It's one per fifty seats. If it works out to one per door on certain aircraft it's strictly coincidental.
MK
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Uh, you are wrong... I am looking at my AA FA manual. 8 FA min for 777-200. One per door. AA and FAA an agreement of 10 min FA crew for the 777-300. One per door agreement has overridden the 1/50 rule... Apparently, one per door is more important than the ratio requirement!