So you knew that the person carrying out the end of line test sequence was completing it correctly, not having a bad day or disgruntled because they'd just had a rollicking from their manager because they weren't getting product out fast enough? You knew that all the test instrumentation they were using was connected properly and functioning correctly on every test? You knew that they didn’t accidentally scratch a unit or bend a bracket and send it out anyway to avoid repercussions from their manager? You knew that they weren't 'fudging' an occasional test result to keep production figures up? You knew that the forklift driver loading the lorry didn't damage a pallet and fail to report it, hoping that it wouldn't be noticed before it was unloaded on delivery?
I've seen failings in all of the above in manufacturing, and more. I concede that I've never worked in anything related to the caravan industry, maybe quality control is better than it is within other industries.
That is a very cynical view almost worthy of my self.....
Of course if anyone is intent on committing criminal damage or sabotage almost any system can be overcome. As far I know we did not have any disgruntled employees with any such intentions.
But what I can say with assurance the work force we had in our division were incredibly stable and turnover was very low principally just retirement.
The business had invested and became the first UK business in the LPG gas appliance industry to become accredited and maintaining to BS 5750 and later it successfully transitioned to BS EN 9001 covering design and production systems.
Unlike many other sectors Gas appliances designs cannot be self certified for CE or UKCA approval. They have to be assessed for compliance with relevant standards and regulations by an independent Test House. This includes the production methods used and ability to maintain traceability of supplies back through the supply chain.
The manufacturing process including warehousing used for our gas, electrical and mechanical products were all continuously reviewed and when possible revised to reduce/eliminate possible manufacturing faults. The risks of accidental damage had been designed out of our processes.
Ultimately the final testing of gas appliances was automated, and the serial number could only be produced when the UUT had passed all prescribed tests. It would not be possible for an operator to falsely produce a serial number. All the production test equipment was controlled through a QA system which regularly checked the calibration of all measurement systems used in the business, and several times a day products were taken from completed production for secondary and more detailed quality and reliability assessment.