What is the general maximum air temperature allowed for takeoff?

The maximum air temperature allowed for takeoff is significant because it impacts aircraft performance, including takeoff thrust, climb rate, and overall safety margins. The correct answer indicates that the maximum allowable temperature for takeoff is ISA +35 degrees Celsius.

This value is based on standard atmospheric conditions and performance limitations as documented in the aircraft’s operating manual. The reason for adhering to this specific temperature limit is that higher temperatures can reduce engine efficiency and increase the distance needed for takeoff due to decreased air density.

Performance calculations — including the takeoff distance required and climb performance — can be adversely affected by temperatures exceeding this limit, potentially leading to safety risks during takeoff. By adhering to the ISA +35 degrees Celsius limit, operators ensure that they remain within safe operational margins for the aircraft, resulting in optimal performance and safety during takeoff.

In comparison, the other temperature options either present a more lenient maximum or exceed operational limits, which could compromise aircraft performance and safety standards during critical phases of flight.