How many hydraulic pumps are on the CRJ?

• A. 2 Electric and 4 Engine driven
• B. 4 Electric and 2 Engine driven
• C. 3 Electric and 3 Engine driven
• D. 5 Electric and 1 Engine driven

Answer: (B)

Hydraulic power on the CRJ comes from two sources: engine-driven pumps and electric pumps. There are two engine-driven pumps, each associated with a hydraulic system, and four electrically driven pumps available to back up or supplement pressure. This gives six pumps in total. The engine-driven pumps supply hydraulic pressure during normal operation, while the electric pumps can provide pressure when engines aren’t driving pumps or to ensure redundancy. So the CRJ has four electric pumps and two engine-driven pumps.