Performancetake-off performance
Balanced Field Length
Balanced field length is a condition where the Take-off Distance Required (TODR) to clear a specified obstacle following an engine failure at decision speed (V1) is exactly equal to the Accelerate-Stop Distance Required (ASDR). It is used to optimise take-off weight for a given runway length, ensuring neither the go nor the stop case is more limiting than the other.
Key Points
- •Balanced field length is used to maximise take-off weight on shorter runways.
- •It involves balancing critical speeds including V<sub>1</sub>, V<sub>R</sub>, and V<sub>2</sub>.
- •When the field is balanced, the required runway length is minimised to satisfy both the continued take-off and the rejected take-off requirements simultaneously.
Exam Relevance
Critical for understanding multi-engine performance and V-speed calculations on transport category aircraft.
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