Why is it important to know the CG limits (forward and aft) for flight planning?

• A. To ensure the airplane remains controllable, within stability margins, and within structural and performance envelopes throughout loading and fuel burn.
• B. To maximize fuel efficiency at all times.
• C. To ensure the airplane matches color scheme.
• D. To minimize maintenance cost.

Answer: (A)

Knowing the forward and aft CG limits is about keeping the airplane controllable and within safe margins as loading changes during flight. The center of gravity position directly affects pitch stability and elevator authority, so staying within these limits ensures there is enough control to rotate for takeoff, maintain stable flight, and recover from upsets. It also keeps the structural and performance envelopes within what the airplane was certified to handle, since weight and balance determine how loads are distributed across the airframe.

As fuel burns and crew, passengers, or cargo shift, the CG moves. Flight planning with CG limits ensures the aircraft remains inside safe boundaries from takeoff through climb, cruise, descent, and landing, preserving stability, controllability, and required performance margins at every stage. The limits are not about maximizing fuel efficiency, matching a color scheme, or minimizing maintenance costs. Those aspects aren’t governed by the CG envelopes.