(d)
During oxygen flow a yellow cross appears on the flow blinker on the mask stowage box. During no flow conditions, the flow blinker is all black.
(e)
Depressing the harness inflation ears will inflate the mask harness. Donning the mask/regulator and releasing the harness inflation ears deflates the harness and allows the mask to conform to head shape.
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747-400 MAINTENANCE MANUAL
(f) Normal operation provides oxygen on demand and is obtained by rotating the PRESS TO TEST knob to normal (non-emergency) position and moving the oxygen dilution control to N. During the users inhalation phase, a pressure difference occurs across the demand diaphragm. This allows a valve to open and oxygen to flow to the user. The oxygen is diluted with cabin air. The amount of air is controlled by an aneroid which controls the oxygen/air ratio according to cabin altitude.
(3)
100 Percent Oxygen Mode
(a) With the mask/regulator being donned by the user, moving the oxygen dilution control to 100 percent and rotating the PRESS TO TEST knob to the normal (non-emergency) position provides a supply of pure oxygen to the user. Flow to the user is controlled on a demand basis by normal breathing.
(4)
Emergency Mode
(a) With the mask being donned by the user, moving oxygen diluter lever to 100 percent and rotating the PRESS TO TEST knob to EMERGENCY provides a positive flow of pure oxygen to the user. In this mode, flow to the user in not controlled by users inhalation cycle.
B. Control
(1)
With 28-volt dc power available at the battery bus, close the OXYGEN VALVE & IND circuit breaker on the P7 Overhead Circuit Breaker Panel and check the EICAS for system pressure.
(2)
Remove the mask/regulator from the mask stowage box.
(3)
Press the harness inflation ears on the regulator to inflate the harness. Continue to press inflation ears.
(4)
Flow blinker on mask stowage box shows a yellow cross indicating oxygen flow.
(5)
After a few seconds flow blinker turns all black indicating oxygen flow has stopped.
(6)
Don mask and release harness inflation ears. Mask harness will deflate and conform to head shape.
(7)
To operate the system using different modes of operation, the controls on the mask/regulator must be positioned as follows:
(a)
Normal mode 1) Oxygen dilution control at N. 2) PRESS TO TEST knob rotated to normal (non-emergency)
position.
(b)
100 Percent Oxygen Mode 1) Oxygen dilution control an 100 percent. 2) PRESS TO TEST knob rotated to normal (non-emergency)
position.
(c)
Emergency Mode
1) Oxygen dilution control at 100 percent.
2) PRESS TO TEST knob rotated to EMERGENCY.
(8)
When using the normal or 100 percent oxygen modes, oxygen should flow into the mask by normal breathing. In the emergency mode, flow to the mask is constant and not controlled by breathing.
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747-400 FAULT ISOLATION/MAINT MANUAL
CREW OXYGEN SYSTEM
COMPONENT SHT 102 FIG. QTY ACCESS/AREA AMM REFERENCE
AVERAGING UNIT - VOLTAGE, M992 1 1 FWD CARGO COMPT RIGHT SIDEWALL 35-11-12
BOX - MASK STOWAGE 1 4 FLIGHT COMPARTMENT 35-11-18
CIRCUIT BREAKER - 1 FLIGHT COMPARTMENT, P7
OXYGEN VALVE & IND, C364 1 7D4 *
COMPUTER - (FIM 31-61-00/101)
EICAS INTERFACE UNIT CENTER, M7352 1
EICAS INTERFACE UNIT LEFT, M7353 1
EICAS INTERFACE UNIT RIGHT, M7351 1
COUPLING - ASSEMBLY 2 2 FWD CARGO COMPT RIGHT SIDEWALL 35-11-04
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