April 29
Space Shuttle Discovery landed at Edwards Air Force Base in California. ("Shuttle Returns; Antenna Problems Plague Hubble," Huntsville News, April 30, 1990)
April 29
The Hubble Space Telescope Orbital Verification Team sent the last in a series of commands that overcame an apparent jam in one of the telescope's two high gain antennas. The jam had precluded the use of the antenna system since the morning of April 27. (Marshall Star, May 2, 1990)
April 30
A Combined Release and Radiation Effects Satellite mission rehearsal was conducted at the Air Force's consolidated Space Test Center from April 30 through May 4. (See MSFC History Office Microfiche #2127, "Notable MSFC Events During 1990," May 14, 1990)
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