THURSDAY, MARCH 26, 1998 (1:31 PM EST)
NOTE: Launch pad validations continue and Columbia's hydraulic connections are complete. Main engine ball seal leak checks are in work and preparations are under way for the helium signature leak test set for tomorrow. Purging of the gaseous nitrogen (GN2) lines on the mobile launch platform and cleaning of a GN2 panel continues through next week. Auxiliary power unit interface leak checks are under way and preparations for hypergolic system loading are in work. Prelaunch propellant load is slated for the middle of next week.
On Monday, the orbiter's payload bay doors will be opened to give technicians access to two bolts on a getaway special canister. Workers will add a washer to each bolt to ensure proper torque and the doors will be closed again on Tuesday. The minor unplanned work will not impact the launch date.
STS-90 SCHEDULED OPERATIONAL MILESTONES (dates are target only):
NOTE: Discovery's body flap shaft installation is complete and body flap rub panel modification is in work. External tank (ET) separation camera modifications continue and the super lightweight tank instrumentation work is underway. Auxiliary power unit lubrication servicing is in progress.
Preparations continue for tunnel adapter installation Tuesday. Payload premate testing begins tomorrow and continues through Saturday. Preparations are also in work for main engine installation late next week. In the Vehicle Assembly Building, preparations continue for orbiter/ET mate.
STS-91 SCHEDULED OPERATIONAL MILESTONES (dates are target only):
(NODE-1, PMAs 1 and 2)
NOTE: Leak checks of the replaced liquid hydrogen four-inch disconnect are complete and good. Change-out of a leaky liquid oxygen prevalve on Endeavour's main propulsion system is complete and checks are in work. Draining of the right-hand orbiter maneuvering system fuel cross-feed lines has been rescheduled to next week. Next week, technicians will also remove the forward reaction control system (FRCS) to replace a leaky thruster. Torque checks of the orbiter's left wing-to-fuselage attach bolts continue. Installation of the manipulator positioning mechanism that supports the robot arm continues.
STS-88 SCHEDULED OPERATIONAL MILESTONES (dates are target only):
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