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The cabin pressurisation system of an aircraft fails above FL100 and the cabin altitude starts climbing slowly. What are the risks?

  • A

    A dense fog may form in the flight deck, degrading the flight crew’s visibility.

  • B

    Effects of hypoxia will be difficult to identify.

  • C

    Effects of hypoxia will be obvious.

  • D
    A door may blow out.

Slow, or gradual, decompression occurs slowly enough to go unnoticed and might only be detected by instruments. Causes of slow decompression can include a damaged door seal or cracked window. This type of decompression may also come about from a failure to pressurize as an aircraft climbs to altitude.

Crew members must be able to recognise the symptoms of hypoxia (lack of oxygen to the brain) in order to quickly identify a slow decompression. Symptoms of hypoxia include: headaches, nausea, yawning and occasional deep breaths.

The effects of lack of oxygen to the brain are very serious particularly as the brain is adversely affected without the person being aware of it.

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