According to the release amendment procedures, what is NOT a reason for a revalidation?

In the context of release amendment procedures, a regular crew rotation change is not considered a reason for revalidation. Revalidation typically applies when there are significant alterations to the flight plan or operational parameters that could impact safety or compliance. These include route changes, flight delays that exceed a specific threshold, and changes to the aircraft's identity through tail number alterations.

Regular crew rotation changes, however, are standard operational practices that do not directly affect the safety or integrity of the flight release. Since crew members are frequently rotated as part of routine operations, these changes usually do not require revalidation. Therefore, this is the distinction that supports why regular crew rotation changes do not necessitate a reissue or revalidation of the release.