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An MLP being carried by a Crawler-Transporter.
The Mobile Launcher Platform or MLP is a two-story structure used by NASA, along with the Crawler-Transporter, to transport the Space Shuttle stack from the Vehicle Assembly Building (VAB) to either Launch Pad 39-A or 39-B at the Kennedy Space Center, as well as serve as the vehicle's launch platform. NASA's three MLPs were originally constructed for the Apollo Program to launch the Saturn V rockets in the 1960s and 1970s, and have remained in service to this day, with substantial alterations.
Contents
1 Function
2 Evolution
2.1 Apollo
2.2 Space Shuttle Program
2.3 Project Constellation
3 References
4 External links
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Function
Each MLP weighs 9.25 million pounds (4200 t) and measures 160feet (49m) by 135feet (41m), and is 25feet (7.6m) high.
Originally designated the "Mobile Launcher"[1], the MLP was designed as part of NASA's strategy for vertical assembly and transport of space vehicles. Vertical assembly allows the preparation of the spacecraft in a ready-for-launch position, and avoids the additional step of lifting or craning a horizontally-assembled vehicle onto the launchpad (as the engineers of the Soviet space program chose to do).
The Mobile Launcher Platform is set atop 6 legs inside the massive Vehicle Assembly building. The Solid Rocket Boosters are mounted on top of the MLP. The External Tank is then lowered between the 2 boosters and attached to them. After that, the Orbiter is lowered into position and attached to the External Tank. The Crawler-Transporter then carries the combined platform and vehicle to the launch site, and deposits them there together. Once the launch has been completed, the Crawler-Transporter retrieves the empty MLP from the pad to be readied for its next use.
Evolution
The Saturn V "stack" for the Apollo 11 moon landing mission moves up the ramp toward its launch site on the Mobile Launcher, carried by the Crawler-Transporter.
Apollo
The MLP was originally constructed for the use of transporting and launching the Saturn V rocket for the Apollo program lunar landing missions of the 1960s and 1970s. Each MLP originally had a single exhaust vent for the Saturn V's motors. The MLPs also featured the distinctive 400-foot (120m) launch umbilical tower with arms that permitted the servicing of the rocket on the launch pad. The arms swung away from the Saturn V at launch. For Skylab and Apollo-Soyuz, MLP #1 was modified with a so-called "milkstool" pedestal that allowed the shorter Saturn IB rocket to use the Saturn V tower and service arms, and Saturn V Ground Support Equipment (GSE) was removed or de-activated and Saturn IB GSE equipment was installed.
Space Shuttle Program
In the post-Apollo years, the umbilical towers from Mobile Launchers 2 and 3 were removed. Portions of these tower structures were erected at the two Space Shuttle (or STS, for Space Transport System) launch pads, Pads 39 A and B. These permanent structures are now known as the "Fixed Service Structure" or in NASA's language of acronyms, FSS. The umbilical tower from Mobile Launcher 1 (which was the platform used for the most significant Apollo Missions) was taken apart and stored in the Kennedy Space Center's industrial area.
In addition to removal of the umbilical towers, each Shuttle-era MLP was extensively reconfigured with the addition of two Tail Service Masts, one on either side of the Main Engine exhaust vent. These 31-foot (9.4m) masts contain the feed lines through which liquid hydrogen (LH2) and liquid oxygen (LOX) are loaded into the shuttle's external fuel tank, as well as electrical hookups and flares that are used to burn off any ambient hydrogen vapors at the launch site immediately prior to Main Engine start.
The Space Shuttle Main Engine (SSME) vents its exhaust through the original opening used for the Saturn rocket exhaust. Two additional holes were added to vent exhaust from the Solid Rocket Boosters that flank the external fuel tank.
Water is released onto the mobile launcher platform on Launch Pad 39A at the start of a rare sound suppression system test in 2004. During launch, 300,000 gallons (1136 m3) are poured onto the pad in only 41 seconds.
The Space Shuttle assembly is held to the MLP through the use of eight attach posts, also called "hold-down bolts", four on the aft skirt of each Solid Rocket Booster. Immediately before SRB ignition, frangible nuts attached to the top of these bolts are detonated, releasing the assembly from the platform.
When NASA began launching shuttle missions, it became clear that the MLP might inadvertently pose a danger to the crew or the vehicle: massive acoustic shock waves and rocket exhaust can bounce off the platform and hit the shuttle as it lifts off. This was true for the Saturn V launches as well, but...(and so on)
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