In "A Cub Pilot," when the author says: "Judgement is a matter of brains, and a man must start with a good stock of that article, or he will never succeed as a pilot, he means that a person who lacks good judgement cannot be a good pilot (D).
A pilot needs to be able to make decisions to prevent potentially life-threatening situations from occurring. He, therefore, needs to either have good judgement or the ability to cultivate good judgement.