What is the target propeller RPM in normal operation?

• A. 1700 RPM
• B. 1500 RPM
• C. 1600 RPM
• D. 1800 RPM

Answer: (A)

The main idea here is how a constant‑speed propeller is controlled. In normal operation, the propeller is governed to hold a specific RPM to optimize efficiency and performance as you change power and airspeed. For the PC‑12 NGX, that target propeller speed is 1700 RPM. The propeller governor automatically adjusts the blade pitch to keep the rpm at that setting as you climb, cruise, or descend and as engine torque changes. This balance—enough blade angle to generate thrust without letting the prop overspeed or run too slow—gives good fuel efficiency, smooth operation, and reliable performance across the normal flight envelope. Other RPM values would move you out of the normal operating range; 1700 RPM is chosen because it provides the best compromise between thrust, efficiency, and protective limits for this aircraft and its PT6A-powered, five‑blade propeller.