Standard pressure and temperature

[Eric Fletcher S.O.C.]

> <<<can you even *breathe* at 0.5 bar???  Just barely.  In an unpressurized
> aircraft, a pilot must breath supplemental oxygen above 10,000 feet but a
> passenger is nor required to breath supplemental oxygen until 12,000.


Nope sorry the Regs for supplemental oxygen reads:

91.211 Supplemental Oxygen

 (a) General. No person may operate a civil aircraft of
     U.S. registry ‹

     (1) At cabin pressure altitudes above 12,500 feet (MSL) up to
         and including 14,000 feet (MSL) unless the required minimum
         flight crew is provided with and uses supplemental oxygen for
         that part of the flight at those altitudes that is of more
         than 30 minutes duration;

     (2) At cabin pressure altitudes above 14,000 feet (MSL) unless
         the required minimum flight crew is provided with and uses
         supplemental oxygen during the entire flight time at those
         altitudes; and

     (3) At cabin pressure altitudes above 15,000 feet (MSL) unless
         each occupant of the aircraft is provided with supplemental
         oxygen.


Just setting the record straight.  BTW it is suggested that you should go
onto O2 at 5,000 feet at night to preserve night vision.



Eric Fletcher
'00 S4tt
PPSEL/IA