The normal position of the Yellow ELEC Pump pushbutton for flight is which?

The normal position of the Yellow ELEC Pump pushbutton for flight is which?

• A. Off
• B. On
• C. Auto
• D. Standby

Answer: (A)

The key idea is how the yellow hydraulic system is pressurized. In normal flight, the yellow system is supplied by its engine-driven pump, so there’s no need for the electric pump to run. The yellow electric pump is a backup/priming source and is kept OFF during normal operations to avoid unnecessary electrical load and to rely on the engine-driven pump for normal hydraulics. You would turn it ON only in specific non-normal situations where extra hydraulic pressure for the yellow system is required (for example if the engine-driven pump isn’t providing adequate pressure or during certain start/ground/backup scenarios).

The key idea is how the yellow hydraulic system is pressurized. In normal flight, the yellow system is supplied by its engine-driven pump, so there’s no need for the electric pump to run. The yellow electric pump is a backup/priming source and is kept OFF during normal operations to avoid unnecessary electrical load and to rely on the engine-driven pump for normal hydraulics. You would turn it ON only in specific non-normal situations where extra hydraulic pressure for the yellow system is required (for example if the engine-driven pump isn’t providing adequate pressure or during certain start/ground/backup scenarios).