Lawrence flew as the ascent/entry flight engineer and blue shift orbit pilot on STS-67 in March 1995. This mission was the second flight of the ASTRO observatory, a unique complement of three telescopes. During this record-setting 16-day mission, the crew conducted observations around the clock to study the far ultraviolet spectra of faint astronomical objects and the polarization of ultraviolet light coming from hot stars and distant galaxies. Mission duration was 399 hours and 9 minutes.
Carried Astro 2 astronomy payload with 3 UV telescopes.(attached to Endeavour).Payloads: Ultraviolet Astronomy (ASTRO) 2; Middeck Active Control Experiment (MACE); Protein Crystal Growth—Thermal Enclosure System (PCG-TES) 03; Protein Crystal Growth—Single-Locker Thermal Enclosure System (PCG-STES) 02; Commercial Materials Dispersion Apparatus Minilab/Instrumentation Technology Associates, Inc. Experiments (CMIX) 03; Shuttle Amateur Radio Experiment (SAREX) II; two getaway special experiments.
Atlantis was launched on a mission to the Russian Mir space station. The TI rendevous terminal initiation burn was carried out at 17:32 GMT on September 27, and Atlantis docked with the SO (Docking Module) on the Mir complex at 19:58 GMT. The crew exchange was completed on September 28, with David Wolf replacing Michael Foale on the Mir crew. On October 1 cosmonaut Titov and astronaut Parazynski conducted a spacewalk from the Shuttle payload bay while Atlantis was docked to Mir. They retrieved four MEEP (Mir Environmental Effects Payload ) exposure packages from Mir's SO module and installed the Spektr solar array cap. The MEEP experiments had been attached to the Docking Module by astronauts Linda Godwin and Rich Clifford during Shuttle mission STS-76 in March 1996. In addition to retrieving the MEEP, Parazynski and Titov were to continue an evaluation of the Simplified Aid For EVA Rescue (SAFER), a small jet-backpack designed for use as a type of life jacket during station assembly.
Atlantis undocked from Mir at 17:28 GMT on October 3 and conducted a flyaround focused on the damaged Spektr Module to determine the location of the puncture in its hull. The Mir crew pumped air into the Spektr Module using a pressure regulator valve, and the Shuttle crew observed evidence that, as expected, the leak seemed to be located at the base of the damaged solar panel. Final separation of Atlantis from Mir took place around 20:28 GMT. After two landing attempts were waved off on October 5 due to heavy cloud cover, the crew fired the engines to deorbit at 20:47 GMT on October 6 and landed at Kennedy Space Center at 21:55.
The final shuttle-Mir mission, STS-91 recovered NASA astronaut Andy Thomas from the Mir station and took Russian space chief and ex-cosmonaut Valeri Ryumin to Mir for an inspection tour of the ageing station. This was the first test of the super lightweight Aluminium-Lithium alloy external tank, designed to increase shuttle payload to the Mir / International Space Station orbit by 4,000 kg. At 22:15 GMT Discovery entered an initial 74 x 324 km x 51.6 deg orbit, with the OMS-2 burn three quarters of an hour later circulising the chase orbit. Discovery docked with the SO module on Mir at 17:00 GMT on June 4. NASA equipment was retrieved from the station, and Discovery undocked at 16:01 GMT on June 8, and landed on Runway 15 at Kennedy Space Center at 18:00 GMT on June 12.