STS-107 and the ISS

In the early 2000’s the Space Shuttle program was deeply into the construction of the International Space Station, spurred on by America’s commitments to its sixteen partner agencies and countries. All components for the ISS, less those from Russia, were designed to be launched and serviced by the Shuttle. No other launch vehicle had its capacity or its capability. The ISS and Shuttle were tied at the hip, mutually dependent, fulfilling one of the early goals of the Shuttle program itself.

And, buoyed by the string of extremely successful missions following the Challenger accident in 1986 NASA was planning to extend the Shuttle program through 2020.

We at KSC were doing our advance planning to do major overhauls and upgrades of the four Shuttles. These Orbiter Modification and Development Periods (OMDP) were as important parts of the launch manifests as the missions themselves. Originally performed at the shuttle’s manufacturing site in Palmdale CA, they were now all to be done at KSC to save money and time.

Good decision, to be sure, but it had one unattractive impact on us. We had three Orbiter Processing Facilities (the hangars) but four Orbiters to deal with. That meant one Orbiter had to be at one of three other locations at any given time – in space, at the launch pad, or in the Vehicle Assembly Building. No way around it. (Had one landed at the Edwards AFB in CA it still would have been brought back to KSC after approximately a week.)

So how did this affect STS-107 and Columbia? With the emphasis on the ISS assembly missions, Columbia’s pure science mission was usually the one to be delayed when the higher priority ones needed something, anything. This included an OPF. Columbia was moved around KSC fairly often, always causing its scheduled launch date to be postponed.

STS-107’s launch date slipped thirteen times between when the mission was originally announced in 1997 and when it finally flew in January 2003. Flowliner cracks, wiring problems, and even unexpected problems with the Hubble Space Telescope de-prioritized STS-107’s science research flight and caused mission delays.

In response to Congress’ concern about delays and cost growth on the ISS, NASA committed to getting the Unity module (Node 2) to the ISS by the end of February 2004. That would essentially complete the installation of the US components that were on the critical path to bringing the Station up to its scientific potential.

It’s important to note that since Columbia was the heaviest Orbiter, it couldn’t launch to the ISS inclination without significant decrease in payload weight and giving her a new airlock. And NASA initially did not intend to fly her to the Station. But as of 2002, the delays caused by the issues mentioned above meant that Columbia needed to be pressed into service for ISS assembly if the February 2004 date was to be met.

Immediately following STS-107, Columbia was scheduled to go into an OMDP that would have seen modifications to lose weight to fly a single ISS assembly mission. And ironically, part of her weight loss would have included stripping out much of the MADS/OEX system—the “black box” that was so important in helping to pinpoint the accident cause in 107.

The interesting thing about launch slips or priority-induced effects on processing plans is that the KSC workers became used to them and it caused little more than temporary disappointment. It was simply part of the business.

Rick Husband and his crew had the same response. He and I talked about it once. Again, it was simply part of the business of space flight.

Eventually NASA settled on an achievable launch date for the 107 mission and we met it. Its outcome had nothing to do with the delays. Not a thing.

Columbia under a tent in the VAB, awaiting space in an OPF (NASA Photo KSC-02PD-1196)

Author: Mike Leinbach

Mike was the final Space Shuttle Launch Director at NASA's John F. Kennedy Space Center. He led the launch team for all Shuttle missions from August 2000 to the end of the program in 2011, giving the final "go" for every launch.

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