Continued maintenance of the Skylab space station and extensive scientific and medical experiments. Installed twinpole solar shield on EVA; performed major inflight maintenance; doubled record for length of time in space. Completed 858 Earth orbits and 1,081 hours of solar and Earth experiments; three EVAs totalled 13 hours, 43 minutes.

The space vehicle, consisting of a modified Apollo command and service module payload on a Saturn IB launch vehicle, was inserted into a 231.3 by 154.7 km orbit. Rendezvous maneuvers were performed during the first five orbits as planned. During the rendezvous, the CSM reaction control system forward firing engine oxidizer valve leaked. The quad was isolated. Station-keeping with the Saturn Workshop began approximately 8 hours after liftoff, with docking being performed about 30 minutes later.

Skylab-3 MANHOUR UTILIZATION
 
MEDICAL ACTIVITIES            312.5   "        8.0   "
SOLAR OBSERVATIONS            305.1   "        7.8   "
EARTH RESOURCES               223.5   "        5.7   "
OTHER EXPERIMENTS             243.6   "        6.2   "
SLEEP, REST & OFF
             DUTY            1224.5   "       31.2   "
PRE/POST SLEEP &
           EATING             975.7   "       24.8   "
HOUSEKEEPING                  158.4   "        4.0   "
PHYSICAL TRAINING
& PERSONAL HYGIENE            202.2   "        5.2   "
OTHER (EVA) ETC               279.7   "        7.1   "
 
                    TOTAL:   3925.2   "      100     "