(04/19/1997) --- McDonnell Douglas-SPACEHAB technicians prepare to place a Russian-made oxygen generator into position for transport in a SPACEHAB Double Module being processed for flight on Space Shuttle Mission STS-84. The module is undergoing preflight preparations in the SPACEHAB Payload Processing Facility just outside of Gate 1 on Cape Canaveral Air Station. The Space Shuttle Atlantis will carry the oxygen generator to the Russian Space Station Mir to replace one of two Mir units that have been malfunctioning recently. The nearly 300-pound generator functions by electrolysis, which separates water into its oxygen and hydrogen components. The hydrogen is vented and the oxygen is used for breathing by the Mir crew. The generator is 4.2 feet long with a diameter of 1.4 feet. STS-84, which is planned to include a Mir crew exchange of astronaut C. Michael Foale for Jerry M. Linenger, is targeted for a May 15 launch. It will be the sixth Shuttle-Mir docking