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JSC Negotiates with A-V Corporation for Audiovisual Public Information - page 74 / 146

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Page 3

Both systems are controlled by a computer which has various

sensors to indicate position.

Two

of

the

gyros

were

activated

and

worked

as

expected.

A

third gyro failed during the last Skylab manned mission in 1974 and

is not being used.

(in which the spacecraft solar ce

lls

the TACS and stayed in that posit

ion

On June 9, Skylab was comman

ded into a solar inertial attitude

always

face

the

Sun)

using

under

CMG

control.

However,

a spurious signal from an onboard

switch selector during subsequent

commanding caused Skylab to move

from

this

position.

The

vehicle

automatically switched control to

the

TACS.

On

the

next

orbit,

the vehicle was returned to solar

inertial and placed under CMG

control.

For

this

reason,

engine

ers decided to delay the final

maneuver to the low-drag attitude

for a day so that Marshall engineers

could perform simulations to unde

rstand the problem and hopefully

prevent it from recurring.

Early Sunday, June ll, Skylab was maneuvered into its desired

"end-on-velocity-vector" attitude in which the docking port is forward

and its long axis is parallel to the ground and along the flight path.

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