FAA AMT Airframe Test 2026 – 400 Free Practice Questions to Pass the Exam

The control-surface indicating system is a flight instrument that displays the position of the aircraft's control surfaces, such as the elevator, ailerons, and rudder. It is used by pilots to monitor the current configuration of the aircraft's control surfaces. During a particular phase of flight, the control-surface indicating system is used to show the trim position of the aircraft. This is important because proper trim ensures the aircraft is in a stable and efficient state. Options A, B, and D are not indicated by the control-surface indicating system during a particular phase of flight as they pertain to other flight parameters such as fuel level, engine performance, and altitude. Therefore, option C is the correct answer.