STS-109 Commander Scott Altman drives the M-113 armored personnel carrier during emergency egress training at the launch pad. He and other crew members are taking part in Terminal Countdown Demonstration Test activities, which also include a simulated launch countdown. STS-109 is a Hubble Space Telescope Servicing Mission, with goals to replace Solar Array 2 with Solar Array 3, replace the Power Control Unit, remove the Faint Object Camera and install the Advanced Camera for Surveys (ACS), install the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) Cooling System, and install New Outer Blanket Layer insulation. The 11-day mission will require grasping the satellite with a robotic arm in order for the crew to perform the tasks during five spacewalks. Launch of STS-109 aboard Space Shuttle Columbia is scheduled for Feb. 28, 2002