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NASA JSC/MOD Entry Options Tiger Team Presentation

Status Report From: Johnson Space Center
Posted: Thursday, May 1, 2003

Download 1.9 MB Powerpoint file

ENTRY OPTIONS
Results - Summary

  • Weight reduction scenario 3 (consumables, deployable items, Spacehab jettison, and FREESTAR jettison) yielded the best results, with a total weight reduction of 31,321 lbm.
  • Using certified deorbit targeting and STS-107 trajectory initial conditions, and the best case combination of other control variables, scenario 3 yielded the following results:
    • WLE body point 5505 (RCC): ~ 7% reduction in WLE max. temp.
    • Body point 1602 (tile): ~ 24% reduction heat load, ~ 34% reduction heat rate.
    • Body point 2360 (tile): ~ 29% reduction heat load, ~ 56% reduction heat rate.

  • Caveats to results:
    • Detailed risk assessment was not performed, however it is clear that the increase in risk would be very significant in order to achieve these weight reductions.
      • Numerous flight rule violations (e.g. consumables management, EVA, etc.).
      • Numerous undocumented/unverified procedures (e.g. EVA jettison tasks, IFM, etc.).

    • Combination of weight reduction categories (consumables, deployable items, and jettison) was not verified to be feasible (timeline, crew workload, detailed EVA task, etc.)
    • All results were for a "no damage" scenario. For damage, the heat load and heat rate reductions would likely not be directly applicable, depending on the degree of damage.
    • Best case combination of trajectory variables was not proven to be achievable.

    // end //

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