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Refer to figure or CAP758 Figure 3.39.

Given the following information, determine the VTOSS:
Pressure Altitude: 2000 ft
OAT: +30°C
Take-Off Mass: 8600 kg

  • A

    45 kt

  • B

    51 kt

  • C

    41 kt

  • D

    52 kt

Refer to figure.
VTOSS for a rotorcraft, means the minimum speed at which climb of the rotorcraft is achieved with one engine inoperative, and the remaining engines are operating within the operating limits mentioned in the rotorcraft’s flight manual for a take-off.

At that speed, the ROC is at least 100 fpm with:

  • one engine inoperative;
  • one engine inoperative at 2½-min rating;
  • landing gear extended and air bleeds (heating, demisting, etc.) shut-off.

To determine VTOSS proceed with the following manner:

  1. Enter the left-hand vertical axis with the Pressure Altitude given, 2 000 ft.
  2. Move horizontally to the right until crossing the +30°C OAT line.
  3. Continue vertically down until intersecting the Take-Off Mass 8 600 kg (8.6 line).
  4. Finally, move horizontally to the left and read VTOSS : 51 kt.

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