Final answer:
The cabin oxygen mask doors automatically open during an airplane emergency when the cabin pressure drops below a certain level, typically around 14,000 feet.
Step-by-step explanation:
The cabin oxygen mask doors automatically open during an airplane emergency when the cabin pressure drops below a certain level, typically around 14,000 feet. This triggers the oxygen mask system to release the masks, ensuring the safety and well-being of passengers.The cabin oxygen mask doors are designed to open automatically to provide quick access to oxygen masks in case of an emergency, such as a sudden loss of cabin pressure. This ensures that passengers have a reliable source of oxygen to breathe until the aircraft descends to a lower altitude where the air is breathable.It is important to note that the cabin oxygen mask doors will not open during routine flights or during normal cabin conditions. They are specifically designed to activate only under emergency conditions when the cabin pressure drops to a dangerous level.