of whether corrective action is required will be made after assessment of
Extravehicular activity preparations proceeded smoothly. However,
more time was required than planned for completing the unstowage of equip-
ment and performing other minor tasks not normally emphasized in training
The oxygen purge system checkout was performed successfully. The
crew encountered two problems during pre-egress activities: (i) diffi-
culty in mating the remote control unit connector and (2) bumping items
in the cabin because of the bulk of the portable life suppo-_t system and
oxygen purge system; as a result, one circuit breaker was broken and the
positions of two circuit breakers were changed.
About i0 minutes was required to make each remote control unit con-
nector. Each time the crewman thought the connector was aligned, the
lock lever rotation caused the connector to cock off to one side. The
problem is discussed further in section 16.3.2.
While waiting for the cabin to depressurize, the crew were comfort-
able even though the inlet temperature of the liquid-cooling garment
reached about 90 ° F prior to sublimator startup. No thermal changes were
noted at egress. The portable life support system and oxygen purge system
were worn quite comfortably, and the back-supported mass was not objec-
tionable in i/6-g.
Analysis of the extravehicular activity data shows a good correla-
tion with data from previous training conducted in the Space Environmental
Simulation Laboratory facility. As expected, the feedwater pressure dur-
ing the mission was slightly higher than that indicated during simulations.
The difference results from the lunar gravitational effect on the head of
water at the sublimator and transducer, the high point in the system. The
only other discernible differences were in temperature readouts which gen-
erally indicated better performance (more cooling) than expected. Comfort
in the liquid cooling garment was always adequate, although the data indi-
cate a much higher temperature for the Commander than for the Lunar Module
Pilot. This observation correlates with previous simulation experience,
which shows that the Commander had a strong preference for a warmer body
temperature than that desired by the Lunar Module Pilot. This parameter
is controlled by each crewman to meet his comfort requirements. Operation
of the extravehicular mobility tu-_it in the extravehicular mode waswhile
uneventful. There was never a requirement to change any of the control
settings for the portable life support system other than the diverter
valves, which both crewmen changed at their option for comfort.