STS-94 was the reflight, with the same equipment and crew, of the curtailed STS-83 mission. Cargo Bay Payloads:

• MSL-1: The Microgravity Science Laboratory included the first test of the International Space Station�s EXPRESS Rack. MSL-1 also contained numerous other experiment payloads to test materials and combustion processes in zero gravity.
• CRYOFD: The Cryogenic Flexible Diode (CRYOFD) heat pipe was a Hitchhiker payload.
• OARE: The Orbital Acceleration Research Experiment was a self-calibrating instrument that monitored extremely small accelerations and vibrations experienced during orbit of the Shuttle.

  In-Cabin Payloads: SAREX, MSX

  The mission this time went for its full two week duration and the crew completed the full list of experiments. The deorbit burn was on July 17, 1997 at 09:44 GMT and Columbia landed on KSC's Runway 33 at 10:46:34 GMT.

  Following a modified processing session at Kennedy Space Center, Columbia lifted off a little late (because of some clouds downrange), at 18:02:02 GMT. The RSRM-62 solid rocket motors separated at 18:04 GMT. The ET-86 external tank separated at 18:11:13 GMT leaving Columbia in an elliptical transfer orbit which was circularized later by the OMS engines to a 296 x 301 km orbit inclined at 28.5 deg to the equator.

  Development Test Objectives / Detailed Supplementary Objectives / Risk Mitigation Experiments

  DTO 255: Wraparound DAP Flight Test Verification

  DTO 312: External Tank TPS Performance

  DTO 416: Water Spray Boiler Quick Restart Capability

  DTO 667: Portable In-Flight Landing Operations Trainer

  DTO 677: Evaluation of Microbial Capture Device in Microgravity

  DTO 684: Radiation Measurement in Crew Compartment

  DTO 805: Crosswind Landing Performance

  DSO 331: Integration of the Space Shuttle Launch and Entry Suit

  DSO 487: Immunological Assessment of Crewmembers

  DSO 493: Monitoring Latent Virus Reactivation and Shedding in Astronauts

  RME 1330: Wireless Data Acquisition System

  Payload And Vehicle Weights: Orbiter (Columbia) empty and 3 SSME�s: 85,114 kg; Shuttle System at SRB Ignition: 2,051,646 kg; Orbiter Weight at Landing with Cargo: 117,806 kg; MSL-1 Spacelab Module: 10,169 kg; CRYOFD: 346 kg; OARE: 114 kg. References: 4 , 7 , 276 .