What does the term 'Nil' braking action indicate?

• A. No braking action
• B. Good braking action
• C. Medium braking action
• D. Poor braking action

Answer: (A)

Nil braking action means there is no braking effect from the runway surface. Even with the brakes applied, deceleration is negligible because the surface is extremely slick (ice or heavily contaminated). It’s the worst category on the braking action scale, signaling very long stopping distances and increased risk of runway overruns, so pilots must plan for alternative deceleration methods and use extreme caution.