When inspecting the tires on a rubber-tired backhoe prior to operation, what would be considered a critical defect requiring immediate attention and possibly red-tagging the machine?

Question: When inspecting the tires on a rubber-tired backhoe prior to operation, what would be considered a critical defect requiring immediate attention and possibly red-tagging the machine?

Answer options:

• Slight discoloration on the tire sidewall from scuffing.
• Tire pressure 15 kPa (2 psi) below the manufacturer's recommended cold inflation pressure. ✅ A deep cut in the sidewall exposing cord material.
• Minor chipping on the tread lugs from normal wear.

Correct answer: A deep cut in the sidewall exposing cord material.

Explanation: A deep cut exposing cord material is a critical defect that significantly weakens the tire's structural integrity, posing a severe risk of sudden catastrophic failure. Such a defect necessitates immediate repair or replacement.