What will happen if the Primary Trim Switches on the yoke are activated when the A/P is engaged?

• A. The A/P will disconnect
• B. The aircraft will pitch-trim automatically to neutral
• C. The autopilot will maintain current attitude
• D. The flight director will disengage

Answer: (A)

When the autopilot is in control, using the primary trim switches on the yoke counts as a direct manual input to the elevator trim. The autopilot system is designed to yield to a pilot’s trim input, so engaging those switches causes the autopilot to disconnect. The aircraft then returns to pilot control for pitch adjustments, rather than continuing to hold or move to a new attitude automatically. This safety behavior prevents conflicting commands between automatic control and manual trim.