Observer Performance Criterion 2.1b

Observing visibility

Performance Criterion Description:

The observer accurately evaluates visibility parameters including directional visibility,

prevailing visibility, vertical visibility and RVR data.

Scenario:       

During an assessment period the observer is asked to apply knowledge and skill to evaluate and report visibility parameters. 

Evidence:

The observer must use knowledge and skill to 

• accurately evaluate visibility under daytime and night time conditions
• issue timely regular visibility reports and special reports based on  visibility threshold values
• evaluate and report on RVR data
• apply daytime and night procedures for measurement and or estimation of vertical visibility
• correctly reports visibility hourly and issues special reports at appropriate changes in threshold values