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## Weather 

• Automated Surface Observing System (ASOS), Automated Weather Observing System (AWOS), Low-Level Wind Shear Alert System, Flight Service automation system, Operations and Supportability Implementation System, NextGen Weather Radar, Terminal Doppler Weather Radar, Weather and Radar Processor, and Weather Messaging Switching Center Replacement 

## 3.5.4.2.2 Using the NAS Equipment Worst Credible Severity Table 

When assessing the severity of hazards related to NAS equipment, use the “NAS Equipment” row in Table 3.3 in conjunction with Table 3.4. Table 3.4, the NAS Equipment Worst Credible Severity Table, is the starting point for severity assessments of NAS equipment. The severity of hazards that result from specific equipment changes may be lower or higher than the worst case presented in Table 3.4 due to the possible controls that limit exposure or the interactions and dependencies that exist with other systems. Because effects of losses in equipment functionality and equipment malfunctions may not necessarily be traceable to a loss in separation, equipment safety effects may require separate assessment from operational effects (i.e., assess the severity of equipment loss or malfunction irrespective of operational severity). 

The severity levels in Table 3.4 are derived from the operational safety analyses and other documentation produced during initial safety assessments completed as part of the AMS processes that define severity based on the inherent functionality of systems. References to high or low traffic are relative indications during a period of time at any given facility. 

## Table 3.4: NAS Equipment Worst Credible Severity Table 1 

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