What is a requirement for the portable oxygen bottle's PDI?

The requirement for the portable oxygen bottle's PDI (Pre-Delivery Inspection) includes the verification of stowage. This means that the portable oxygen bottle must be securely stored and properly stowed in its designated location on the aircraft, ensuring that it is accessible in case of an emergency. Correct stowage is crucial for safety, as it prevents the bottle from moving around during flight or being misplaced, which could lead to complications if oxygen is needed urgently.

Other options do not accurately capture the primary focus of the PDI for this equipment. For instance, while it may be important for the mask to be set properly for emergency use, this detail does not pertain specifically to the PDI requirement itself. Additionally, the gauge reading should ideally be above a certain threshold, indicating sufficient oxygen supply, rather than below 3/4. The presence of a carry strap typically serves to enhance the handling and transport of the bottle; therefore, its absence might not align with the best practices for functionality and accessibility.