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The temperature at FL140 is -12°C. What will the temperature be at FL110 if the ICAO standard lapse rate is applied:
  • A
    -6°C
  • B
    -9°C
  • C
    -18°C
  • D
    -15°C

In the standard troposphere air temperature on average decreases with height at an overall positive lapse rate of about 2ºC/1000 ft, until the tropopause, the boundary between the troposphere and stratosphere, is reached.

If the temperature at FL140 is -12ºC, we know that at FL110 it will be 6ºC warmer => ((14000 - 11000)/1000) x 2 = 6ºC

  • As discussed above, in the troposphere under normal circumstances, temperature increases with decreasing altitude=> temperature at FL110 = -12ºC + 6ºC = -6ºC

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