When the CMG is shadowedfor excessiveperiods of time, the
bearing temperaturedrops which results in decreased lubricationand
increasedbearing friction leadingto possibleCMG failure. The
CMG is essentialfor Skylab to hold a stable attitude.
By turning the Skylab around in its orbit, before mid-November,
the CMG will be exposed to more Sun and normal temperaturescan be maintained.
The reversedpositionof the Skylab is not expected to change
the orbital life predictionsby any significantamount.
The vehicle will be turned around again, back to the forward
EOVV, in about six months in order to maintainproper Sun exposure
to the CMG.
This maneuver is not expected to use any of the remaining
nitrogenthruster fuel which is being reservedfor use during
dockingmaneuvers with the teleoperatorretrieval system planned
for the second Space Shuttle flight.
On Sunday, October 15, the trackingstation at Santiago,
Chile, was put on line for the Skylab reactivation. There are
now five tracking stationssupportingthe Skylab mission:
Goldstone,California;Bermuda Island;Ascension Island;Madrid,
Spain; and Santiago. Also on Sunday the flight control operation
at Houston Mission Control went to a 24-hour-a-dayoperation.