Question

Under what category does zero visibility conditions come?

(a) Category I

(b) Category II

(c) Category III

(d) Category IV

The question was posed to me in an online interview.

Enquiry is from ILS/MLS Coupled Landing System and Automatic Landing topic in section Autopilots and Flight Management Systems of Avionics

Answer 1

The correct option is (c) Category III

To explain: Visibility conditions are divided into three categories, namely Category I, Category II and Category III, depending on the vertical visibility ceiling and the runway visual range (RVR). Category III includes zero visibility conditions.