CHAPTER
35
Oxygen
CHAPTER 35
Oxygen
CH-SC-SU Subject Page Effectivity
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OXYGEN -INTRODUCTION
The oxygen systems supply oxygen to the flight crew, cabin attendants, and passengers.
Location
There are separate systems in the flight deck and passenger compartment. There are also portable oxygen units.
Abbreviations and Acronyms
*
AIMS -airplane information management system
*
CSS -cabin services system
*
EEU -ELMS electronics unit
*
EICAS -engine indicating and crew alerting system
*
ELMS -electrical load management system
*
MEC -main equipment center
*
MFD -multi-functional display
*
PSU -passenger service unit
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OXYGEN -INDICATIONS -STATUS PAGE
The status page shows oxygen pressure data.
You use the status display switch on the display select panel (DSP) to select the status page on the multifunction display (MFD).
Crew Oxygen
Crew oxygen pressure shows in units of psi. The display shows to the nearest 10 psi.
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CREW OXYGEN -INTRODUCTION
The crew oxygen system gives oxygen to the flight crew for emergencies and procedures that make its use necessary.
Component Locations
The crew oxygen masks and storage boxes are in the flight compartment.
The oxygen cylinder and the bleed valve are in the main equipment center (MEC).
The overboard discharge indicator is external, on the airplane skin.
The remote fill panel and fitting are in the forward equipment center.
General Description
The cylinder in the MEC holds pressurized oxygen. A line connects the cylinder to oxygen masks in the flight deck. A regulator at the cylinder and diluter/demand valves at the masks decrease oxygen pressure to the correct pressure for crew use.
The diluter/demand valve also mixes an applicable amount of flight deck air with the oxygen. The valve uses flight deck air pressure to make the decision on the quantity of oxygen to mix. The crew can also set the valve for 100 percent oxygen.
The remote fill panel and fitting lets maintenance personnel put oxygen in the cylinder while the cylinder is in the airplane.
You can get oxygen cylinder pressure information from the gages at the cylinder and remote fill panel, and from the primary display system (PDS).
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CREW OXYGEN -REMOTE FILL PORT
The remote fill port lets you fill the crew oxygen cylinder(s) on the airplane.
Location
The remote fill port is in the forward equipment center on the left side of the nose landing gear wheel well forward bulkhead.
Physical Description
The remote fill port has these components:
*
Cylinder starting pressure selector
*
Cylinder temperature selector
*
Pressure gage
* Fill fitting. A fill line connects the fill port to the oxygen cylinder(s). Training Information Point
The procedure to fill the cylinder is on a placard that is on the inside of the panel door.
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CREW OXYGEN -CYLINDER
The crew oxygen cylinder contains oxygen for the flight crew.
Location
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