Airliner pressurisation limits
Had a small pressurisation issue today - the differential was slightly above the limit in the flying manual - we descended and it came within limits again so carried on, although reported it in the tech log.
It had me wondering what sort of safety factor airliners have? Our limits are 8.6 PSI +/- 0.1 and we were at 8.8 PSI. Now I know we were nowhere near breaking apart, but how far from the ultimate limit were we?
I'm thinking that the limit is set for fatigue life in the main and a few overpressures won't make us pop, there's the relief valves too - but it had me pondering.
Thanks for replies in advance.