NASA Space Shuttle Processing Status 3 December 2004

Discovery (OV-103)

Critical path work continues to progress well in the Orbiter Processing Facility (OPF) for
Discovery?s Return to Flight mission, designated STS-114, to the International Space Station. The
three Space Shuttle Main Engines will be moved from the Main Engine Shop into the OPF for
installation on Discovery early next week.

Installation of the new wing leading edge sensors and cable continues on both the right and left
wings. The sensors and relay boxes are being added for Return to Flight on the backside of the
Reinforced Carbon-Carbon panels, and should detect any temperature increase or impact data during
the launch.

Atlantis (OV-104)

Final power-down work on the wiring for the Return to Flight modifications is almost complete in
the Orbiter Processing Facility in preparation for the scheduled power up of Atlantis early next
week. The payload bay doors of Atlantis were closed last week in support of scheduled maintenance
work to be performed in the bay. Following the successful completion of the maintenance, the doors
were reopened and processing work began.

Fuel cells No. 1 and 3 were installed for flight, with No. 2 scheduled to be installed today. Fuel
cells use oxygen and hydrogen to provide electrical power during a mission. All four Rudder Speed
Brake (RSB) actuators were inspected and installed on Atlantis. Technicians are currently beginning
to install the RSB panels and seals.

Endeavour (OV-105)

Space Shuttle Endeavour is in its Orbiter Major Modification period, which began in December 2003.
Electrical modifications continue in the crew module. Three-String Global Positioning System wire
routing in the avionics bay and flight deck continues.

While the Reinforced Carbon-Carbon panels are removed from the vehicle for inspections, technicians
are preparing the wing leading edge for their reinstallation. Following the removal of miniscule
corrosion, the right-hand wing leading edge is being prepared for painting. The External Tank doors
are being installed in preparation for Endeavour?s roll-over for a temporary stay in the Vehicle
Assembly Building. Endeavour will be moved so that maintenance can be performed in the bay.