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3

of the onboard computer and guidance system were rounded up to complemet

the Marshall-Johnson Space Center teams.

In

late

April

the

Skylab

control

room

was

activated.

The

flight

controllers spent the latter part of April, and May bringing the

batteries aboard Skylab up to a fully charged state and checking

out the various other peices of equipment which would be used.

Activity at the Skylab control room really picked up in June.

On: Thursday, June 8, flight controllers turned on the dormant

control

moment

gyros.

The

momentum

gyros

are

one

of

two

attitude

torque generating systems which are used to maneuver the space station

into

a

other.

position

and

Both

systems

hold

are

system

is

which

has

thruster

the

computer

various

it.

The

nitrogen

controlled

by

the

sensors to indicate position.

The momentum gyros worked as expected, although only two

of

the

three

aboard

gyro

malfnctioned

the

space

during

the

left.

The

mission

in

station

are

last

manned

momentum

third

1974.

On Friday, June 9, flight controllers used the vehicle's sun

sensors as an indicator of the vehicle's position and at the right

moment

commanded

the

vehicle

to

stabilize.

On

the

first

possible

attempt to stabilize the vehicle, controllers got their cue and

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