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What is density altitude, and why does it matter operationally? start learning
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It is pressure altitude corrected for non-standard temperature; higher density altitude means lower air density and degraded take-off and climb performance.
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Which conditions most degrade take-off performance? start learning
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High mass, high temperature, high elevation/low pressure, tailwind, upslope and degraded runway condition.
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How does a headwind or tailwind affect take-off and landing performance? start learning
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Headwind reduces groundspeed for a given airspeed and generally shortens distance; tailwind increases groundspeed and distance significantly.
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How does runway slope affect performance? start learning
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Upslope generally increases take-off distance and reduces landing distance; downslope does the opposite.
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How does increased aircraft mass affect take-off, climb and landing performance? start learning
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It increases take-off and landing distances, reduces climb performance and requires higher operating speeds.
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Why does excess speed have such a large effect on landing distance? start learning
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Kinetic energy is proportional to mass × speed², so a small speed increase produces a disproportionately large increase in energy to dissipate.
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What is the practical difference between climb gradient and rate of climb? start learning
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Gradient is altitude gained per horizontal distance and is critical for obstacle clearance; rate of climb is altitude gained per unit time.
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What primarily determines climb gradient and rate of climb? start learning
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Gradient depends mainly on excess thrust/weight; rate of climb on excess power/weight.
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Why is OEI climb performance a major transport-aircraft limitation? start learning
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Losing one engine removes a large proportion of excess thrust, potentially making climb/obstacle performance limiting even though continued flight is possible.
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What is accelerate-stop versus accelerate-go? start learning
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Accelerate-stop covers accelerating and rejecting the take-off; accelerate-go covers continuing after the critical engine failure. Performance must satisfy the applicable available distances.
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What is the balanced-field concept? start learning
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A take-off condition where accelerate-stop and accelerate-go distance requirements are approximately equal.
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What is V1 operationally? start learning
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The take-off decision speed defining the boundary between stopping and continuing under the applicable certification/performance assumptions.
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Why is V1 not simply “the engine-failure speed”? start learning
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The critical failure is assumed at VEF before V1; V1 is the decision/action speed used in accelerate-stop and accelerate-go certification.
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start learning
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The speed at which rotation is initiated.
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start learning
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The take-off safety speed associated with required OEI climb performance after lift-off.
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Why must VR, V1 and V2 satisfy specific relationships? start learning
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They ensure controllability, lift-off capability and required continued-take-off performance after an engine failure.
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What is the purpose of reduced-thrust / assumed-temperature take-off? start learning
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To use less than maximum available thrust when performance permits, reducing engine wear while preserving required take-off margins.
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What is the difference between an assumed-temperature take-off and a fixed derate? start learning
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Assumed temperature reduces commanded thrust through performance calculation; a derate selects a lower certified thrust rating.
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What factors can limit maximum permissible take-off mass? start learning
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Structural mass, runway/field performance, climb performance, obstacle clearance and other aircraft-specific limits.
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What factors can limit maximum permissible landing mass? start learning
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Structural landing mass and landing-performance requirements.
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Why can brake energy become a take-off limitation? start learning
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A high-energy rejected take-off must not exceed the certified energy capability of the brakes.
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Why does brake-energy demand increase sharply with speed? start learning
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The kinetic energy that must be absorbed increases approximately with speed².
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What is the difference between gross and net take-off flight path? start learning
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Gross represents expected aircraft performance; net applies regulatory margins to provide obstacle-clearance assurance.
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Why can an obstacle limit take-off mass even when runway length is sufficient? start learning
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The aircraft may have enough runway to become airborne but insufficient climb performance to clear the obstacle with required margins.
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What is drift-down after an engine failure? start learning
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A controlled descent to an altitude where the aircraft can maintain the required OEI flight condition while preserving terrain clearance.
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What is the fundamental mass-and-balance relationship for CG? start learning
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CG position = total moment / total mass, using a common datum.
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What is a moment in mass and balance? start learning
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Mass or weight multiplied by its arm from the reference datum.
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start learning
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CG position as a percentage of the mean aerodynamic chord.
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Why must CG remain within the certified envelope? start learning
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To maintain adequate stability, controllability, trim capability and structural margins throughout the flight.
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What are the main operational effects of a forward versus aft CG? start learning
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Forward CG generally increases stability but trim drag and required control force; aft CG reduces trim drag but decreases stability and recovery margin.
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Why can an aircraft be within maximum mass but still unsafe to dispatch? start learning
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The CG can be outside limits even when total mass is acceptable.
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What is Maximum Zero Fuel Mass intended to protect? start learning
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Structural loads, especially wing-root bending caused by payload without the bending relief provided by wing fuel.
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Why can fuel burn change CG during flight? start learning
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Fuel is removed or transferred between tanks located at different arms.
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Why can passenger or cargo movement be operationally significant? start learning
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It changes aircraft moments and can move the CG outside the permitted envelope.
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What is the purpose of a load sheet? start learning
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To confirm actual or calculated aircraft mass and CG are within applicable limits for the flight.
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What is a Last Minute Change (LMC)? start learning
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An approved post-load-sheet change to payload or loading that must remain within defined mass-and-balance limits.
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Why must performance calculations use accurate aircraft mass? start learning
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Incorrect mass can produce incorrect take-off speeds, thrust settings and runway/climb performance.
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