With the electric boost pumps in Auto, the crew can expect the respective pump to operate:

With the electric boost pumps in Auto, the crew can expect the respective pump to operate:

• A. Only during engine start
• B. Only on the ground
• C. Only when manually commanded
• D. In all the listed cases

Answer: (D)

Electric boost pumps are there to ensure fuel pressure to the engine during conditions when the engine-driven pump isn’t delivering yet or might be starved, such as at start or when priming. When the pumps are in AUTO, they come on automatically under the situations that guarantee a reliable fuel supply: during engine start to prime and quickly establish pressure, on the ground to prime and prevent fuel starvation when starting from the runway, and they remain available to run if you manually command them to ON. That combination means the pumps can operate in all the listed scenarios, which is why this option is the best choice.

Electric boost pumps are there to ensure fuel pressure to the engine during conditions when the engine-driven pump isn’t delivering yet or might be starved, such as at start or when priming. When the pumps are in AUTO, they come on automatically under the situations that guarantee a reliable fuel supply: during engine start to prime and quickly establish pressure, on the ground to prime and prevent fuel starvation when starting from the runway, and they remain available to run if you manually command them to ON. That combination means the pumps can operate in all the listed scenarios, which is why this option is the best choice.