What is a typical sign of a worn-out arresting gear brake lining?

• A. Braking is smoother and shorter stopping distance.
• B. No change in braking feel but color change.
• C. Only external wear occurs.
• D. Reduced braking effectiveness; increased stopping distance; audible squeal.

Answer: (D)

The main idea here is how wear affects the actual braking performance of arresting gear. When the brake lining wears down, the friction material that slows the aircraft becomes thinner, so the braking force you get decreases. That means you’ll see reduced braking effectiveness and a longer stopping distance. You’ll often also hear an audible squeal as the remaining lining interacts with the brake assembly or as metal components begin to contact inappropriately. Color changes or only external wear aren’t reliable indicators of functional wear, and they don’t describe the loss of braking performance. So, the typical sign is a noticeable drop in braking effectiveness with a longer stop and usually an audible squeal.