When does the Fuel Low CAS message illuminate?

• A. 80 lbs remaining
• B. 100 lbs remaining
• C. 134 lbs remaining
• D. 150 lbs remaining

Answer: (C)

Fuel Low CAS is tied to a fixed fuel-quantity threshold in the NGX’s fuel-management system. It lights when the usable fuel on board drops to 134 pounds (about 20 gallons). This threshold is chosen to give you a timely warning to plan for a landing with adequate reserves, before you’re critically low. It’s a pure fuel-management alert, not related to engine performance or system faults. The other numbers aren’t the system’s alert point, so 134 pounds is the correct illumination point.