Which of the following statements is NOT procedurally correct when initiating a slip?

The statement that full rudder deflection should be used to maintain control during a slip is not procedurally correct. In a slip, the goal is to achieve a controlled descent with a specific bank and rudder input. While rudder input is necessary to maintain coordinated flight, utilizing full rudder deflection can lead to ineffective control and undesirable flight characteristics.

Using too much rudder can increase drag and induce adverse yaw, which can destabilize the aircraft rather than aid in a controlled slip. Instead, the rudder should be applied effectively but not in excess, allowing for adequate control without losing energy or risking a stall.

In contrast, correctly initiating a slip involves lowering the inboard wing (the wing that is lower in a turn) while using the appropriate amount of opposite rudder pressure to balance the aircraft's yaw and maintain a desired flight path. Maintaining airspeed below 150 KIAS during a slip is also a standard practice to avoid exceeding the aircraft's operational limits and to ensure safe handling characteristics.