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Passenger Compartment
Dropdown masks installed above all of the passenger seats and in the lavatory provide
passenger oxygen. The passenger masks are fixed-dilution (free-flow) type, which
provides a mixture of oxygen and cabin air at ambient pressure. They are designed for
use at cabin pressure altitudes below 25,000 feet. When the passenger oxygen system
is active, the PAX OXY ON caution EICAS message is displayed.
Therapeutic
Provisions are made to install therapeutic oxygen ports in the passenger compartment.
This system is used for first aid and normally supplies oxygen to four ports (forward
left, aft left, forward right and aft right) at mid-height along the cabin.
Controls and Indicators
Overboard Discharge Indicator(s)
If the oxygen storage bottle pressure becomes excessive, all oxygen will be vented
overboard through a relief valve in the right forward fuselage.
Single-Bottle System
A green frangible disk located below and aft of the ground servicing panel will
fragment to indicate the relief valve has activated due to an overpressure. The relief
valve will activate when the HP module pressure exceeds approximately 2600 psi or
when the LP module pressure exceeds 130 psi.
Dual-Bottle System
In dual-bottle systems, there are two green frangible disks located below and aft of the
ground servicing panel to indicate that the relief valve has activated. One disk will
rupture if the HP module pressure exceeds approximately 2800 psi. The other disk will
rupture if the LP module pressure exceeds 90 psi.
In all cases, an amber OXY LO PRESS message will be displayed on the EICAS when
the oxygen pressure falls below 800 psi.
EMERGENCY EQUIPMENT
For Training Purposes Only
May 03
8-3
P I LOT T R A I N I N G GU I D E
Oxygen System Panel
Figure 8-1
BRT
FUEL TEMP
ENGINE
BULK
OXY
C ALT
RATE
P
70 75
1840
3200
200
SPOILERS -0.5
-4
1990
1900
1805
1710
1620
1530
1435
1340
100
80
60
40
20
0
-20
-40
OXY CYL SERVICING
CHARGE CYL AT
RATE NOT TO EXCEED
200 PSI (1379)
MIN. TO “FULL”
PRESSURE
FULL PRESS
AMBIENT
TEMP
STATUS PAGE
Bonding
Jumper
Refill Line
(High press.to
oxygen bottle)
Ground Service
Panel Indicator
Filler Valve Dust Cap and
Chain Assy
Oxygen Pressure
Green
Amber
- 800 psi and above
- below 800 psi
P604_08_007
Service Panel
13720
13100
12445
11790
11169
10549
9894
9239
PSI kPa
37.8
26.7
15.6
4.4
-6.7
-17.8
-28.9
-40.0
F° C°
EMERGENCY EQUIPMENT
8-4 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Flight Compartment
Oxygen for the flight crew is provided through a diluter demand regulating system. A
quick-donning, inflatable-harness mask is installed in a container at each side console.
Each container has a test lever, a yellow flow (eye) indicator, oxygen ON flag, a set of
quick-release doors and connections for the oxygen and communications lines.
Pressing the RESET/TEST switch can test oxygen flow through the regulator. The
flow indicator (blinker) displays a yellow cross when oxygen is flowing. The flow
indicator is black when there is no flow. When the mask is in use, a white ON flag
comes into view on the left door of the container to indicate that the oxygen shutoff
valve is open. When the mask is no longer required, closing the container doors and
pressing the RESET/TEST switch stops the flow of oxygen to the mask and removes
the white ON flag.
The crew oxygen masks have controls located on the mask. The controls have the
following selections:
Normal /100% Lever
• NORMAL – A diluted mixture of oxygen and ambient air adjusted for cabin
altitude
• 100% - Pure oxygen (100%) is delivered at a pressure dependent on cabin altitude
Emergency Flow Control Knob
• NORMAL (Unmarked) – Oxygen is regulated on demand
• EMERGENCY – A constant flow of oxygen is delivered at a positive pressure
• PRESS TO TEST (Momentary) – Purges the mask of smoke or noxious fumes
Microphone Control
Each mask has a microphone installed, which can be activated on the Audio Control
Panel by selecting MASK/BOOM MIC switch to MASK.
Inflatable Harness Control
The flight deck masks are designed to be removed from their containers and donned
　
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