Alerting Systems General Principles: Warning, Caution, and Advisory Logic
Overview
The Flight Warning System (FWS) ensures the flight crew is aware of abnormal aircraft conditions. Its primary functions are to:
- Draw attention to the condition (Aural/Visual).
- Identify the specific problem.
- Prioritize alerts based on urgency (Internal Logic).
Alert Categories (CS-25)
Alerts are categorized by the level of crew awareness and action required. The color coding is strictly regulated.
| Category | Color | Definition | Crew Action |
|---|---|---|---|
| Warning | Red | Emergency condition requiring immediate recognition and corrective action. | Immediate |
| Caution | Amber / Yellow | Abnormal condition requiring immediate awareness and subsequent corrective action. | Subsequent |
| Advisory | Any (Prohibited: Red/Green) | Condition requiring crew awareness. | May be required |
Safe Operation
- Green is reserved for indicating safe, normal operation (e.g., Landing Gear Down & Locked). It is not used for alerts.
Location & Visibility
Master Warning and Master Caution lights must be installed in the pilot's direct line of vision (forward field of view) to ensure they are seen with minimum deviation from the normal flight path monitoring.