NASA managers will brief media about the Space Shuttle Program and the next mission (STS-121), at 2 p.m. EST, Tuesday at the press site at Kennedy Space Center, Fla. It will air live on the Web and NASA TV. Questions will be taken from media at participating NASA locations. New conference participants:

— Wayne Hale, space shuttle program manager
— Mike Leinbach, NASA launch director
–Tim Wilson, STS-114 External Tank Tiger Team lead, NASA Engineering & Safety Center

The 11th edition of “NASA’s Implementation Plan for Space Shuttle Return to Flight and Beyond” will be released at 9 a.m. EST, tomorrow on the Web at:

The implementation plan is periodically updated and demonstrates NASA’s progress in safely returning space shuttles to flight. The plan includes information learned during the July Return to Flight mission (STS-114). It also provides a status of work being done for the second mission in the Return to Flight sequence. Additional POCs: Kennedy, Bruce Buckingham, (321) 867-2468; Johnson Space Center, Kyle Herring, (281) 483-5111.

NASA TV’s Public, Education and Media channels are available on an MPEG-2 digital C-band signal accessed via satellite AMC-6, at 72 degrees west longitude, transponder 17C, 4040 MHz, vertical polarization. In Alaska and Hawaii, they’re on AMC-7 at 137 degrees west longitude, transponder 18C, at 4060 MHz, horizontal polarization. For digital downlink information on the Web, visit:

Information about NASA’s Space Shuttle Program, STS-121 and previous versions of the implementation plan are available on the shuttle Web site listed above.