Unit 11 review: Performance and Weight & Balance
A mixed check of all 3 lessons in this unit. Mixing topics is harder than one lesson at a time, and that's the point: it's how the written test and the oral exam ask.
The unit in one minute
- Density altitudeDensity altitude rises with high elevation, high temperature, low pressure, high humidity.
- Takeoff and landing performance chartsUse the pressure altitude and temperature, then apply the chart's notes.
- Weight and balanceMoment = weight × arm; CG = total moment ÷ total weight.
Mixed check
12 questions pulled from across the unit. Wrong answers explain why and point you back to the lesson.
Explain it to your CFI
Say each one out loud in your own words, in under a minute. If you stall, reread that lesson. This is exactly what an examiner looks for.
- Density altitude. Compute pressure altitude
- Takeoff and landing performance charts. Use a takeoff distance chart
- Weight and balance. Explain datum, arm, moment and CG
What the examiner may ask
What's the density altitude today and how will it affect your takeoff?
Compute it from pressure altitude and temperature, then use the POH charts for takeoff and climb distances.
Is the airplane within weight and balance limits for today's flight?
Show your computation for takeoff and landing (fuel burned), and compare with the POH envelope.
How do you lean for takeoff at a high-elevation airport?
Follow the POH; many trainers call for leaning for best power during the run-up at high density altitudes.
Can you land at a 2,200-foot runway today?
Compute the landing distance with the POH, apply corrections for wind and surface, and compare with the runway available, including your margin.