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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.

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NASA JSC

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