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How does increasing pressure altitude influence VMCA?

  • A
    VMCA is not affected by pressure altitude.
  • B
    VMCA increases.
  • C
    VMCA decreases.
  • D
    VMCA decreases only with increasing pressure altitudes above 4000 ft.

When an engine fails, the remaining engine still generates thrust and this causes the airplane to yaw away from the live engine.The amount of yaw is a function of the amount of thrust the live engine is generating, more the thrust from the live engine greater is the yaw.

The higher the air density, the more thrust that can be generated and therefore the more yaw that is generated when the engine fails, therefore the airflow over the rudder must be faster (increased VMCA) to make the rudder effective enough to counteract the yaw.

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