What are the most critical conditions of takeoff performance?
The most critical conditions of takeoff performance are combinations of: High gross weight. High-density altitude. Contaminated runways.
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Flying in high density altitude conditionsFor pilots, high density altitude results in increased takeoff distance, reduced rate of climb, and increased landing roll distance. Failure to plan for these adjustments can result in an accident.
Pressure, temperature, and humidity have a great influence on aircraft performance because of their effect upon density. There is no rule-of-thumb or chart used to compute the effects of humidity on density altitude, but it must be taken into consideration.
Generally, it is the temperature of the rain that can affect take-off and landing. That is, if it is so cold that the rain turns into hail or snow, there could be a delayed or canceled flight. Airlines try not to cancel or delay flights as much as possible.