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KENNEDY SPACE CENTER, FLA. - During a Crew Equipment Interface Test (CEIT) in the Orbiter Processing Facility, STS-116 crew members are looking closely at equipment in Discovery’s payload bay. In the white cap is Pilot William Oefelein. Below him is the top of the external air lock. A CEIT allows astronauts to become familiar with equipment and hardware they will use on the mission. STS-116 will be mission No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett