Not all of the information on the charts is easily extracted. Some charts require interpolation to find the information for specific flight conditions. Interpolating information means that by taking the known information, a pilot can compute intermediate information. However, pilots sometimes round off values from charts to a more conservative figure.

Using values that reflect slightly more adverse conditions provides a reasonable estimate of performance information and gives a slight margin of safety. The following illustration is an example of interpolating information from a takeoff distance chart. [Figure 10-20]

-Click to Enlarge- Figure 10-20. Interpolating charts.

Related posts:

1. Performance Charts
2. Airplane Flight Manuals (AFM) (Part Six) – Performance
3. Takeoff and Landing Performance – Runway Surface and Gradient
4. Pressure Altitude – Range Performance (Part Two)
5. Takeoff Performance (Part One)