How many hydraulic pumps are on the CRJ-700?

• A. 2 ACMP, 4 EDP
• B. 4 ACMP, 2 EDP
• C. 6 ACMP, 3 EDP
• D. 3 ACMP, 3 EDP

Answer: (B)

Hydraulic power on the CRJ-700 comes from two kinds of pumps, chosen for redundancy across the aircraft’s hydraulic systems. Engine-driven pumps (EDP) are powered by the engines and provide the main hydraulic pressure during normal operation. Air-driven pumps (ACMP) run on bleed air and supplement or supply pressure when needed, especially if engine-driven pumps aren’t delivering pressure or additional capacity is required.

The CRJ-700 uses four air-driven pumps and two engine-driven pumps. That gives six pumps in total, with the ACMPs providing additional, bleed-air–driven support to ensure hydraulic pressure remains available across the systems, while the EDPs cover the primary hydraulic supply. This combination supports reliable operation of flight controls and other hydraulic-dependent systems under various flight and ground conditions.