Disturbing systems that are meant to be left alone usually has some undesirable hidden consequence.
Very true. And hence "Disturbed Systems Testing", which I assume was in the RTI and fully worked up during the many mandated configuration milestones.
downsizer
Can't self certify seat work.
Thank you. The regs say you can't self certify modifications and changes, but it is common practice! They also say you can't fit a safety critical system without a valid Certificate of Design. Is there a valid CoD if there was no safety case to be found? The two are inextricably linked. There is much missing from what we are being told about this one.
The recurring systemic failure that this case highlights, yet again, is that it has become the norm not to verify functional safety. This was waived many years ago, and was directly responsible for e.g Tornado/Patriot (2003). One of the last posts on the Spry thread noted the wrong definition is now used by MoD! That's what happens when you stop teaching and doing it. Very similar to the points made by Camlobe about seat training.