Which initial action is indicated by the Green Ring protocol for physiological symptoms?

Which initial action is indicated by the Green Ring protocol for physiological symptoms?

• A. Green Ring - PULL (As Required)
• B. Descend Below 10,000 feet MSL - Initiate
• C. OBOGS Supply Lever - OFF (Both)
• D. Return to level flight

Answer: (A)

When physiological symptoms appear, the first action is to ensure the pilot is getting enough oxygen. The Green Ring is designed to quickly engage the emergency oxygen system. Pulling the Green Ring activates or supplements oxygen delivery to the pilot, directly addressing the most common root of these symptoms—insufficient oxygen—so you stabilize quickly and buy time to manage the situation. Descending to a lower altitude or turning the oxygen off would not address the immediate oxygen shortfall and could make things worse if symptoms persist. Returning to level flight doesn’t fix the underlying issue either.

When physiological symptoms appear, the first action is to ensure the pilot is getting enough oxygen. The Green Ring is designed to quickly engage the emergency oxygen system. Pulling the Green Ring activates or supplements oxygen delivery to the pilot, directly addressing the most common root of these symptoms—insufficient oxygen—so you stabilize quickly and buy time to manage the situation. Descending to a lower altitude or turning the oxygen off would not address the immediate oxygen shortfall and could make things worse if symptoms persist. Returning to level flight doesn’t fix the underlying issue either.