At what altitude does the maximum operating air temperature decrease from ISA +37°C to ISA +31°C?

The transition from the maximum operating air temperature of ISA +37°C to ISA +31°C at altitude reflects important performance considerations for aircraft, particularly regarding engine efficiency, aerodynamics, and safety margins. In the King Air 350, this temperature reduction occurs due to the decreasing air density and accompanying changes in engine performance as altitude increases.

At 35,000 feet, the atmospheric conditions and resultant air temperature are significant for ensuring the aircraft operates within safe temperature limits relative to the standard atmosphere (ISA). As altitude increases, the maximum ambient temperature that the aircraft can safely operate at systematically decreases, allowing for better engine operation and safeguarding engine components from overheating.

Understanding this altitude is crucial for pilots when planning flights, as it helps in maximizing performance while adhering to safety regulations. Operating at these specified temperature limits ensures that the aircraft maintains optimal performance without risking engine failure due to excessive heat. The choice of 35,000 feet specifically aligns with the design specifications and operational limitations defined in the aircraft’s performance manuals, further emphasizing the importance of adhering to such parameters.