ATPL REVISION NOTES PERFORMANCE – REFRESHER REVISION NOTES
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These ATPL revision guides have been written and refined by experienced ATPL instructors and airline pilots to support structured, efficient study across all ATPL subjects. The content is deliberately condensed into a clear, easy-to-read format, focusing on the knowledge and understanding required for exam success without unnecessary detail. Each guide is designed to help students build confidence, reinforce key concepts, and revise effectively across the full ATPL syllabus.
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Performance – ATPL Revision Guide links certification rules and operational regulations to the practical “can we safely go?” decisions pilots make. It starts with performance legislation (CS-23 vs CS-25 and how performance classes drive different operating requirements) and the safety concept of measured vs gross vs net performance, where net figures include safety factors—so take-off/landing distances and climb gradients used operationally are more conservative than demonstrated values.
It then builds the core performance theory: definitions (angles vs gradients, ceilings, clearway/stopway, TORA/TODA/ASDA, screen height, range/endurance, specific range), and how variables like density altitude, wind, weight, configuration, runway condition/slope, CG affect thrust/power available and drag/power required. From that you interpret thrust/power curves for level flight, climb and descent, choose speeds for max range/endurance, and understand how engine failure reshapes climb capability (including gradients and drift-down concepts).
Finally, 032 splits into application by aircraft class: Performance Class B (CS-23) focuses on single- and light multi-engine performance—take-off/landing effects, wind components, obstacle clearance, and using POH-style graphs to find limiting masses, distances, climb and landing data. Performance Class A (CS-25) covers transport-category take-off (V-speeds, balanced/unbalanced field, accelerate-stop, contaminated runway/hydroplaning, brake energy/tyre speed limits, obstacle-limited flight path and RTOM/PLTOM tables/EFB outputs), plus cruise (optimum/step climbs, buffet boundaries, cost index), OEI drift-down, and landing/approach climb requirements and landing field length limits for dry/wet/contaminated runways.