From: zili@home   
      
   Am 5 Dec 2005 02:45:23 -0800 schrieb "Proponent!!!N0_SP@M!!!@gmx.net":   
      
   >That's interesting.  It contains the following summary of reasons for   
   >choosing 5 PSI:   
   [...]   
   >"This pressure level was chosen as the best compromise to provide (1)   
   >necessary oxygen partial pressure, (2) efficient use of supply for   
   >emergency modes of operation, (3) a pressure offering small   
   >differential change during cabin decompression emergencies, and (4) a   
   >level for which decompression sickness would be minimal."   
   >The meaning of item (2) is not clear to me.   
      
   item 2 provides some reserve in case of a slow decompression, where   
   you are NOT instantly at the least survivable o2 partial pressure. You   
   just need some time to do emergency actions (plug a hole, close an   
   accidetial open valve or whatever else). And a bit higher pressure   
   might give you that time...   
      
      
   cu, ZiLi aka HKZL  (Heinrich Zinndorf-Linker)   
   --   
   "Abusus non tollit usum" - Latin: Abuse is no argument against proper use.   
      
   mailto: heinrich@zili.de   http://zili.de   
      
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