yee@trident.arc.nasa.gov (Peter E. Yee) (04/13/90)
STS-31/HST SCRUB TURNAROUND STATUS
Thursday, April 12, 1990 - 1:30 p.m. EDT
NASA managers today set April 25, 1990 as the new
target launch date for Shuttle Mission STS-31. This date is
based on the decision to remove and replace APU #1 on
Space Shuttle Discovery and to allow time for recharging
the Hubble Space Telescope (HST) batteries.
The decision to replace APU #1 comes after examination
of the APU controller by the manufacturer, which verified
that no problems existed within the controller. A new APU,
scheduled for delivery to KSC this week, will serve as the
replacement APU on Discovery.
The recharging of the HST batteries will be accomplished
by removing the batteries from the telescope and charging
them in a laboratory. This allows the batteries to be
serviced under the most favorable conditions while HST
remains in the clean environment of the cargo bay.