And don't forget, on an mCCR you need to add oxygen manually. There is an orifice in the Sidewinder, but normally you still have to add sometimes oxygen manually because you have to 'open' the orifice (by the intermediate pressure) on your metabolism. If you have stress, the metabolism will get higher. If the mav was somewere you cannot use it, then you have also a problem, even if you have a working ccr.