gianaameri
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If I were teaching the P2. I would consider improperly assembling the unit in this way and make my student remedy the problem pointing out all the things that just don't look right and fail a checklist in this condition. I do agree it is possible for this to happen again, but it seems like everytime the CCR manufacturer's builds a more idiot-proof machine...
Not really.
Fatalities due to incorrect assembly have only occurred on rebreathers which were poorly designed, that is they were non-compliant with Clause 5.1 of BS EN 14143: 2013 or BS EN 14143: 2003, which states:
It shall not be possible to assemble or combine the components or parts in such a way that it can affect the safe operation and safe use of the apparatus, e.g. by incorrect connection of the hoses to the breathing circuit.
At least that is true in this case.