Final answer:
The 'Cabin Pressure' aural warning in an aircraft is triggered when the cabin pressure altitude is too high, usually above 10,000 feet, posing a risk of hypoxia.
Step-by-step explanation:
The "Cabin Pressure" aural warning will be heard in an aircraft when there is a cabin altitude warning, meaning that the cabin pressure altitude has reached a point that is considered too high, generally above 10,000 feet, where there is a risk of hypoxia (oxygen deficiency) for the passengers and crew. Modern commercial aircraft are equipped with pressurization systems that are designed to maintain a cabin altitude of around 6,000 to 8,000 feet, even when the aircraft is flying at cruising altitudes of 35,000 feet or higher. When the pressure inside the cabin drops significantly due to a system malfunction or a breach in the aircraft's fuselage, the aural warning system will alert the flight crew to take corrective action. This could involve descending to a lower altitude where the air is thicker (and contains more oxygen), or troubleshooting the pressurization system to restore the correct cabin pressure.