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Refer to figure or CAP758 figure 2.23.
Given the following information, determine the maximum IAS and the specific range.

Pressure altitude: 4000 ft
Gross mass: 1900 lb
3200 engine RPM
No Muffler

  • A

    115 mph; 6.2 SM/gal

  • B

    112 mph; 5.2 SM/gal

  • C

    99 mph; 6.2 SM/gal

  • D

    102 mph; 5.8 SM/gal

Refer to figure.
Note: VH or VMAX is the Max Continuous Power (MCP) speed. It is found at the intersection between the power available and power required curves, where the power margin is zero, since no further power is available to accelerate the helicopter in level flight. It is the highest sustainable airspeed (subject to VNE) while flying straight and level.

1. Determine the maximum IAS from figure 2.23

  • Use the RH graph.
  • Enter from the intersection between the VH line and the 1900 lb TAKE-OFF GROSS MASS curve.
  • Move vertically down and read the maximum indicated airspeed: 102 mph.

2. Determine the specific range from figure 2.23

  • Use the RH graph.
  • Enter from the intersection between the VH line and the 1900 lb TAKE-OFF GROSS MASS curve.
  • Move horizontally to the right and read specific range: 5.8 SM/gal.

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