Which valve type is specifically described as ACSC controlled in the CRJ bleed system?

• A. PRSOVs
• B. LCVs
• C. HP bleed valves
• D. 10th stage bleed valves

Answer: (A)

In the CRJ bleed system, the component that the Air Conditioning System Controller directly commands to manage bleed air flow is the pressure regulating shutoff valve. These valves are designed to regulate the bleed pressure feeding the environmental control system and to isolate the bleed source when needed. The ACSC sends control signals to these valves to maintain the desired pressure for the packs and to shut off bleed air if a fault or a demand condition requires it. That direct ACSC control is what makes this valve type described as ACSC controlled.

Other valve types in the bleed path—such as those that simply regulate or route air to the packs, or valves tied to engine bleed start logic—aren’t described as ACSC controlled in the CRJ system. The PRSOVs specifically serve the role of dynamically regulating and isolating bleed air under ACSC commands, which is why they’re the correct choice.