Do not let the final reply on a Friday thread stand as sign-off. That reply simply fills the vacuum left when formal owners block their calendars and escalation rules still point to vacant inboxes.
The pattern repeats every week. A production change or supplier variation surfaces at 3:45 pm. The RACI matrix names three people. Two are in back-to-back meetings that spill past close of business. The third has auto-decline on every invite after 4 pm.
The thread continues because the system still needs an answer before the weekend freeze. Someone still online types the single word that unblocks the ticket. No one records that the decision bypassed the named owner.
Accountability then drifts. Next quarter the same class of change lands on the same desk because the earlier override was never logged against the correct role. The original owner later claims ignorance while the cost sits in their budget line.
The real failure sits in the escalation policy itself. Most policies assume every required approver remains reachable during business hours. They contain no clause for what happens when all listed owners become unreachable at the same time.
Teams fill the gap with informal conventions. The person whose calendar shows the fewest meetings after 4 pm becomes the de-facto Friday gatekeeper. Their title never changes and their bonus never reflects the extra exposure.
Fix the rule before the next reorganisation chart. State explicitly which single role carries authority when the published owners are unavailable, and require that substitution to be logged inside the same system that tracks the original request.
Measure the substitution rate weekly. When it exceeds single digits, the operating model already treats presence as more important than accountability. Adjust the model or accept that Friday decisions will continue to migrate to whoever happens to answer.