CAPE CANAVERAL, Fla. – At the flight readiness review news conference for space shuttle Discovery's STS-119 mission, Space Shuttle Program Manager John Shannon (right) talks about the discussion surrounding Discovery's readiness for flight. At left is Associate Administrator for Space Operations Bill Gerstenmaier. NASA managers decided Feb. 20 more data and possible testing are required before proceeding to launch. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – At the flight readiness review news conference for space shuttle Discovery's STS-119 mission, Space Shuttle Program Manager John Shannon (right) talks about the discussion surrounding Discovery's readiness for flight. At left is Associate Administrator for Space Operations Bill Gerstenmaier. Shannon is holding a flow control valve that is under review and testing. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – Mike Curie (far left), with NASA Public Affairs, moderates the flight readiness review news conference for space shuttle Discovery's STS-119 mission. On the panel are (from left) Associate Administrator for Space Operations Bill Gerstenmaier, Space Shuttle Program Manager John Shannon and Space Shuttle Launch Director Mike Leinbach. During a thorough review of Discovery's readiness for flight, NASA managers decided Feb. 20 more data and possible testing are required before proceeding to launch. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. NASA managers decided Feb. 20 more data and possible testing are required before proceeding to launch. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – At the flight readiness review news conference for space shuttle Discovery's STS-119 mission, Space Shuttle Program Manager John Shannon talks about the discussion surrounding Discovery's readiness for flight. NASA managers decided Feb. 20 more data and possible testing are required before proceeding to launch. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – At the flight readiness review news conference for space shuttle Discovery's STS-119 mission, Associate Administrator for Space Operations Bill Gerstenmaier talks about the review by mission managers of Discovery's readiness for flight. NASA managers decided Feb. 20 more data and possible testing are required before proceeding to launch. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. Photo credit: NASA/Glenn Benson

CAPE CANAVERAL, Fla. – Associate Administrator for Space Operations Bill Gerstenmaier, Space Shuttle Program Manager John Shannon and Space Shuttle Launch Director Mike Leinbach respond to media questions about the flight readiness review news conference for space shuttle Discovery's STS-119 mission. NASA managers decided Feb. 20 more data and possible testing are required before proceeding to launch. Engineering teams have been working to identify what caused damage to a flow control valve on shuttle Endeavour during its November 2008 flight. A new launch date has not been determined. Photo credit: NASA/Glenn Benson