Why must CG be verified within limits after fuel changes?

• A. To ensure the aircraft remains within structural and stability limits; re-check CG after fuel changes.
• B. To ensure the flight plan matches fuel price.
• C. To adjust avionics settings.
• D. To determine color of markings.

Answer: (A)

The main idea is that fuel changes shift the aircraft’s weight distribution. Fuel adds weight and where that weight sits changes the moment about the datum, so the overall center of gravity can move forward or aft. The aircraft is certified to operate within a specific CG range because that range keeps the airplane stable and controllable and keeps structural loads within what the design can safely handle. If fueling or fuel redistribution moves the CG outside that envelope, elevator authority, pitch stability, and stall behavior can be degraded, and loads on structures can approach unsafe levels. Re-checking the CG after any fuel change ensures you stay inside the approved limits for safe flight throughout the mission.