SELF-GENERATING OXYGEN SYSTEM

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Author:
carLORENZ0
ID:
258003
Filename:
SELF-GENERATING OXYGEN SYSTEM
Updated:
2014-01-23 04:36:23
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  1. - it supplies an unlimited supply of breathing has to the flight crew. 


    + by diverting some bleed air from the engines and or the aux power unit (APU) 

    - back-up oxygen system had limited supply of 100% oxygen. 
    - Back-up Oxygen is used when MSOGS fails, when cabin alt. is ^ 28,000 ft or ON DEMAND. 

    + Is a high pressure gaseous oxygen system.
    Self Generating Oxy. Sys.
  2. - uses a liquid coolant to lower the temperature of the bleed air. 

    - Actual bleed air input temperature & pressure will vary with the mode of aircraft operation, altitude & humidity.
    Precooler
  3. - a swirl-type centrifugal separator, condenses the water in the bleed air after it has passed thru the pre-cooler.  

    + the water removed is then discharged overboard.
    -After the bleed air leaves the water separator it goes into the air filter.
    Water Separator/Extractor
  4. - prevents particles carried by the bleed air from teaching the oxygen concentrators. 

    - contains a removable 0.6 micron filterelement and a moisture drain. 
    + can be removed for clueing or replacing, 
    - has a differential pressure SW - which detects a difference in pressure, indicating either a blockage of the air filter or leakage in the pre cooler.
    Air Filter
  5. - two valves that bleed air passes through prior to entering the concentrators. 

    - Valve reduces the pressure to 55 PSI to the dix molecular sieve canisters.
    Pressure Regulating Valves
  6. - consist of two, three-bed molecular sieve oxygen generating units. 

    - similar in shape to a six pack of 16 oz. cans. 
    - inside canisters: zeolitic crystals :: that aborb the nitrogen from the bleed air. 

    + breathing gases only
    Oxygen Concentrators
  7. - prevents backup system oxygen from bleeding back through the concentrators. 

    - in case the back up oxygen system is activated. 
    + check valves may be found in many styles to meet the needs of the manufacturer.
    Check Valve
  8. - senses when pressure drops to 10 PSI or less. 

    + SW will close sending a signal to the oxygen caution light in the cockpit.
    Oxygen Low Pressure SW
  9. - a computer, which will monitor & control the entire oxygen system. 

    MSOGS & BACK UP 

    - if a fault is detected in the oxy sys. IT will deactivate the self-generating oxygen system & activate the back up oxygen system. 

    - when fault is corrected, IT will deactivate the back up oxygen sys. & reactivate the self generating oxy sys. 

    - Ensuring the crew always has some form of oxygen to breath. 

    MOSGS or BACK UP

    High pressure 100% GASEOUS OXY SYSTEM 

    for use 28,000 Cabin Altitude 
    or the MOSGS sys fails
    Electronic Control Unit (ECU)
  10. - supplies 100% gaseous oxygen to the user. 

    - this is a limited supply of gaseous oxy. 
    - is activated to the “ON’ position by opening the back up oxygen shutoff valve.
    - activated electrically, manually or by an aneroid.
    Back up Oxygen System
  11. - activates when cabin altitude is above 28,000 feet.
    Aneroid
  12. - The Electronic Control Unit senses a fault in the system. 



    28,000 - BACK UP

    30,000 REGULATOR GOES NORMAL to PRESSURE
    Electrically
  13. - By placing a switch located on the oxygen control panel in the cockpit to the back up position. Manual actuation is by a crew member placing the auto/manual control on the valve itself to the manual position.
    Manually (BACK UP OXY)
  14. - a pressure demand but it does not have a diluter feature.

    + mounted on the outboard side of each ejection seat & has two modes of operation. 
    + NORMAL & PRESSURE.

    - supply oxygen on demand
    Breathing Regulator
  15. breathing gas is supplied at 0 to 1.5 inches of water at sea level.

    - maximum output of 9 inches of water is reached as cabin altitude increases.

    - supplies breathing gas under pressure. 

    - continues flow reg. 

    @ 30,000 cabin altitude will automatically switch to ON DEMAND to PRESSURE.
    Pressure Mode
  16. breathing gas is supplied at minus 1.0 to 0 inches of water from sea level to 30,000 feet of cabin altitude. 

    -works just like a pressure demand type.
    Normal mode

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