what happens when you exceed the maximum angle of attack?

stall occurs

In aerodynamics, a stall is a sudden reduction in the lift forces generated by an airfoil. This occurs when the critical angle of attack of the airfoil is exceeded, typically about 14 to 16 degrees.

A stall is a condition in aerodynamics and aviation where the angle between the wing's chord line and the relative incoming wind (the angle of attack) increases beyond a certain point such that the lift begins to decrease. The angle at which this occurs is called the critical angle of attack. This critical angle is dependant upon the profile of the wing, its planform, and its aspect ratio but is typically in the range of 8 to 20 degrees relative to the incoming wind for most subsonic airfoils. The critical angle of attack is the angle of attack on the lift coefficient versus angle-of-attack curve at which the maximum lift coefficient occurs, and it usually represents the boundary between the wing's linear and nonlinear airflow regimes. Flow separation begins to occur at this point, decreasing lift, increasing drag, and changing the wing's center of pressure. A fixed-wing aircraft during a stall may experience buffeting or a change in attitude (normally nose down in General aviation aircraft). Most aircraft are designed to have a gradual stall with characteristics that will warn the pilot and give the pilot time to react. For example an aircraft that does not buffet before the stall may have an audible alarm or a stick shaker installed to simulate the feel of a buffet by vibrating the stick fore and aft. The "buffet margin" is, for a given set of conditions, the amount of ‘g’, which can be imposed for a given level of buffet. The critical angle of attack in steady straight and level flight can only be attained at low airspeed. Attempts to increase the angle of attack at higher airspeeds can cause a high speed stall or may merely cause the aircraft to climb.

Any yaw of the aircraft as it enters the stall regime can result in autorotation, which is also sometimes referred to as a 'spin'. Because air no longer flows smoothly over the wings during a stall, aileron control of roll becomes less effective, whilst simultaneously the tendency for the ailerons to generate adverse yaw increases. This increases the lift from the advancing wing and accentuates the probability of the aircraft to enter into a spin.

Depending on the aircraft's design, a stall can expose extremely adverse properties of balance and control; particularly in prototype. The ease with which a particular aircraft will recover from a stall depends on the dynamics of the aircraft itself and the training of the pilot.

Critical Angle Of Attack

You Stall. When the Angle of Attack is exceeded the air no longer flows properly over the wings and lift is destroyed. Most fixed wing aircraft are designed to have one wing stall before the other. This will cause the aircraft to roll to the right or left when a stall occurs. This helps the pilot recover the aircraft better.

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RE:

what happens when you exceed the maximum angle of attack?

If the critical angle of attack is exceeded, your aircraft will stall.

As far as a spin, this would be created by a stalling condition in uncordinated flight.

Hope this helps answer your question.

Hmmmm. There is no maximum angle of attack. There's a critical angle of attack. And you only spin if you exceed that on one wing. The other has to keep flying or you won't spin.

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you stall, once you lose the smooth air flow over the wings there is no more lift, so you stall

Your aircraft stalls and it could go into into a flat spin, which at times are unrecoverable.

Yes, a spin is possible if you stall and don't recover properly.