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An Operator is considering Johannesburg international airport as a new cargo destination. The aerodrome is at approximately 5500 ft above mean sea level, and in summer the temperatures can reach 30°C. What effect should the operator consider these conditions might have on the maximum landing mass compared to standard atmosphere conditions at an aerodrome at mean sea level?

  • A
    There is NO effect on landing mass because standard atmosphere conditions are used when calculating the maximum landing mass.
  • B
    The maximum landing mass would be lower because the actual landing distances would increase.
  • C
    The maximum landing mass would be the higher because the landing distances would decrease.
  • D
    Warmer ambient temperatures affect the landing distance but NOT the landing mass.

Aeroplane performance depends on a number of different variables, some of which cannot be influenced by the operator. These include environmental conditions such as aerodrome pressure and temperature.

Air density directly affects aircraft performance in terms of both aerodynamic and engine performance. As the density of the air increases (lower density altitude), aircraft performance increases. Conversely, as air density decreases (higher density altitude), aircraft performance decreases.

Higher temperature means lower air density at any given pressure altitude, extending both the take-off run and distance and lowering the performance-limited take-off mass for that day.

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