As part of the acceptance procedures for NT004, Matt Kilkerr (our Technical Manager) and myself inspected the airship with a close eye. Riding a cherry picker to view the airship from above, we noted where the man-lines and valves are. The square piece of fabric on top is a test patch of the same fabric as the envelope. On a regular basis, samples are taken from this patch to measure degradation due to UV light, weather etc.
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