What must be serviced before flight if the crew oxygen is missing in an A320?

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In the context of the A320, if the crew oxygen is missing, it is essential to service the crew oxygen bottle before flight. The crew oxygen bottle contains the pressurized oxygen that is available for the flight crew's use in case of a cabin depressurization or a need for supplemental oxygen during emergencies. Ensuring that the crew oxygen bottle is fully serviced and operational is critical for the safety of the flight.

The other choices, while related to the oxygen system, do not directly address the immediate requirement to ensure that the crew has access to oxygen. For instance, the oxygen tank pertains to the larger system but is not the component that the crew would need to access directly in case of an oxygen shortage. Similarly, while the oxygen blowout disk and emergency oxygen mask play crucial roles in the overall oxygen system, they do not require servicing as a priority if the crew oxygen bottle is already missing. Ensuring the readiness of the crew’s oxygen supply takes precedence, making the servicing of the crew oxygen bottle the correct and necessary action before flight.

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