Definition
The most forward longitudinal location of the airplane's center of gravity (CG) that is permitted by the manufacturer's approved loading limits. Loading the airplane so the CG sits at this forward limit produces the highest stall speed, the heaviest control forces in pitch, and the largest stick-force gradient, while also giving the airplane its strongest natural pitch stability.
Plain English
The farthest forward the airplane's balance point is allowed to be when loaded. With the weight pushed this far forward, the nose feels heavier, the controls feel firmer, and the airplane stalls at a slightly higher speed than it would with the load farther back.
Context Anchor
Seen in weight-and-balance information and in discussions of stall behavior, control feel, and takeoff or landing performance.
Derivation
CG stands for center of gravity, meaning the point where the airplane's weight is considered to balance. In this term, forward means toward the nose, and maximum means the allowed limit, not the best or strongest setting.
Why Pilots Care
Placing the center of gravity beyond this limit raises stall speed and increases the force needed to recover from a stall.
Analogy
Think of balancing a ruler on your finger. If the balance point moves too far toward one end, it becomes harder to hold level. An airplane with a very forward CG is similar: the nose wants to feel heavier.
Intuition Check
Maximum forward CG does not mean the most desirable CG. It means the farthest-forward balance point the airplane is allowed to have.
Example Sentence 1
With two adults in the front seats and no baggage in the rear, the loading sheet showed the airplane was right at maximum forward CG, so the pilot expected a higher stall speed and firmer pitch feel on landing.
Example Sentence 2
At the maximum forward CG the airplane needed noticeably more back pressure to break the stall.