"The lower you fly, the more precision you need."
Generally speaking, at high levels above 10,000 feet, airplanes usually maneuver on thousand-foot increments. However, for lower levels, particularly during approaches, airplanes are required to have more precise control of altitudes in the magnitude of hundreds. Therefore, there is a circular switch located on top of the altitude selection knob, swapping selectable intervals at 100/1000 feet. Due to this special mechanism and its location on the very same axis as the push-pull altitude knob, the altitude selection module has been the greatest challenge during the development of the miniFCU (yet undeniably the perfect location for this function).