# What is the difference between equilibrium and steady flight?

If I'm flying a regular Cessna 172 and its perfectly trimmed and flying in circles holding the same altitude, is the aircraft in equilibrium? Or steady flight?

(The definition of equilibrium flight condition occurs when the sum of all forces and moments about the center of gravity is zero)

I would appreciate the clarification.

Equilibrium means all forces sum to zero. Per Newton's law $$\sum F=ma$$ this means that the total acceleration is also zero.