On the ED2 and fuel synoptic pages, the main tank fuel quantity indications turn amber under which conditions?

• A. If any tank is below 200 lbs
• B. If either main tank is less than 600 lbs, or total fuel is less than 1200 lbs, or fuel imbalance exceeds 800 lbs
• C. Only when total fuel is less than 500 lbs
• D. Only during maintenance mode

Answer: (B)

Amber on the ED2 and fuel synoptic pages signals a caution about fuel state that could affect safe operation. It lights up when the fuel situation crosses one of three thresholds, meaning you should pay attention and plan a course of action.

First, if either main tank falls below 600 pounds, the display flags amber to alert you that one side is running low. Low fuel in a single main tank can lead to uneven distribution and potential fuel starvation risks, so the crew is prompted to balance the tanks or adjust consumption.

Second, a total fuel amount under 1200 pounds triggers the amber warning. This indicates there isn’t enough overall fuel to comfortably complete the current flight plan with reserves, divert options, or holds. It’s a cue to consider diversion, reduce unnecessary fuel burn, or refuel.

Third, an imbalance greater than 800 pounds between tanks also causes amber. A large imbalance can affect aircraft handling and safety, so the alert encourages actions to rebalance fuel sooner rather than later.

These conditions are chosen to warn you at practical, actionable levels. They’re not about maintenance mode or a single low-quantity condition; instead, they cover low quantity in either tank, low total fuel, and large imbalance—each requiring attention and a plan to maintain safe operation.