PASSENGER SERVICE UNITS ATTENDANT STATIONS
O G O G2
2
LAVATORIES
SERVICE UNITS
(2 MASKS)
(4 MASKS ON LEFT SIDE, CHEMICAL OXYGEN GENERATOR 3 OR 4 MASKS ON RIGHT O2G (IN EACH SERVICE UNIT)SIDE)
# As installed
Copyright . The Boeing Company. See title page for details.
1.40.6 December 1, 2000
Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Operations Manual
Flight Crew Oxygen System
The flight crew oxygen system uses quick–donning diluter demand masks/ regulators located at each crew station. Oxygen is supplied by a single cylinder. Oxygen pressure is displayed on the indicator located on the aft overhead panel when the battery switch is ON. Oxygen flow is controlled through a pressure–reducing regulator to supply low pressure oxygen. Normal pressure is 1850 psi.
The mask/regulator is stored in a box immediately adjacent to each crew station. To use the mask, squeeze the red Release Levers with the thumb and forefinger and remove from stowage. Squeezing the Release Levers:
.
inflates the mask harness
.
momentarily displays the yellow oxygen flow indicator
Place the mask over the head and release the levers. The harness contracts to fit the mask to head and face.
Oxygen flow is controlled by a regulator that is mounted on the oxygen mask. The regulator may be adjusted to supply 100% oxygen by pushing the NORMAL/100% Selector.
The observer’s oxygen mask, regulator, and harness unit is the same as the pilots’. Oxygen is available to the regulator when the flight deck shutoff valve is open. The unit does not have a flow indicator or reset–test button. The mask, regulator and harness are contained in a stowage cup.
Flight Crew Portable Oxygen (as installed)
The flight crew portable oxygen unit is a completely self–contained oxygen system, offering both demand and constant flow capabilities. It consists of a portable oxygen cylinder, a pressure regulator (constant flow), an on–off valve, a pressure gauge to show oxygen supply, a demand regulator, and a sling–type carrying strap.
The portable oxygen cylinder is installed behind and adjacent to the First Officer’s seat. When charged to 1800 psi at 70° Fahrenheit (21 ° Celsius), it contains 11 cubic feet (311 liters) of free oxygen.
The demand regulator has a connection for a demand type full–face mask and supplies 100% oxygen. Normally, the full face mask is attached to the unit and provides portable full–face and respiratory protection from hazardous smoke and fumes.
For constant flow oxygen, a bayonet–type fitting accommodates a disposable continuous flow mask. The cylinder provides oxygen for a duration of approximately 103 minutes using the 3 liter constant flow outlet.
Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Operations Manual
Flight Crew Portable Oxygen Equipment
ON-OFF VALVE
PRESSURE REGULATOR (YELLOW) PRESSURE GAUGE
FULL-FACE MASK DEMAND REGULATOR
OXYGEN
CYLINDER
Alt IF DEMAND FLOW 11 Cu. Ft. Cylinder FOR 100% OXYGEN 1. TURN YELLOW KNOB OPEN
(Feet) or OUTLET IS USED Estimated Duration (DEMAND FLOW) USE FULL FACE 2. ATTACH FULL FACE MASK TO LARGE OUTLET.
Cabin Alt. Equiv. in minutes* Mean Min. Max. MASK 3. APPLY MASK TO FACE (TIGHTEN LOWER STRAPS FIRST)
0 5,000 10,000 15,000 21 25 31 37 12 15 18 22 7 9 11 13 FOR SUPPLEMENTAL OXYGEN (CONSTANT FLOW) 2. ATTACH MASK HOSE TO SMALL CONSTANT FLOW OUTLET 1. TURN YELLOW KNOB OPEN
20,000 46 27 16 USE REBREATHER 3. APPLY REBREATHER TYPE MASK
25,000 57 33 20 TYPE MASK TO FACE
30,000 71 41 25
*Estimated duration based on an
assumed use rate of 14 LPM-ATPD
(sedentary), 24 LPM-ATPD (normal
activity), 40 LPM-ATPD (severe
activity).
Portable Protective Breathing Equipment
Protective Breathing Equipment (PBE/Smoke Hood) devices for crew use (for combating fires and/or entering areas of smoke or fume accumulation) are stowed throughout the airplane. The device is placed over the head and, when activated, provides approximately 15 minutes of oxygen. Manufacturer’s operating instructions are placarded on the container.
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