What action is required if the pressure indicator light is flashing red?

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A red flashing pressure indicator means a serious pressurization issue that needs immediate, coordinated action. Because the captain is responsible for the flight’s safety and for executing the correct emergency procedures, telling the captain right away ensures the flight deck can take the proper steps—such as donning oxygen, following the pressurization checklist, and planning for a safe descent or other required actions. Opening doors or attempting to reset the indicator would be unsafe and inappropriate in flight; doors cannot be opened mid-air, and resetting a warning can bypass safeguards and delay a proper response. Evacuation is not an immediate or general response to this warning; it’s only done under the captain’s instruction and at the right time on the ground. The captain’s timing and coordination are essential to managing a potential pressurization problem safely.