You exit controlled shipping by proving the defect is fixed with clean, verifiable data over a defined period, usually around 20 to 30 consecutive clean days with zero escapes. The plan below is how disciplined suppliers get off CS1 or CS2 without a second escape resetting the clock.
Step 1: Contain and stabilize
Before anything else, make sure no suspect part can reach the line. Isolate suspect stock at your plant, in transit, and at the customer, define clear inspection criteria and boundary samples, and start the redundant 100% inspection. A single escape during controlled shipping can restart your clean-day count, so containment has to be airtight first.
Step 2: Fix root cause, irreversibly
Clean days only count if the underlying cause is actually fixed. Drive a real root-cause analysis, put in irreversible corrective actions rather than temporary sorting, and verify the fix works before you rely on it. This is the step OEMs scrutinize most, because they have seen suppliers exit on containment alone and fail again.
Step 3: Build the clean-data package
Every shift, record quantities inspected, accepted, and rejected, with defect photos and a clean audit trail. This daily evidence is what proves control over the required window. A well-organized package, not just a claim, is what gets an exit approved the first time you ask.
Step 4: Request the exit
Once you have the required consecutive clean days with zero escapes and a verified corrective action, formally request release with the data package attached. Our crews build and maintain that evidence trail for you so the ask is credible. See our controlled shipping support for local, independent help.