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Physiologically, body position and orientation during work assignments are of no consequence.
In a contingency, a crewman will use any handy, flat area as a work surface, such as the top of a fan housing.
Even an air intake filter screen is usable as a make-shift work surface.
Although airflow into the screen is low, objects will cling to it.
In one instance airflow was used to hold small parts during a camera repair.