Whether you’re dealing with a car or a computer, poor maintenance habits lead to the same consequence: disaster. You’re on the freeway, carefully driving at the posted speed limit, and your engine suddenly dies. You go to the mechanic, who roots out the cause: your timing belt broke. You would have replaced your timing belt, had you kept to the maintenance schedule and taken your car in for service at 60,000 miles. Airline maintenance crews who stick to a steadfast and detailed maintenance schedule rarely have this happen to them, mainly because they know precisely on what date the plane was maintained, at what time, and what maintenance was performed.