What is the minimum flap extension speed for the first notch of flaps (Flaps 1)?

The minimum flap extension speed for the first notch of flaps (Flaps 1) is indeed 150 KIAS. This speed is essential to ensure safe and effective flap deployment during flight operations. When flaps are extended, they change the aerodynamic characteristics of the aircraft, increasing lift at a given speed, which is critical during takeoff and landing phases.

Operating below the minimum flap extension speed may result in inadequate airflow over the control surfaces, leading to unpredictable handling characteristics and potential loss of control. The specified speed allows pilots to safely deploy the flaps without exceeding the aircraft's aerodynamic limits, ensuring that the aircraft remains stable and controllable during the flap extension process. Understanding this limitation is crucial for maintaining safety during operations in the King Air 350.