L61713
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35-22-41
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
C. Install the Switch
S 434-030
(1) Connect the air hose (if installed) to the hose adapter mounted on altitude pressure switch, S813.
NOTE: The air hose and hose adapter must have one-inch (25 mm) of
____
overlap to have a good connection.
S 424-015
(2)
Put the altitude pressure switch, S813 on the relay support bracket.
S 434-016
(3)
Install the screws, washers and nuts to secure the switch to the relay support bracket.
S 434-029
(4)
Connect the electrical connector to the altitude pressure switch, S813.
S 424-028
(5)
Install transformer rectifier no. 1 and 2 (TR1 and TR2) back on the E3-1 rack (AMM 20-10-07/201).
NOTE: Install other adjacent equipment that were also removed for
____
access, if applicable.
S 864-020
(6)
Unroll and secure the nylon moisture shroud above the E3 rack.
(7)
Supply electrical power (AMM 24-22-00/201).
S 714-035
(8)
Do this task "Passenger Oxygen System - Automatic Actuation Test", if it is necessary (AMM 35-22-00/501).
S 414-017
D. Put the Airplane Back to Its Usual Condition
S 714-021
(1) Close the main equipment bay access door (AMM 52-48-41/401).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
35-22-41
ALL ú ú 01 Page 405 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PORTABLE OXYGEN EQUIPMENT - DESCRIPTION AND OPERATION
_____________________________________________________
1. General_______
A. Oxygen for First Aid and sustaining purposes is kept in portable oxygen cylinders. These cylinders are installed at easily reached locations throughout the airplane (Fig. 1).
B. There are two types of portable oxygen cylinders, those with a demand regulator and those without a demand regulator. The basic cylinder assembly contains these parts: high pressure oxygen cylinder, constant flow pressure regulator, ON-OFF valve, relief valve, safety plug, charging valve, outlet assemblies, and pressure gage. A demand-type mask can be attached to cylinders with a demand regulator. (Fig. 2).
C. The pressure gage shows oxygen pressure in the cylinder and thereby the quantity of oxygen available. Cylinder pressure should be 1800 psig at 70°F. The safety plug contains a fusible alloy which melts in case of too much heat. This permits the cylinder to vent into the atomsphere. The ON-OFF valve controls the flow of high pressure oxygen into the pressure regulator.
D. The pressure regulator contains a pressure reducing mechanism which reduces the oxygen pressure before it is supplied to the outlet assembly or the demand regulator. The oxygen pressure is reduced because low pressure oxygen is required for the masks. The pressure regulator also has a recharging valve assembly which permits the cylinder to be refilled.
E. Outlet assemblies are connected directly to the constant flow pressure regulator. There are two outlet assemblies on each cylinder without a demand regulator and one on each cylinder with a demand regulator. Each outlet assembly contains an internal check valve, a flow metering device and an oxygen hose plug-in adapter. When a plug-in is inserted, it opens the check valve and permits oxygen to flow into a mask when the cylinder ON-OFF valve is open. The two outlet assemblies on cylinders without a demand regulator have flow rates of 2 liters per minute (LPM) and 4 LPM. The outlet assembly on cylinders with a demand regulator has a flow rate of 3 LPM.
F. On cylinders with a demand regulator, the regulator consists of a tilt valve, a diaphragm and a connection for a demand-type mask.
G. An oxygen mask and hose is attached to each portable oxygen cylinder assembly. For use, the hose must be connected to the oxygen outlet on the cylinder.
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