-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------991WR1 CYLINDER-ASSEMBLY,OXYGEN 172 35-21-51 991WR2 CYLINDER-ASSEMBLY,OXYGEN 172 35-21-51 991WR3 CYLINDER-ASSEMBLY,OXYGEN 172 35-21-51 991WR4 CYLINDER-ASSEMBLY,OXYGEN 172 35-21-51 991WR5 CYLINDER-ASSEMBLY,OXYGEN 172 35-21-51 991WR6 CYLINDER-ASSEMBLY,OXYGEN 172 35-21-51
7520WR FILLING PORT OXYGEN 162 35-21-52 7521WR INDICATOR-OVERBOARD DISCH. 162 35-21-54 7621WR COMPENSATOR-THERMAL 162 35-21-53 7622WR COMPENSATOR-THERMAL 162 35-21-53 7623WR COMPENSATOR-THERMAL 162 35-21-53 7624WR COMPENSATOR-THERMAL 162 35-21-53 7625WR COMPENSATOR-THERMAL 162 35-21-53 7626WR COMPENSATOR-THERMAL 162 35-21-53
3. System Description
__________________ (Ref. Fig. 001) The passenger oxygen is kept in composite cylinders. The cylinders are installed between FR62 and FR64, behind the sidewall linings RH in the AFT cargo compartment. You can fill the system through the fill port 7520WR. The fill port 7520WR is installed on the oxygen fill panel on the AFT RH of the bulk cargo compartment. The thermal compensators 7621WR thru 7626WR are installed in the fill lines immediatly before the pressure reducers. They prevent dangerous increases of temperature when you fill the system. The unwanted oxygen is released overboard through the overboard discharge indicator 7521WR if the oxygen pressure:
-
In the oxygen cylinder assemblies or
-
In the low pressure part of the pressure reducers is too high.
Oxygen Storage System
Figure 001
CES 4. Component Description
_____________________
(Ref. Fig. 002)
A. Storage Cylinders 991WR1 thru 991WR6
(1)
The passenger-oxygen storage cylinders are made of composite material. They each have a capacity of 116.9 ft.3 (3.31 m3) Normal Temperature Pressure Dry (NTPD) at a pressure of 1850 psi (127.5530 bar). The capacity of each cylinder that can be used by the cabin attendants and passengers is 105 ft.3 (2.97 m3) NTPD.
(2)
The storage cylinders with the pressure reducers are connected together in parallel (Ref. 35-23-00).
(3)
The cylinder head valve has:
-An inlet/outlet valve
-
A slow-opening shutoff valve with a metal seat and poppet. The shutoff valve is used to isolate the oxygen in the cylinder from the oxygen system
-
A pressure gage which shows the correct cylinder pressure if the shutoff valve is open or closed
-
A high-pressure safety outlet to the overboard discharge line.
B. Fill Lines
The fill lines are made of corrosion-resistant steel. They connect the fill port to the cylinder assemblies.
C. Thermal Compensators 7621WR thru 7626WR
(Ref. Fig. 003)
The thermal compensators prevent dangerous increases of temperature when
you fill the cylinders. They are installed in the fill lines immediately
in front of the pressure reducers. They have:
-A tube
-An internal part with a large surface area and a high thermal inertia
D. Filling Port 7520WR
(Ref. Fig. 004)
The filling port lets you fill the oxygen cylinder assemblies from an
external oxygen source. The filling port has:
-
A flow restrictor to make sure that the pressure increases safely when only one cylinder is filled
-
A filter to prevent contamination of the system
-An external cap with a safety chain.
Oxygen Cylinder Assemblies
Figure 002
CES
Thermal Compensators
Figure 003
EFF : 401-499, 35-21-00 Page 5
Config-2 Aug 01/05
CES
Filling Port
Figure 004
EFF : 401-499, 35-21-00 Page 6
Config-2 Aug 01/05
CES
E. Overboard Discharge Indicator 7521WR
(Ref. Fig. 005)
(1)
The overboard discharge indicator makes a continuous surface with the outside skin of the aircraft. The overboard discharge indicator is connected to:
-
The high pressure outlet of the oxygen cylinder assemblies
-
The safety outlet of the intermediate line.
The overboard discharge indicator has:
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