About the EVA Procedures by Prabhu Victor
Pre-brief:
The day before each EVA, mission
control gives the crew members a pre-brief on what to expect during the EVA.
This includes explaining about the tasks, the equipment available and results
that are expected. The crew then decides which crew members will perform the
EVA’s and who remains in the habitat to act as Capsule Communication (CAPCOM). The
CAPMCOM in this instance acts as a relay for information between mission
control and the EVA team. The crew then prepare all the necessary tools they
need for the EVA and set them aside.
Pre-EVA:
The Pre-EVA is an extensive process that takes about 30 mins
to complete.
Figure 1: This is the usual attire of someone about to wear the NDX-2AT space suits. 1. The headset is connected to a radio used to communicate with mission control and CAPCOM. The headset provides voice activated communication which provides the crew member the ability to use both of their hands for other EVA related activities. 2. The upper body clothing is tight fitted and covers most of the skin to mitigate bacteria contamination with the bladder of the NDX-2AT suits. The tight fit allows the crew member to slide into the suit easier without having any cloth bunch up while entering the suit. 3. The pack holds both the batteries for the suit as well as the radio used for hands free communication. 4. The white gloves prevents the crews hand from sticking to the inside bladder of the suit due to perspiration. The gloves also mitigate bacterial contamination of the suits. 5. Tight fitted pants allow the crew member to slide into the suit easier without having any of the pants bunch up from the inside bladder. 6. Long socks are worn over the pants in order to prevent the hem of the pants getting caught in the inner bladder. Shoes are not worn when entering the suits.
Fig. 2
Fig. 3
Figure 2, 3: Here, the crew members can be seen fitting
the suits with the suit cameras. The cameras give CAPCOM a video transmission
of each suit which allows for better coordination and communication between the
EVA crew and CAPCOM.
Getting in the suits:
4a 4b
4c
During EVA
Figure 5: After donning the suits the EVA team exit
the EVA module and begin completing their objectives. In this example, the crew
had to use UND’s Roborover, built by Space Studies graduate student Chris
Follette, to retrieve samples places around the ILMAH in specific GPS
coordinates. The crew used a handheld GPS to locate the samples, retrieve them
and place them in the sample return box located in the Pressurized Electric
Rover.
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