The surface support center was a cleared, partially filled area 

 (Figure 9) containing the command van, the utilities trailer, a tube 

 trailer, and a small parts trailer. 



The command van layout (Figure 10) was a converted 30-foot semi- 

 trailer. It was divided into a watch director's section and a behav- 

 ioral observer's section by a partition and an accordian door. The 

 watch director's section was equipped to provide continuous monitoring 

 of each compartment in the habitat by visual and aural means, and to 

 provide continuous and intermittent monitoring of the habitat atmosphere 

 and trunkway water level, either by gas analyzers or alarms. A control 

 panel (Figure 11) contained: two television monitors which, through a 

 selector switch, could be used to view either of the four habitat 

 compartments ; an intercom unit providing voice communication to each of 

 the habitat compartments; a speaker output from the four open micro- 

 phones in the habitat, which could be used by the watch director for 

 certain specified monitoring functions; a remote readout from the 

 habitat O2 and CO2 analyzers; an alarm panel. A sound powered phone 

 on the watch director's bench provided voice communication to the 

 habitat during power-outs. 



A Varian Aerograph Model 1800 gas chromatograph located behind the watch 

 director's station monitored O2 , CO2, N2, and several trace gases in the 

 habitat. The gas sample was taken from the gas return line in the 

 umbilical bundle, dried and analyzed. 



Figure 9. Surface Support Center 

 11-13 



