Inspection is one of the most important parts of the process. Every single manufacturing stage is 100% inspected.

At the start of every operation, a first-off inspection is performed to ensure that the process is being carried our correctly. During the operation, routine patrol inspections are carried out, and at the end of the operation, every part is inspected. Any faults are noted on the batch route card and any necessary rework is carried out. Data on faults and rework is collected by the QA department and any patterns can be detected and corrected. This is known as statistical process control (SPC).