What is the maximum ambient air temperature approved for takeoff and landing?

What is the maximum ambient air temperature approved for takeoff and landing?

• A. ISA +25C
• B. ISA +35C
• C. ISA +45C
• D. ISA +15C

Answer: (B)

The maximum ambient air temperature for takeoff and landing is ISA plus 35°C. This means the operating envelope for these performance calculations is certified up to 35 degrees Celsius above the standard atmosphere. Since ISA at sea level is 15°C, the practical maximum is 50°C. Higher temperatures reduce air density, which lowers engine thrust and lift and can lengthen takeoff distance or affect braking and climb performance. The performance data used for takeoff and landing are validated only up to this limit, so operating above it isn’t within the certified envelope.

The maximum ambient air temperature for takeoff and landing is ISA plus 35°C. This means the operating envelope for these performance calculations is certified up to 35 degrees Celsius above the standard atmosphere. Since ISA at sea level is 15°C, the practical maximum is 50°C. Higher temperatures reduce air density, which lowers engine thrust and lift and can lengthen takeoff distance or affect braking and climb performance. The performance data used for takeoff and landing are validated only up to this limit, so operating above it isn’t within the certified envelope.