Refer to figure.
The tail plane is able to supply the necessary force to balance any residual pitching moments because it is positioned some distance from the aircraft's center of gravity and has a large moment arm.
If the CG is in front of the CP, giving a nose-down pitching moment and there is no thrust/drag moment to oppose it, the tail plane must provide a download to maintain equilibrium. Lift must be increased to maintain an upwards force equal to the increased downwards force.
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