Which hydraulic pumps are not controlled by the Hydraulic Control Panel?

• A. EDP1 and EDP2
• B. EDP3 and EDP4
• C. EDP2 and EDP3
• D. MAIN and AUX

Answer: (A)

The main idea is that some hydraulic pumps are driven by the engines and operate automatically, while others are electric pumps that you can turn on or off from the Hydraulic Control Panel. Engine-driven pumps (EDP1 and EDP2) are tied directly to their respective engines and come on as part of normal engine operation or hydraulic demand; they aren’t controlled from the Hydraulic Control Panel. In contrast, electric pumps (EDP3 and EDP4) are the ones the Hydraulic Control Panel manages, allowing you to start or stop them as needed or as backup. So the pumps not controlled by the Hydraulic Control Panel are EDP1 and EDP2.