What does 'PDI' stand for in relation to portable oxygen bottles?

The term 'PDI' stands for 'Pre-Deployment Inspection' in relation to portable oxygen bottles. This inspection is crucial for ensuring that the oxygen equipment is functioning properly before it is used in a flight scenario. The pre-deployment phase is focused on verifying the condition and readiness of the oxygen bottles, allowing the crew to address any potential issues before they need to be deployed in an emergency situation.

Conducting a pre-deployment inspection helps ensure safety and compliance with aviation regulations. This process typically includes checking for physical damage, verifying pressure levels, and ensuring that all components are properly secured and functioning as intended. By identifying any deficiencies or malfunctions in advance, the crew can take the necessary steps to ensure the equipment is safe for use, as portable oxygen systems are critical in providing supplemental oxygen to passengers and crew in case of cabin depressurization or medical emergencies during flight.