What RPM should you approach at 55 knots during a level speed change?

When approaching a level speed change at 55 knots, maintaining an appropriate RPM is crucial for ensuring smooth flight operations and performance. The selected RPM of 2100 is typically recommended as it provides a balance between power and efficiency at this speed.

At 55 knots, the aircraft requires enough power to maintain altitude while also allowing for adequate control and responsiveness. An RPM of 2100 is often seen as optimal for providing a good climb and descent performance while maintaining speed stability. This RPM allows the aircraft's engines to operate within their efficient power range, avoiding excessive fuel consumption or overrevving, which can occur with higher RPM settings.

Setting the RPM too low would compromise performance, potentially leading to a stall or inadequate power during the maneuver. Conversely, higher RPM settings may induce unnecessary strain on the engine and increase fuel consumption without providing additional benefits for maintaining level flight at the specified speed. Therefore, 2100 RPM is the appropriate choice for this scenario.