What items should be checked for wear or damage on pins, bolts, and retaining devices during inspection?

• A. Aesthetics of bolts.
• B. Bolt color only.
• C. Brand of pins.
• D. Signs of fatigue, cracks, elongation, looseness, missing cotter pins, improper retention.

Answer: (D)

When inspecting pins, bolts, and retaining devices, the key idea is to look for signs that the fasteners are no longer capable of performing safely under load. The best choice highlights what truly indicates wear or damage: fatigue signs and cracks that show the metal is degrading under repeated stress; elongation or stretching beyond the original dimensions, which means the fastener has been overridden and weakened; looseness that suggests excessive clearance or improper engagement; missing cotter pins, which are essential to prevent rotation or disengagement; and improper retention, meaning the hardware isn’t secured as designed (clips, nuts, or retainers not in place or correct). These indicators point to a real risk of fastener failure in service, so the part should be replaced or reinstalled to spec.

Superficial attributes like the bolt’s color or aesthetics, or even the brand of pins, don’t reliably reflect structural integrity or safe retention, so they aren’t appropriate criteria for assessing wear or damage.