Which of the following is a Takeoff Configuration Warning?

• A. Aileron Trim
• B. Mach Trim
• C. Auto Trim (Flap Compensation)
• D. Pitch Trim

Answer: (A)

Takeoff configuration warnings are about having the aircraft properly prepared for liftoff, particularly the control surfaces and their trims. On the CRJ-550, the aileron trim is what the system monitors as a critical factor for a stable initial roll. If the aileron trim is outside the takeoff range or not centered, the airplane can roll or yaw unexpectedly during the takeoff roll, so a warning is issued to prompt correction before rotation.

Mach trim, auto trim (flap compensation), and pitch trim relate to other systems or flight phases and do not indicate a takeoff configuration problem. So the takeoff configuration warning points to the aileron trim.