A compressor stall in an aircraft is an extreme situation of abnormal airflow caused by the abnormal stall of compressor blades in the compressor. This normally occurs when the speed of the blade exceeds its critical angle of rotation resulting in one or more rotor blades failing to pass enough air to the following stages of the engine. The air can then become overpressurized and the engine fails to cool as it should, causing the failure of both the blades and the engine.
This type of air flow problem is caused by the movement of a leading edge (the leading edge of the blade) from a certain angle into the air duct leading from the main rotor shaft. The problem can also occur if the leading edge of the blade has been partially obstructed, either by debris or by the leading edge being in an abnormal position. This condition usually occurs at low speeds when the blade is being rotated very rapidly; at high speeds, this can cause a significant loss of air pressure. Once the air flow is blocked, it causes the speed of the blade to decrease and the air pressure can begin to rise causing the engine to fail. This is when the pilot must take corrective action to save the engine.
In most cases, pilots will experience this stall at low speeds and never notice the stall until it becomes very high speed and the pilot cannot control it anymore. As a result, the pilot will often not be able to regain control and will crash the airplane. In extreme cases, the pilot may lose control and be forced to eject. This is the most dangerous situation to be in because it can cause the aircraft to crash in an uncontrolled manner. Pilots are trained to recognize and avoid the situations that cause this type of air flow failure. However, in some rare occasions, the airflow can get so high that it causes the pilot to lose control of the aircraft, causing the loss of control and death.