Cannula fitting
EFOX PORTABLE OXYGEN SYSTEM

 The followind is an extract from the Flight Manual Supplement  for an  EFOX  Portable Oxygen System:
             REVISION 0                                            Page 1 of 9  
Introduction. 
The  EFOX  Portable  Oxygen  System  is  approved  for  providing  supplemental  oxygen  to  flight  crew
and  passengers  in  this  aircraft. The  system  consists of a replaceable cylinder,  regulator  with
positive  shut-off  outlets, restraint harness,  Nasal  Dispenser  Assemblies  with connectors,
1 only dispenser covering  the  nose  and  mouth, and for systems approved to 25,000' only,
dispensers  covering the nose and mouth, fitted with microphones. 
SYSTEM COMPONENTS 
1. 'C' Size Oxygen cylinder as specified below. 
2. Regulator assembly Part No. EFR192Q4 
3. Harness assembly Part Nos. EFCH-1 and EFCH-2 
4. Nasal Dispenser assemblies Part No. EFNA3Q. ( 4 off) 
5. Dispenser Flowmeter assemblies Part No. EFNA4Q ( 2 off)* 
6. Mask Dispenser Scott Part No. 28301-10. 
7. Mask Dispenser Scott Part No. 28316-10.* 
8. Spare high pressure seals Part No. EFOXSC 
9. Sealable storage bags for 2,3,4,5,6,7 and 8.  
CYLINDER REQUIREMENTS 
The  following only may be used in this system: 
'C' size  Medical  Oxygen  cylinder.  
LIMITATIONS 1. Maximum operating altitude 18,000' using Nasal Dispensers.    
               Maximum operating altitude 25,000' using approved Masks fitted     
               to Dispenser Flowmeter Assemblies Part No. EFNA4Q. 
            2. Aircraft  must have functional cabin heater. 
               No passenger may occupy the same seat as the Oxygen System. 
               Note: The contents gauge must be visible to the pilot in  flight,  
               and   he  must be able to operate the cylinder valve  and  outlet  connectors. 
               Store dispensers in sealed bags in seat pockets.                         
 
EFOX PORTABLE OXYGEN SYSTEM  REVISION 0                                            Page 6 of 9 
Sample ENDURANCE calculation.  
A3 Flowmwter with OXYMIZER dispenser. 
The A3 flowmeter will supply the following flow at these altitude  settings, 
with an initial usable volume of 380 litres.                          
Dispenser Altitude setting  Flow rate.     Endurance in Hours         
          in feet             l/min.       No. of Oxymizers                            
                                         1     2    3     4 
  A3     10.000'                0.3      21.0 10.5  7.0  5.3 
         12,000'                0.4      15.8  7.9  5.3  4.0 
         14,000'                0.5      12.6  6.3  4.2  3.1 
         16,000'                0.6      10.5  5.3  3.5  2.6 
         18,000'                0.7       9.0  4.5  3.0  2.2                                    
                                            No. of Masks.                                   
                                          1     2    3    4 
Mask up to 18,000'              2.0       3.1  1.6  1.0  0.8  

A4 Flowmwter  with OXYMIZER dispenser, using  the  LEFT  (Oxygen  Conserving Cannula) scale. 
The  A4 (Left Scale) flowmeter will supply the following flow  at  these  altitude  settings, 
with an initial usable volume  of  380  litres. 
                          
Dispenser Altitude setting  Flow rate.      Endurance in Hours         
           in feet             l/min.         No. of Oxymizers                                      
                                           1     2    3    4 
  A4     10,000'               0.35       18.0  9.0  6.0  4.5  
         14,000'               0.57       11.1  5.5  3.7  2.7 

The A4 (Right Scale) flowmeter will supply the following flow  at  these  altitude  settings, 
with an initial usable volume  of  380  litres. 
                          
   Mask  Altitude setting   Flow rate.        Endurance in Hours          
          in feet             l/min.          No. of Masks.                                    
                                           1    2    3    4 
  A4       10,000'             1.0        6.3  3.1  2.1  1.5 
           12,000'             1.2        5.2  2.6  1.7  1.3 
           14,000'             1.4        4.5  2.2  1.5  1.1 
           16,000'             1.6        3.9  1.9  1.3  0.9 
           18,000'             1.8        3.5  1.7  1.1  0.8 
           20,000'             2.         2.8  1.4  0.9  0.7 

           18,000'             0.95       6.6  3.3  2.2  1.6  
A4  Flowmwter with MASK dispenser, using the RIGHT (Mask or  Std.  cannula) scale.
           24,000'             2.4        2.6  1.3  0.8  0.6 
           25,000'             2.5        2.5  1.2  0.8  0.6
 Note: B.O.C. 'C' size Medical Oxygen Cylinders Are now filled  to  480  litres, leaving about 460 l. usable.
 If using one  of  these  cylinders, endurances above increase by 20%.   

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