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Which one of the following reasons below define the VNE as an operating limitation?

1. Aerodynamic limitation.
2. Structural limitation.
3. ATC limitation.
4. Engine performance limitation.
5. Noise level limitation.

  • A

    1 and 2

  • B

    1 and 3

  • C

    3 and 4

  • D

    1 and 5

Refer to figure.
The "Never-exceed speed", denoted as VNE, may not be exceeded under any circumstances, even in a dive.

This speed is almost always designated by a heavy red line on the aircraft’s speed indicator and, if exceeded, could result in poor handling qualities and even damage the helicopter.

Reasons that define the VNE as an operating limitation are aerodynamic and structural limitations, such as:

  • Retreating Blade Stall
  • Airflow Reversal over the root of the retreating blade
  • Cyclic Range
  • Compressibility effect

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