Improper rigging of the elevator trim tab system affects which axis of the airplane?

Improper rigging of the elevator trim tab system primarily affects the lateral axis of the airplane. The lateral axis runs from wingtip to wingtip and relates directly to the aircraft's pitch control, which is influenced by the elevator’s function. The elevator and elevator trim tab are essential for controlling and stabilizing pitch, allowing the aircraft to ascend or descend smoothly.

When the trim tab is rigged incorrectly, it can cause an imbalance in the forces acting on the tail section, resulting in unintended pitch commands. This means the aircraft may pitch up or down without the pilot's intention, leading to difficulties in maintaining level flight or achieving the desired climb or descent rates. Proper rigging of the elevator trim tab ensures that the elevator can efficiently control the aircraft's angle of attack, aiding in effective pitch management along the lateral axis.