How many days must changes be followed by a change transmittal or revision to the basic instruction after an Interim message change is issued?

The correct answer is 90 days. When an Interim message change is issued, it serves as a temporary update to the basic instruction, allowing for immediate dissemination of necessary changes. However, it is critical for these changes to be formalized and documented properly in order to maintain clarity, organization, and compliance with established procedural standards.

Within 90 days of issuing the Interim message change, a change transmittal or a revision to the basic instruction must be provided to ensure that the alterations are officially incorporated into the existing documentation. This timeframe allows for sufficient time to review, edit, and finalize the comprehensive updates needed in the instructional material, ultimately ensuring that personnel are following the most current and accurate guidelines.