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Refer to figures.
If we assume a constant environmental lapse rate, what ISA deviation would be expected at FL140 over the northern coast of Iceland, as indicated in the annexes within the boxed regions?

  • A

    ISA -7°C

  • B

    ISA -8°C

  • C

    ISA -9°C

  • D

    ISA -12°C

At FL100, the ISA deviation is ISA-9°C: Calculated by considering the actual temperature of -14°C and the ISA temperature of -5°C (15 - 2 x 10).

At FL180, the ISA deviation is ISA-7°C: Calculated by considering the actual temperature of -28°C and the ISA temperature of -21°C (15 - 2 x 18).

  • Assuming a constant environmental lapse rate and being halfway between FL100 and FL180 at FL140, we would anticipate an ISA deviation of ISA-8°C.

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