ATC Initial Tower Block 2 Practice Test

In braking action terminology, which term denotes no braking action?

BAD ZERO POOR NIL

Correct Answer:

NIL

Explanation:

NIL denotes no braking action. In braking action terminology, these terms describe how well a runway surface will allow an aircraft to decelerate. NIL means there is effectively zero usable friction; braking provides no useful deceleration, and stopping the aircraft becomes highly uncertain and much longer than normal. Pilots may have to rely heavily on thrust reversers and other procedures, and operations may be restricted or require a longer runway. Other terms indicate that some braking action remains (good, fair, poor), so nil is the only term meaning none at all. Some other words like zero or bad aren’t standard braking action terms in this context.

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