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Charge pressure is indicated as follows:
.
Gauge on the bottle regulator
.
Gauge on the ground servicing panel
.
Oxygen quantity is indicated on the EICAS status page
When bottle pressure becomes excessive, approximately 2600 psi, all oxygen is vented overboard by a pressure regulator unit working in conjunction with a fuselage-mounted relief valve. Overpressure causes the OXY HP RELIEF disc, located on the left front fuselage to blow out.
The pressure regulator unit regulates flow to the crew mask regulator unit to 72.5 psi and the unit’s strain gauge transmits pressure signals to EICAS.
The crew mask/regulator unit regulates the flow to the crew masks. Oxygen is supplied via the regulator at either ambient or slightly over ambient pressure dependent upon crew setting of the flow controls.
The flight crew oxygen system is a diluter demand system. The flight crew oxygen masks are of the quick-donning, inflatable harness type. Each mask is stowed in a quick access container adjacent to each flight station (one each at the side consoles).
A regulator in each mask provides, by pilot selection, for three oxygen supply modes:
.
Normal diluted demand mode.
.
100 percent oxygen on demand mode
.
100 percent oxygen continuous flow/variable pressure mode (emergency mode).
When stowed in the container, the oxygen flow through the regulator can be tested by pressing the test lever. Each mask is equipped with a microphone.
Oxygen for the passengers is supplied by the same oxygen system as for the crew, via the altimetric valve to the passenger drop out mask boxes in the cabin, in the event of cabin depressurization.
The oxygen masks are installed in overhead compartments and are available at all passenger seats and in the lavatory.
All oxygen compartment doors will open to present the oxygen masks automatically, if cabin altitude reaches approximately 14,500 feet.
When the oxygen compartment doors open, the passengers will pull the oxygen mask to their face, pulling the lanyard and pin from the generator. This initiates the flow of oxygen to the passenger’s oxygen mask.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
INDICATOR
RATE NOT TO EXCEED 200 PSI/MIN TO "FULL" PRESSURE OXYGEN CYLINDER SERVICING: CHARGE CYLINDER AT
AMBIENT TEMP ° F 100 80 60 40 20 0 .20 .40
FULL PRESS PSI 1990 1900 1805 1710 1620 1530 1435 1340
GROUND SERVICE PANEL PRESSURE GAUGE
GF0810_003
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
GF0810_004
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
Blinker
Shows yellow cross when oxygen is flowing or when harness is inflated. When black, indicates no oxygen flow.
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