Which condition will illuminate the L or R FUEL LEVEL LO lights?

Which condition will illuminate the L or R FUEL LEVEL LO lights?

• A. When wing tanks are full
• B. When 225 pounds of fuel or less exists in the center tank for the respective side
• C. When engine is off
• D. When aft fuselage tank is depleted

Answer: (B)

Low fuel warning indicators are tied to the center tank quantity on the respective side. When the center tank on that side drops to 225 pounds or less, the L or R FUEL LEVEL LO light comes on. This warning gives you advance notice to manage fuel distribution, plan a crossfeed, or prepare for landing with sufficient reserves before the center tank is empty. The other conditions don’t trigger this warning: having wing tanks full isn’t a low condition, the engine being off isn’t what sets a level-warning light, and the aft fuselage tank is a separate reservoir with its own indicators.

Low fuel warning indicators are tied to the center tank quantity on the respective side. When the center tank on that side drops to 225 pounds or less, the L or R FUEL LEVEL LO light comes on. This warning gives you advance notice to manage fuel distribution, plan a crossfeed, or prepare for landing with sufficient reserves before the center tank is empty.

The other conditions don’t trigger this warning: having wing tanks full isn’t a low condition, the engine being off isn’t what sets a level-warning light, and the aft fuselage tank is a separate reservoir with its own indicators.