What occurs when the fuel quantity reaches 1650 pounds in either inner wing compartment?

When the fuel quantity in either inner wing compartment reaches 1650 pounds, at least one transfer valve in each wing opens. This process is essential for managing fuel distribution within the aircraft. The opening of the transfer valves allows fuel to be transferred from the center tank to the wing tanks, ensuring that there is always an adequate supply of fuel in the wings to maintain balance and support efficient engine operation.

This mechanism is crucial for maintaining optimal fuel levels across the various tanks, contributing to aircraft stability and performance. It also plays a role in preventing any possible fuel starvation for the engines as the aircraft burns fuel during flight.

The other options reference different aspects of fuel management. For instance, the center tank pumps turning off would actually occur at a different fuel level or under a different condition, and the wing tank pumps turning off serves a distinct function in managing fuel flow under different scenarios. Fuel recirculation stopping does not directly relate to the operational protocol at the 1650-pound threshold in the inner wing compartments.