What is the minimum flap retraction speed indicated in the relevant graphic?

The minimum flap retraction speed is critical for safe aircraft operation, particularly after takeoff. This speed ensures that the aircraft has sufficient aerodynamic performance while transitioning from a configured flap setting to a clean configuration. The correct answer indicates that the minimum flap retraction speed is set at 145 knots.

This value is significant as it represents a balance between aircraft performance and safety; retracting the flaps too early—before the aircraft reaches this minimum speed—could lead to an undesirable aerodynamic condition, such as a stall. The speed data provided is derived from the aircraft's operational limits as documented in the aircraft's operating manual or performance charts.

Understanding this minimum speed helps pilots make informed decisions during key phases of flight, especially in takeoff scenarios where performance is critical for safe climb-out. The other provided options do not match the standard minimum flap retraction speed as identified in the specific aircraft data, thereby confirming the importance of using accurate information from trusted sources during flight operations.