"I have here," his hands turning over several cards and slips of paper, "reports from various ground officials that you two students stayed in the air an hour overtime this afternoon, tampering with engines, and riding with motors missing--when every principle of air flight warns a flyer to seek a landing when his motor misses. No matter how well a man flies, we can never make an aviator out of him if he hasn't sense enough to know that he is in deadly peril if he continues to fly a missing engine. A knock in a motor presages engine trouble, and engine trouble presages a forced landing. At the first hint of mechanical defection, it's a flyer's duty to head down and make as speedy and safe a landing as possible--"