False

Explanation:
Cantilever beams are not always in equilibrium. Equilibrium refers to a state where the sum of all forces and moments acting on a body is zero. For a cantilever beam to be in equilibrium, the applied loads, reactions, and internal forces within the beam must all balance each other out.

1. External Forces:
- Cantilever beams are subjected to various external loads such as point loads, distributed loads, and moments.
- If the applied loads are balanced and the sum of the moments about any point is zero, then the beam is in equilibrium.
- However, if the applied loads are unbalanced, the beam will experience a net force or moment and will not be in equilibrium.

2. Internal Forces:
- Cantilever beams also have internal forces, such as shear forces and bending moments, which develop within the beam due to the applied loads.
- These internal forces must also be in equilibrium to ensure that the beam is stable.
- If the internal forces are not balanced, the beam will experience deformation or failure.

3. Equilibrium Equations:
- To analyze the equilibrium of a cantilever beam, we need to consider the equilibrium equations.
- These equations are based on the principles of statics and include the sum of forces in the horizontal direction, the sum of forces in the vertical direction, and the sum of moments about a point.
- By solving these equations, we can determine the reactions at the support and the internal forces within the beam.
- If the equilibrium equations are not formed or solved correctly, the beam may not be in equilibrium.

Conclusion:
In conclusion, cantilever beams are not always in equilibrium. They can only be in equilibrium if the applied loads, reactions, and internal forces within the beam are balanced. Therefore, it is important to analyze the equilibrium of cantilever beams using proper equilibrium equations to ensure their stability and structural integrity.