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Refer to figure.
On the helicopter Power vs. TAS graph, Point D represents the true airspeed where the power available equals to the power required. If altitude increases, Point D…

  • A

    Decreases due to the reduced power available.

  • B

    Does not move because VMAX is a fixed speed.

  • C

    Moves to a higher airspeed due to the increased induced power.

  • D

    Disappears because the power required becomes greater at all speeds.

Refer to figure. 
The performance capability of a helicopter depends on the relationship between the power available and the power required. The greater the power margin, the better the performance.

The Power available depends on engine performance which depends on:

  • Pressure Altitude
  • Temperature
  • Humidity

The Power required depends on the above factors, plus All Up Mass.

With any increase in altitude, temperature and humidity, the powered required increases (moves up and right), and the power available decreases (moves down). Therefore, both curves are intersected at a lower speed and Point E decreases.

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