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- 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.
- 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.
- 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.
- 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.
- 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
- 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
- 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.
- 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
- 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)
- 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
- activates when cabin altitude is above 28,000 feet.
- The Electronic Control Unit senses a fault in the system.
28,000 - BACK UP
30,000 REGULATOR GOES NORMAL to PRESSURE
- 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)
- 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 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.
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.