Workers construct tiers for the crew access tower that will be assembled at SLC-41 for the CST-100 flights.
Workers assemble two tiers of a crew access tower destined for Space Launch Complex 41 at Cape Canaveral Air Force Station. The tiers are being built in a yard a few miles from the launch pad and will be integrated at the launch site later so as not to interfere with operational launches. Once assembled, the crew access tower will stand about 200 feet and is designed to provide safe access to Boeing’s CST-100 spacecraft as it stands on the pad atop a United Launch Alliance Atlas V rocket. Photo credit: NASA/Jim Grossmann