Alpinist V's OC bailout discussion successfully parked
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Selecting surface-hypoxic mixes if they are not required for the depth planned' is agreed as well.
PP02 of the diluent at least equal to the desired PP02 at the desired depth. This is the bit I don't like. Like you I have a LAR V background and whilst none of my Navy mates died from tox issues. I have seen enough incidents to warrant caution in my recreational diving as my civilian buddies don't look after my back the way a Navy dive team member does.
Moving away from O2 CCRs, taking the ability to do a cell verification or drop the pO2 away from a diver is an unnecessary risk. Cells are the weakest part of every rebreather out there and I like every tool possible in verifying them. I plan my dil to be 0.1 lower than my planned pO2 for the max depth of the dive. Dud sensor info can be cross checked this way.
Also, if the dil has a higher than planned diving pO2 and there is an O2 leak, solenoid jam etc you are forced to breath it down. Fine if one can ascend granted but a bit too much pucker factor if it isn't a option for a while
Fred Evans fitted and drowned. His sensors were current limited so his pO2 was higher than he believed it to be.