Why are there red and green lights?

In aviation, red and green lights serve critical purposes for safe operations:

*Red Lights:*

1. Warning or caution: Indicates potential hazards or system malfunctions.

2. Navigation: Red lights on runway edges or approach paths warn pilots of obstacles.

3. Anti-collision: Red lights on aircraft wings or tails increase visibility.

4. Alertness: Red lights in cockpits alert pilots to critical system failures.

*Green Lights:*

1. Go/Clear: Indicates clearance for takeoff, landing, or taxiing.

2. Navigation: Green lights on runway centers or approach paths guide pilots.

3. Confirmations: Green lights confirm system operations (e.g., landing gear down).

4. Visual Glideslope Indicators (VGSI): Green lights indicate proper glide slope.

*Other Colors:*

1. Amber/Yellow: Caution or advisory (e.g., system malfunction).

2. Blue: Informational (e.g., fuel quantity).

3. White: General information (e.g., taxiway centerlines).

*Aviation Lighting Systems:*

1. Runway Lighting: Edge, center, and threshold lights.

2. Approach Lighting: Guides pilots to runway threshold.

3. Taxiway Lighting: Edge and center lights.

4. Obstacle Lighting: Warns pilots of obstacles.

*International Standards:*

1. International Civil Aviation Organization (ICAO)

2. Federal Aviation Administration (FAA)

3. European Aviation Safety Agency (EASA)

These standardized colors and lighting systems ensure safe and efficient aviation operations worldwide.

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