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Refer to figure or CAP698 file 3.7.
Given the following conditions

OAT: 0°C
Pressure altitude: 18000 ft
Gross mass: 3750 lb
Mixture: leaned to 25° F rich of peak EGT
Other conditions as associated in the header of the graph.

What is the two engine rate of climb?

  • A
    1200 ft/min
  • B
    1050 ft/min
  • C
    870 ft/min
  • D
    500 ft/min

Refer to figure.
This is an odd graph where there are two sets of lines for each of the the three weights given, 3500lb, 4000lb and 4750lb (also note the uneven spacing). At higher altitudes each weight has a line for fully rich mixture and another for a mixture leaned to 25F of peak EGT. At lower altitudes only that for a fully rich mixture is given. This means that you need to identify the correct lines, full rich or leaned, and then interpolate between them.

Graphical solution = 1050 ft/min

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