But Hal Dane did take up this same type of ship again. He did it at his own risk, and at his urgent insistence. From his perilous performance in mid-air he thought that he knew what were the faults of construction that had caused the ship to shatter under strain. Previous work in his department, the risk department, had taught him to learn something of real value to flying from every accident. In this case, he asked for the chance to prove what he had learned. So weeks later, he took up the very same type of ship, greatly strengthened, and put her through the same test. This time he and the ship went up and came down together, none the worse for wear, and he could write O. K. on her examination sheet.