What effective date should be used when changing a pilot's flying status code from "U" to "X" following graduation on 25 May?

The effective date for changing a pilot's flying status code from "U" to "X" following graduation on 25 May should be the same date as the graduation, which is 25 May. This ensures that the change in status accurately reflects the pilot's qualification and readiness to perform duties as of the moment they officially graduate. It is standard practice in aviation resource management to align status updates with significant milestones like graduation, as this allows for a clear and unambiguous record of the pilot's qualifications.

The other provided dates do not correlate with the point of graduation and could lead to confusion regarding the pilot's operational status. For optimal record-keeping and personnel management, it’s essential to have the effective date match the date on which the pilot completed their training and became eligible for a new status code.