The EPECS will override PROP LOW SPEED mode and set the prop RPM to 1700 when?

• A. The PCL is moved into the takeoff range or the beta/reverse range
• B. The PCL is moved into the cruise range
• C. The PCL is in idle
• D. The PCL is in flight level change

Answer: (A)

EPECS is designed to ensure immediate, full-thrust response during critical phases by not letting the propeller be limited by PROP LOW SPEED. When you move the PCL into the takeoff range or into the beta/reverse range, the system overrides the PROP LOW SPEED setting and commands the prop RPM to 1700. This provides the necessary power and predictable throttle response for a safe, confident liftoff or effective use of reverse thrust for braking on landing. In cruise or idle ranges, there’s no need for that override—the aircraft benefits from the efficiency and quieter operation of the normal low-speed setting, so the PROP LOW SPEED mode remains active then.