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* LEP-1  12/01/00 
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* Asterisk indicates page(s) revised or added by the current revision.
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OXYGEN SYSTEM
TABLE OF CONTENTS
OXYGEN SYSTEMS ............................................................................. 1
General............................................................................................ 1
Flight Crew Oxygen System............................................................1
Passenger Oxygen System.............................................................2
Portable Oxygen Cylinders..............................................................7

Sec. 17 TOC-2
MD-80 Rev. 12/01/00  #29 Continental Flight Manual
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OXYGEN SYSTEMS
General
Two independent oxygen systems are installed in the airplane:  one in the flight compartment for the flight crew and one in the passenger compartment for the passengers and cabin attendants.
The flight crew oxygen system provides oxygen to the flight crew members for normal sustained flight in the event of cabin decompression or for protection from the effects of smoke and harmful gases.  Oxygen for the flight crew is supplied from a supply cylinder located in the flight compartment.  The masks used with the crew oxygen system are oronasal with an integral microphone. The masks can also be used with the crew portable oxygen cylinder if necessary.  Smoke goggles are located at each of the flight crew stations.
Note: If goggles are required, they must be worn over the outside of the
mask.  This allows an oxygen flow into the goggles to clear any
existing smoke or fumes trapped in the goggles.
The passenger oxygen system supplies oxygen required during descent and recovery following high-altitude cabin decompression.  Oxygen for the cabin, lavatories, and attendant stations is supplied by self-contained chemical oxygen generating/dispensing units.
Portable oxygen cylinders are also provided in the flight compartment and cabin.  Passenger continuous flow type masks are attached to the cabin portable oxygen bottles.
Flight Crew Oxygen System
Oxygen for the flight crew system is supplied from a high-pressure gaseous oxygen supply cylinder.  The cylinder shutoff valve controls oxygen supply to the system.  The cylinder pressure regulator reduces the supply cylinder pressure to approximately 65 psi.
Oxygen flows from the pressure reducing regulator to the individual regulators/control panels at each flight station.  The pressure gauge of each regulator indicates the regulated pressure in the system.
Controls on the regulators permit the selection of different methods of supplying oxygen to the masks.  There are no controls on the mask itself.
Sec. 17 Page 2
MD-80 Rev. 12/01/00  #29 Continental Flight Manual
For normal operation of the system, the supply toggle must be in the ON position, with the diluter control and TEST MASK/NORMAL/EMERGENCY control in the 100% and NORMAL position respectively.  This supplies oxygen to the mask upon demand.  A dilution of oxygen with air is controlled by an aneroid within the regulator.  In the event of cabin decompression at altitudes above 28,000 feet, aneroids within the regulators automatically sense the change in cabin pressure and supply pure oxygen at a positive pressure to the masks by closing the air valve and overriding the demand valve.  For protective breathing purposes (smoke in the cabin, etc.) the diluter control must be in the 100% OXYGEN position.  This closes the air valve in the regulator, permitting only pure oxygen to reach the mask.
In the event of regulator failure, the diluter control must be placed in the 100% OXYGEN position and the TEST MASK/NORMAL/EMERGENCY control must be in the EMERGENCY position.  This feeds only pure oxygen to the masks.  The TEST MASK/NORMAL/EMERGENCY control is guarded by a safety pin which must be removed before the control can be placed in the emergency position.  The emergency position mechanically overrides the demand diaphragm in the regulator unit.  This position is basically a means of supplying positive oxygen pressure to masks if the automatic feature of the regulator fails.
The flight crew oxygen system has a thermal expansion discharge feature. The indicator is a green plastic disc and is located below the First Officer’s side window.  Absence of this disc requires inspection of the flight crew oxygen supply cylinder.
　
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