The maximum air temperature for takeoff is what value?

The maximum air temperature for takeoff being ISA +35 degrees Celsius is based on the aircraft's performance limitations and safety margins. This temperature threshold is established to ensure that the aircraft can achieve the necessary climb rate and maintain appropriate engine performance during takeoff, especially in high-density altitudes where the air is thinner.

Operating above this temperature can adversely affect the aircraft's aerodynamic lift and engine efficiency, leading to extended takeoff rolls and reduced climb capability. The specific value of ISA +35 degrees Celsius is derived from thorough testing and calculations that take into account the aircraft's design, weight limits, and environmental factors.

In contrast, values higher than ISA +35 degrees Celsius would generally push the aircraft beyond its operational performance limits in terms of engine output and takeoff distance, which is why they are not considered safe for takeoff operations. Thus, adhering to this maximum temperature is crucial for ensuring safe and efficient flight operations.