What is the maximum speed for Vfe4?

The correct answer is 180 KIAS, which signifies the maximum speed for Vfe4, the flap extended speed for a specific flap position. This speed is critical for safe aircraft operation as it indicates the maximum velocity at which the flaps can be safely extended to reduce the risk of structural damage or loss of control. It ensures that pilots maintain proper handling characteristics and stability during approaches or landing configurations when the flaps are deployed. Adhering to this speed enhances safety and performance during flight operations, particularly at lower altitudes and speeds.

The other options reflect speeds that exceed the maximum allowable Vfe4 limit, potentially leading to unsafe flight conditions. Flying above this speed with flaps extended can result in increased aerodynamic drag, potential structural stress on the aircraft, and could impair the aircraft's control response during crucial phases of flight. Therefore, knowing and adhering to the correct Vfe4 value is vital for pilot training and operational success.