Performance at commercial level
Reading takeoff, climb, cruise, and landing charts precisely, with real numbers worked step by step.
16 min read · The complex airplane
After this lesson you can
- Compute pressure altitude and density altitude from field elevation, altimeter setting, and OAT.
- Interpolate a takeoff or landing distance table between two published data points.
- Extract fuel, time, and distance to climb from a chart by subtracting departure values from cruise-altitude values.
- Read a cruise power setting table and a cruise/range chart to plan fuel and time for a leg.
Every performance chart in an AFM/POH is built from real test flight data, gathered by engineers flying a new airplane under normal conditions with average piloting skill. That data is only as good as the reading of it: a small error at the start of a combined graph compounds into a large error by the time you reach the answer. A complex, heavier, faster airplane operates closer to its performance limits more often than a trainer does, which is exactly why commercial-level chart reading has to be exact rather than approximate.
This lesson works through real numbers from FAA reference tables, the same kind your POH will contain, computing pressure altitude, interpolating a takeoff distance, pulling fuel and time to climb from a chart, and reading a cruise power setting table — the full sequence a commercial pilot uses to plan a leg before ever starting the engine.
The rest of this lesson
- 1.Reading charts as a system, not a lookup
- 2.Pressure altitude and density altitude, worked
- 3.Takeoff distance: interpolating a table
- 4.Wind and surface corrections
- 5.Climb performance, worked with a retractable-gear chart
- 6.Cruise power management
- 7.Landing distance, worked
These 7 sections, their figures, the checks along the way and the end-of-lesson quiz come with the CPL track. Paid once, yours for good.
Key terms
Try to recall each definition before turning the card.