Question

Which one of the following is not a basic parameter used to define visibility category?

(a) Decision height

(b) Minimum vertical visibility

(c) Runway length

(d) Runway visual range

I have been asked this question in a job interview.

My question is taken from ILS/MLS Coupled Landing System and Automatic Landing topic in portion Autopilots and Flight Management Systems of Avionics

Answer 1

Correct answer is (c) Runway length

Explanation: The two basic parameters used to define the visibility category are the decision height, that is the minimum vertical visibility for the landing to proceed and the runway visual range. The length of a runway is not used to define visibility category.