Primary Systems 2 Practice Test

On EICAS, the color of the left and right fuel quantity indicators when below the threshold?

Red Green Yellow Blue

Correct Answer:

Yellow

Explanation:

The system uses color to signal levels: green means normal, yellow (amber) signals a cautionary, low level, and red indicates a critical condition. When fuel quantity falls below the pre-set threshold, the left and right indicators turn yellow to warn the crew that fuel is below the desired level and needs attention. This remains yellow until a more severe condition (below minimum/critical) would trigger a red alert. So, below the threshold, yellow is the correct color because it marks a warning status, not an immediate emergency.

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