For Air Midwest flight 5481 For any controlled process it can be proven that there are only four ways that a control can become unsafe: 1. Not providing the control action leads to a hazard. 2. Providing the control action leads to a hazard. 3. Providing a potentially safe control action but too early, too late, or in the wrong order 4. The control action lasts too long or is stopped too soon (for continuous control actions, not discrete ones)