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The Density Altitude:
  • A

    is used to establish minimum clearance of 2000 feet over mountains.

  • B
    is used to determine the aeroplane performance.
  • C
    is equal to the pressure altitude.
  • D
    is used to calculate the FL above the Transition Altitude.

Refer to figure.
The density altitude is used to assess an aircraft's aerodynamic performance under certain weather conditions.

The lift generated by the aircraft's airfoils, and the relation between its indicated airspeed (IAS) and its true airspeed (TAS), are also subject to air-density changes.

Furthermore, the power delivered by the aircraft's engine is affected by the density and composition of the atmosphere.

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