Hank knew there was nothing wrong with the array, even before he’d climbed up. He knew Serenity like the back of his hand, and like Kaylee he knew when something was amiss, and it wasn't the array. Sunlight beat up off the metal skin of the Firefly, sweat dripping from the end of his nose to splat on her plating, and he never knew if that was the cause, but suddenly his feet slipped out from under him and he went down onto his buttocks, sliding inexorably towards the edge and the drop some sixty-odd feet below. He tried to scramble back, but there was nothing to hold onto, and he knew he was going to fall.
-- Ordinary Day - Part VI by Jane0904