B.3.4:1 - Problem Frame

Use this when. An earlier result is being relied on now, and a changed condition or a due review may change whether it still supports the receiving claim. Begin with the relied-on use and the premise that may have changed.

A bridge’s earlier assessment may remain applicable to its unchanged bounded use, while a new traffic load defeats that assessment before its scheduled review. A library result can remain applicable to unchanged dependencies yet fail to address a newly discovered relevant vulnerability. The age of either report does not distinguish these cases.

Practical gain. Reconsider the affected support in time to change the decision, while retaining useful results whose relevant premises still hold.

Ordinary boundary. Do not open a new assurance procedure solely because a carrier is older. If available information already establishes applicability for the immediate use, continue on that basis without a renewal or skip-refresh certificate. A real licence deadline, calibration qualification or promised-use window remains a condition of the actual use.