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Which hazard arises during a helicopter night flight in blowing snow?

  • A

    Engine monitoring displays are scanned with increased attention.

  • B

    Anti-collision light and rotors can cause the "flicker vertigo".

  • C

    High partial pressures in the human body can cause hyperventilation or autokinesis.

  • D

    High air pressure and low temperatures can clog the "eustachian tube".

Flicker vertigo in aviation is a condition triggered by exposure to flashing lights at certain frequencies, typically between 4 and 20 Hz. This phenomenon can cause symptoms such as dizziness, nausea, headache, and disorientation in pilots and passengers. Flicker vertigo is often induced by rotating helicopter blades or propellers that create intermittent light patterns.

Key Points:

  • Causes: Rapid flashing lights, such as sunlight flickering through rotating blades.
  • Symptoms: Dizziness, nausea, headache, and disorientation.
  • Prevention: Use sun visors, avoid looking directly at flickering light sources, and ensure proper cockpit lighting.

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