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Refer to figure or CAP758 figure 2.5.
What is the limiting mass to maintain the recommended take-off profile and avoid the H-V shaded areas at a density altitude of 2 200 ft?
  • A
    1 810 lb
  • B
    1 900 lb
  • C
    1 910 lb
  • D
    19 100 lb

Refer to figure.
The performance H-V graph in figure 2.4 is based on normal gross mass (2 050 pounds) and standard day conditions. For the graph conditions to remain valid for operations at higher altitudes, the maximum recommended gross mass is used, determined in Figure 2.5.

The reason that this gross mass is only recommended is that, if operations do not require flight close to the shaded areas, then it would be safe to operate at a higher gross mass.

To determine the recommended gross mass:

  • Enter with Density altitude 2 200 ft.
  • Move horizontally until the solid line.
  • Continue vertically down and read 1 910 lb.
That means that, for the H-V graph to be reliable at a density altitude of 2 200 ft, the maximum aircraft mass should be 1 910 lb.

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