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If the total exceeds a certain level, the flight is altered or cancelled. Informal research shows that while these are useful documents for teaching risk factors, they are almost never used outside of formal training programs. The 5P concept is an attempt to take the information contained in those sheets and in other available models and put it to good use. 

The first decision is whether to go or not to go on the flight, and the easiest point at which to cancel due to bad weather is the evening before the scheduled flight. A good pilot always watches the weather and checks weather information sources to stay abreast of current conditions and forecasts. This enables him or her to warn passengers that the weather conditions are questionable and they might need a backup plan. The subsequent visit to the flight planning room (or call to AFSS) provides all the information readily available to make a sound decision, and is where communication and 

Fixed Base Operator (FBO) services are readily available to make alternate travel plans. [Figures 6-11 and  6-12] 

For instance, the easiest point to cancel a flight due to bad weather is before the pilot and passengers walk out the door and load the aircraft. So, the first decision point is preflight in the flight planning room. 

The second easiest point in the flight to make a critical safety decision is just prior to takeoff. Few pilots have ever had to make an emergency takeoff. While the point of the 5P check is to help the pilot fly, the correct application of the 5 Ps before takeoff is to assist in making a reasoned go/ no-go decision based on all the information available. The decision is usually to go with certain restrictions and changes but may also be a no-go. The key fact is that these two points in the process of flying are critical go/no-go points on each and every flight. [Figure 6-13] 

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