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> >From:    Private_User@fo*.
> 
> [snip]
> 
> >In the old days the rule was PPO2 of 2.0 at approx 256' on air was ok.
> 
> I'm confused by this too.  I work 256' on air to be 1.839 ATA PP02.
> 
> [(256/33) + 1] * .21 = 1.839, right?
> 
> Can someone confirm or deny this?
> 
> Thanks,
> Scott.

Confirm. 

As I remember from "The Old Days" you figured your air to be 20%, 
PpO2 of 2.0 was 10ATA, 297 FSW.

At least that's what I learned in 1981. I guess it's not that much of 
"Old Days" compared to some.

I've never heard of 256FSW (I KNOW no one would dare say 256FFW) 
being a PpO2 of 2.0. Talk about new math...

Ken
--
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Ken Sallot                   "Sallot's law of patches - A person's diving
CIRCA                         ability is inversely proportional to how
(904) 392-2007                many patches(stickers) they have on their
kens@uf*.ed*                  jacket(car)"
http://grove.ufl.edu/~ken
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