![]() ![]() Inside Discover Park America in Exploration area left side park toward the back. Marker is in Union City, Tennessee, in Obion County. A significant historical year for this entry is 1965. This historical marker is listed in these topic lists: Air & Space The JEL system is being upgraded to increase how much weight the crawlers can carry from the previous 12 million pounds to the needed 18 million pounds. CT-1 is being strengthened to carry commercially operated launch vehicles, while CT-2 is being modified to support NASA's Space Launch System (SLS) and the Orion spacecraft. NASA's Ground System Development and Operations Program (GSDO) has been refurbishing the crawlers since the last space shuttle launch in 2011. The largest vehicle ever built, Crawler-transport 1 (CT-1) and 2 (CT-2) were constructed in 1965 and used during the Apollo, Skylab, Apollo-Soyuz, and Space Shuttle programs. The JEL system is being upgraded to increase how much weight the crawlers can carry from the previous 12 million pounds to the needed 18 million pounds.Ĭrawler-transporters are gigantic machines used to transport rockets and spacecraft from the Vehicle Assembly Building (VAB) to Launch Complex 39 at NASA's Kennedy Space Center in Florida. ![]() The jacking, equalizing, and leveling (JEL) system keeps the upper deck and pickup points level at all times, even when traveling at an incline, to prevent the payload from toppling. One crawler houses 16 traction motors, two AC and two DC generators, and two control cabs that drive the vehicle forward and backward. Each transporter travels on eight tracked tread belts containing 57 tread belt "shoes." After the launch, the crawler re-lifts the mobile launcher and returns it. Traveling 1 mph, the crawler carries the launch vehicle with its mobile launcher platform to the launch pad using a laser guidance system and lowers them both onto the pad pedestals. Crawler-transporters are gigantic machines used to transport rockets and spacecraft from the Vehicle Assembly Building (VAB) to Launch Complex 39 at NASA's Kennedy Space Center in Florida. ![]()
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