S89-28089 (24 Jan 1989) --- The Space Shuttle Discovery is lowered for mating to the external tank and two solid rockert boosters in the vehicle assembly building (VAB) at the Kennedy Space Center. Onboard the spacecraft in mid-March for a five-day mission, on which will be deployed a third tracking and data relay satellite (TDRS-D), will be Astronauts Michael L. Coats, John E. Blaha, James F. Buchli, James P. Bagian and Robert C. Springer.