What arm should be extended to move the aircraft to the left?

When directing an aircraft to move left, the use of the right arm is standard practice because it serves as a visual cue for the ground crew. Extending the right arm signals to personnel and anyone observing that the aircraft should turn left. This method of directing movement relies on the concept of positioning the arm that is furthest from the intended direction of movement, effectively creating a clearer communication strategy for ground operations. The right arm points away from the left turn, allowing for better visibility for those involved in maneuvering the aircraft. This practice is rooted in the need for clear communication and safety on the ramp. Understanding the conventional use of arm signals helps ensure efficient and safe ground handling procedures.