In what condition is supplemental oxygen required for the cabin crew?

Supplemental oxygen is required for cabin crew when operating above 10,000 feet due to the reduced oxygen levels at higher altitudes. The FAA regulations dictate that if the aircraft is at altitudes where the cabin pressure could drop, crew members must have access to supplemental oxygen to maintain their physiological safety and operational effectiveness. This threshold of 10,000 feet is significant because it marks the level at which there can be noticeable effects on cognitive and physical performance due to hypoxia, especially during prolonged exposure.

In contrast, operating below 10,000 feet does not typically necessitate supplemental oxygen, as the air pressure and oxygen levels are sufficient for normal breathing without supplemental assistance. Although there may be special cases or specific operational conditions that require oxygen, the standard requirement aligns with the 10,000-foot altitude mark. Thus, above this altitude, ensuring that cabin crew can maintain their performance and respond effectively in various situations becomes essential.