Page 175

National Aeronautics and Space Administration

A.3.2

EVA23Water Intrusion

PE102 Vision Restricted by Meteorological Conditions

Vision Restricted by Meteorological Conditions is a factor when weather, haze, or darkness restricted the vision of the individual to a point where normal duties were affected. Vision Restricted by Meteorological Conditions was investigated and found contributory to the HVCC. Evidence:

Transcripts from Audio Logs, Post EVA 23 Crew Debrief, Post HVCC interview data from MOD EVA, CORE, SA and CB/Astronaut Office personnel

After the call to terminate, sunset occurred while EV2 began his translation back to the airlock.

During times of darkness, greater caution is required when translating around the space station. There are some objects/obstacles which impede movement and others which can cause damage to the space suit, such as cuts to gloves or other material.

EV2 was disoriented during his translation to the airlock and his visibility conditions due to water in the helmet created an unsafe situation. Poor meteorological conditions (e.g. darkness) contributed to an already unsafe situation.

While visibility restrictions alone did not lead to the HVCC, they could have led to undesired outcomes, making them a contributing factor.

Finding: •

EV2 had more difficulty than usual translating to the airlock at night.

A-18

ISS EVA Suit Water Intrusion Mishap Investigation Report  
ISS EVA Suit Water Intrusion Mishap Investigation Report  

Report of the NASA Mishap Investigation Board examining the high visibility close call event of July 16, 2013 when ESA astronaut Luca Parmit...

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