which was significantly steeper and had more drag than the previous gliding trajectory.[14]: 1.17 The orbiter, while still traveling faster than Mach 15, entered into a flat spin of 30° to 40° per second. The acceleration that the crew was experiencing increased from approximately 0.8 g to 3 g, which would have likely caused dizziness and disorientation, but not incapacitation.[14]: 1.18 The autopilot was switched to manual control and reset to automatic mode at 9:00:03; this would have required the input of either Husband or McCool, indicating that they were still conscious and able to perform At 9:00:18 the orbiter began a catastrophic breakup, and all on-board data recording soon ceased.[14]: 1.20 Ground observers noted a sudden increase in debris being shed, and all on-board systems lost p
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