What is the difference between revalidating and renewing a rating?

Revalidation involves carrying out the procedure to maintain the vigor of the exercise of flight privileges. The revalidation procedure is always carried out before the rating expires.
Renewal means that the authorisation has expired and that the revalidation procedure has not been carried out in time and form. In this case, if you want to put your rating into force again, it will be renewed through an authorised training centre.

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