Both systems are controlled by a computer which has various
sensors to indicate position.
third gyro failed during the last Skylab manned mission in 1974 and
is not being used.
(in which the spacecraft solar ce
the TACS and stayed in that posit
On June 9, Skylab was comman
ded into a solar inertial attitude
a spurious signal from an onboard
switch selector during subsequent
commanding caused Skylab to move
automatically switched control to
the vehicle was returned to solar
inertial and placed under CMG
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.