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Forum:Commercial Space - Military Space
Topic:ULA: Complex 41 commercial crew modifications
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Robert PearlmanBoeing photo release
CST-100 Tiers 1 and 2 will be complete this week and stacked by the end of the summer before installation on Complex 41.
daboltonSo they are going to stack the tier 1 and 2 and move it to complex 41 as a whole?
Robert PearlmanYes, and those are only the first two tiers. Five more will be assembled, stacked and then moved to LC-41 to be stacked atop the other tiers.
Boeing and ULA designed the metal latticework structure to be modular such that large sections of the tower will be constructed away from the pad and then trucked in and stacked, allowing assembly to be completed between on-going Atlas V unmanned launches. It is expected to take about 18 months to erect the structure.
Robert PearlmanBoeing's Chris Ferguson on Twitter:
Good times roll... a big, and completely different payload rolls to the Atlas V pad... Commercial Crew access tower.
Jim Behling
Originally posted by dabolton:
So they are going to stack the tier 1 and 2 and move it to complex 41 as a whole?
They will stack each tier separately at the pad.
Robert PearlmanNASA release
Crew Access Tower Stacking Begins

The first new Crew Access Tower at Cape Canaveral Air Force Station in Florida since the Apollo era will take shape at Space Launch Complex-41 in the coming days as workers moved the first two tiers from a nearby construction yard to the pad surface. The tiers will be lifted into place atop each other at the foot of the launch pad starting next week.

Boeing and United Launch Alliance are building the tower which is a critical element for the launch pad as it is converted from a pad that serves only uncrewed missions to a complex that can safely accommodate the needs of flight crews along with their ground support teams for CST-100 Starliner missions. The Starliner is under development in partnership with NASA's Commercial Crew Program, along with the SpaceX Crew Dragon, to take astronauts to the International Space Station from Florida's Space Coast.

Designed with modern data systems, communications and power networks integrated and protected from blast and vibration, plus an elevator, the Crew Access Tower has been built with several features only a fully suited astronaut could appreciate, such as wider walkways, snag-free railings and corners that are easy to navigate without running into someone. The tower will also be equipped with slide wire baskets for emergency evacuation to a staged blast-resistant vehicle.

The segments were assembled about four miles away from the launch pad so workers wouldn't be idled by launch preps for United Launch Alliance Atlas V rockets. The tower will be stacked just to the side of the hard stand at SLC-41 where the boosters lift off. It will take seven tiers to complete the more than 200-foot-tall tower. A swing-out walkway bridge will be added later to connect the tower to the hatch of the Starliner so astronauts can climb aboard the ship as it stands at the pad before launch.

Robert PearlmanNASA release
New Crew Access Tower Construction Progresses in Cape Canaveral

It took only 35 days to build the main column of a new fixture to the skyline along the Florida Space Coast. The 200-foot-tall Crew Access Tower at Cape Canaveral Air Force Station in Florida will meet the unique needs of astronauts and ground crews at Space Launch Complex 41, or SLC-41, where Boeing will launch its CST-100 Starliner spacecraft on Atlas V rockets operated by United Launch Alliance, also known as ULA.

"We spent a lot of time with conceptual designs and with the human elements, which is very important for a project of this nature," said Howard Biegler, ULA's Launch Operations lead for Human Launch Services. "Building a structure is one thing, but building it so that it's useful, that it provides a safe environment for the people who are going to be called to use this system is the hard part."

The structure features wider, more open areas than NASA's previous crew access towers, providing more room and comfort for astronauts who will walk around the area in pressure suits and possibly wearing helmets, and in emergency cases, walk through walls of water from fire suppression sprinklers. An escape system for the ground support teams and flight crews will be added to quickly move people from the top of the tower to the safety of an evacuation vehicle in less than a minute.

The tower location is unique, as well. Since 1968, all astronauts launched from the United States have flown exclusively from Launch Pads 39A and B at NASA's adjacent Kennedy Space Center.

Construction at the pad began in September when the first of seven steel tiers was trucked from four miles away where it was built and then placed atop a strengthened concrete foundation at SLC-41.

Built with many of the features already in place such as stairways, cable trays and blast shielding, each tier was designed to fit atop the other perfectly to reduce construction time at the pad. That's because ULA kept the pad operational so it could continue to launch Atlas V missions in between stages of tower construction.

"We have certainly changed the landscape out here," Biegler said. "The day the first tier physically made contact with the concrete and was bolted up brought a new level of reality to the project."

More work is ahead to complete the tower, but the main column stands in place as a herald for the next generation of human spaceflight in America. Steel sections branching off the main column will be in place by mid-January then the tower will be fitted with elevators, data lines and other elements. The tower's steel frame will weigh about 966,000 pounds when it's completed in fall 2016.

In late October, the structure's crew access arm was connected to the White Room, which will serve as the final corridor astronauts will pass through as they enter the Starliner spacecraft standing atop the Atlas V. The two components will be tested together extensively off-site before they are trucked to the launch complex and installed next summer.

Boeing anticipates launching the first flight test of its Starliner spacecraft carrying astronauts in 2017, but will use the tower before that time in the preparation for an earlier flight test without a crew aboard.

"It takes a lot of people working hard together to get any spacecraft into orbit successfully, and that's doubly true for a new spacecraft being built for humans," said Mike Burghardt, director of Launch Segment Integration for Boeing's Commercial Crew Program. "The Starliner will feature modern, high reliability components to significantly increase crew safety and we back that up with robust launch system, including this Crew Access Tower."

All the work is adding to the feeling that a new dawn of spaceflight is nearing as NASA's Commercial Crew Program and its partners Boeing and SpaceX continue development on systems that will carry up to four astronauts at a time to the International Space Station. With commercial spacecraft transportation, NASA plans to add an additional crew member to the station, effectively doubling the crew time dedicated to research on the orbiting laboratory.

Robert PearlmanNASA photo release
Workers install the White Room to the end of the Crew Access Arm at a construction yard in Oak Hill, Florida, as part of work on a new Crew Access Tower. The arm will be connected next year to the tower at Space Launch Complex 41 at Cape Canaveral Air Force Station adjacent to NASA's Kennedy Space Center. Credit: NASA/Daniel Casper

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