787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 1.40.9
Oxygen Systems
Two independent oxygen systems are provided, one for the flight deck and one for
the passenger cabin. Portable oxygen cylinders are located throughout the airplane
for emergency use.
Flight Deck Oxygen System
The flight deck oxygen system uses quick–donning masks and regulators located
at each of the flight crew and observer stations. System oxygen pressure is
displayed on the MFD STATUS display.
Flight crew and observer masks and regulators are installed behind oxygen mask
panels near each seat. Squeezing the red oxygen mask release levers and pulling
the unit outward releases the mask from stowage and:
• inflates the mask harness
• starts the flow of oxygen to the mask
• selects the mask microphone (the boom microphone is deselected)
The boom microphone can be reselected by closing the left oxygen panel door and
pushing and releasing the reset/test switch. This also shuts off oxygen to the mask.
The oxygen flow can be restored by opening the left oxygen panel door.
Crew Oxygen Mask Microphone Test
The oxygen mask microphone can be tested without removing it from the storage
box using the following procedure:
• select the FLIGHT interphone transmitter and set the speaker volume as
desired
• push and hold a MIC switch on either the audio control panel or the glare
shield
• push both the oxygen mask RESET/TEST switch and the
EMERGENCY/TEST selector
The sound of oxygen flowing is heard through the speaker, verifying microphone
operation.
Passenger Cabin Oxygen System
The passenger cabin oxygen system is supplied by gaseous oxygen stored in small
high pressure cylinders. The passenger and flight attendant oxygen masks and
gaseous oxygen cylinders are located throughout the cabin in passenger service
units (PSUs) fitted to the ceiling panels. Oxygen flows from a PSU cylinder when
any mask hanging from that PSU is placed over the nose and mouth. Normal
breathing initiates the oxygen flow. The system regulates the pressure and
distributes oxygen to the masks by providing small pulses of oxygen to the user
during inhalation. The oxygen cylinders are single use devices and once activated,
provides oxygen until the cylinder is depleted.
February 13, 2009
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