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Refer to figures or CAP 758 figures 1.1 and 3.2 for the Twin-Engine Turbine Helicopter (TETH).
Given the following information, what is the maximum take-off mass?

Pressure Altitude: 10 500 ft
OAT: +10°C

  • A

    7 150 kg

  • B

    7 000 kg

  • C

    12 300 kg

  • D

    7 500 kg

Refer to figures.
1. Firstly, using CAP 758 Figure 1.1, find the density altitude, correcting the pressure altitude for the given temperature:

  • Enter at the base of the graph with the OAT +10°C.
  • Move vertically up to the Pressure Altitude 10 500 ft.
  • Continue horizontally to the left and read Density Altitude: 12 300 ft.

2. Secondly, using CAP 758 Figure 3.2, determine the maximum take-off mass, depending on density altitude:

  • Enter with density altitude 12 300 ft.
  • Move horizontally to the right until crossing the solid line.
  • Continue vertically down and read the Maximum Take-off Mass: 7 150 kg.

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