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6

was again in tracking station coverage and controllers could activate

the

inadvertantly

disabled

momentum

gyro.

Press

accounts

at

the

time

said

the

vehicle

had

gone

out

of

control.

It

had

gone

out

of

the palnned mode of control, but within the program the computer was

working from, the vehicle remained within control with the nitrogen

system and when it came b

into tracking station coverage had

_

maintained its position.

By Saturday, June 10, the Marshall team had verified by

ground computer simulation back in Alabama that their understanding

of the porblem was complete and everything was looking good for the

final maneuvers scheduled for early Sunday morning.

At 1:50 a.m. CDT, Sunday, June ll, Skylab was commanded to

go

from

solar

inertial

position

to

"Z-local

vertical."

The

ZLV

position keeps the space station's long axis parallel to the

surfact

of

the

Earth

that

its

over

at

any

given

moment.

The

space station executed the command flawlessly and the stage for the

final,

minimum

drag,

position

was

set.

During

the

next

station

pass at 3:28 a.m. CDT the vehicle's computer was commanded to modify

the ZLV position by allowing the Skylab to roll so the solar

panels

match

with

respect

the

the

Sun's

changing

position

the

Skylab

orbit

about

in

the

sky.

three

degrees

Sun

changes

day.

This

The

per

placed the vehicle in what is the thinnest profile in its orbit.

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