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Refer to figure.
Have a look at the attached figure NET LEVEL-OFF ALTITUDE. Why are the temperature lines broken at 17 000 ft?
  • A
    The air condition is turned off below 17 000 ft.
  • B
    Usually there is an inversion at 17 000 ft.
  • C
    Fuel dumping can be started at 17 000 ft and above.
  • D
    The air condition it turned off above 17 000 ft.
In the figure you can see the information A/C OFF. This means that below 17 000 ft the air condition is turned off and therefore less performance is required from the remaining engine.

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