When flaps transition from 2 to 1 at or below 210 kts, what is the resulting configuration?

When flaps transition from position 2 to position 1 at or below 210 knots, the aircraft configuration changes to CONF 1+F. The CONF 1+F configuration includes not only the flaps being set to position 1 but also enables the use of the slats. This configuration provides additional lift sufficient for maintaining low-speed flight characteristics, which is particularly beneficial during approach and landing phases.

The "F" in CONF 1+F signifies that the flight is enhanced by the extended slats, improving aerodynamic performance. Knowing this configuration is crucial for pilots as it affects the handling characteristics of the aircraft, ensuring safety and efficiency in operations during critical phases of flight.

In contrast, the other configurations such as CONF 1, CONF 2, and CONF 2+F do not represent the correct configuration that occurs at this specific flap transition, especially at the given airspeed limit.