DOC AIRBUS | AMM A320FCREW OXYGEN - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The flight-crew oxygen system gives protection to the eyes and respiratory system for the crew members.
It is used in the conditions that follow:
The system has three sections:
** ON A/C NOT FOR ALL The flight-crew oxygen system gives protection to the eyes and respiratory system for the crew members.
It is used in the conditions that follow:
- Loss of cabin pressurization (hypoxia protection)
- Smoke and poisonous fumes
- If one pilot remaining on station
- Pre-flight checks by the pilots.
The system has three sections:
- Oxygen storage (Ref. AMM D/O 35-11-00-00)
- Oxygen distribution (Ref. AMM D/O 35-12-00-00)
- Control and indicating (Ref. AMM D/O 35-13-00-00).
2. System Description
Two oxygen systems supply oxygen to the flight crew.
The equipment up to the inlet of each Low-Pressure (LP) oxygen-supply solenoid-valve is part of the two oxygen storage sub-systems.
For each oxygen storage sub-system, a fully isolated source supply line receives the LP oxygen from the pressure regulator/transmitter and supplies it to the LP oxygen-supply solenoid-valve.
The LP oxygen-supply solenoid-valve has an electrical shut-off function between the oxygen supply sub-system and the downstream crew distribution sub-system.
Each system is mechanically isolated from the other system. Thus, if there is a malfunction in one of the systems, this will not have an effect on the other system.
In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU, only the CREW SUPPLY pushbutton switch is for the two systems. Its function is to start or close the two systems at the same time.
The first system supplies oxygen to the Captain and Third Occupant stations, and the second system supplies oxygen to the First Officer station.
Two oxygen systems supply oxygen to the flight crew.
The equipment up to the inlet of each Low-Pressure (LP) oxygen-supply solenoid-valve is part of the two oxygen storage sub-systems.
For each oxygen storage sub-system, a fully isolated source supply line receives the LP oxygen from the pressure regulator/transmitter and supplies it to the LP oxygen-supply solenoid-valve.
The LP oxygen-supply solenoid-valve has an electrical shut-off function between the oxygen supply sub-system and the downstream crew distribution sub-system.
Each system is mechanically isolated from the other system. Thus, if there is a malfunction in one of the systems, this will not have an effect on the other system.
In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU, only the CREW SUPPLY pushbutton switch is for the two systems. Its function is to start or close the two systems at the same time.
The first system supplies oxygen to the Captain and Third Occupant stations, and the second system supplies oxygen to the First Officer station.
A. Oxygen Storage
(Ref. AMM D/O 35-11-00-00)
Two High Pressure (HP) oxygen cylinders supply oxygen to the flight crew.
The first HP oxygen cylinder is installed between frames 11 and 12 in the left part of the avionics compartment.
The second HP oxygen cylinder is installed between frames 16 and 17 in the left part of the avionics compartment.
Each HP oxygen cylinder can be filled through its filling port. The filling port is connected to the filling connector installed on the pressure regulator/transmitter.
The head of each HP oxygen cylinder has a direct connection to a pressure regulator/transmitter. These pressure regulators/transmitters supply LP oxygen to the distribution circuit.
The system includes an overboard discharge system for safety, if an overpressure occurs in the HP and/or in the LP oxygen lines of the system.
(Ref. AMM D/O 35-11-00-00)
Two High Pressure (HP) oxygen cylinders supply oxygen to the flight crew.
The first HP oxygen cylinder is installed between frames 11 and 12 in the left part of the avionics compartment.
The second HP oxygen cylinder is installed between frames 16 and 17 in the left part of the avionics compartment.
Each HP oxygen cylinder can be filled through its filling port. The filling port is connected to the filling connector installed on the pressure regulator/transmitter.
The head of each HP oxygen cylinder has a direct connection to a pressure regulator/transmitter. These pressure regulators/transmitters supply LP oxygen to the distribution circuit.
The system includes an overboard discharge system for safety, if an overpressure occurs in the HP and/or in the LP oxygen lines of the system.
B. Oxygen Distribution
(Ref. AMM D/O 35-12-00-00)
The oxygen is supplied to the flight crew stations through the distribution circuits that operate independently. The distribution circuit has the components that follow:
(Ref. AMM D/O 35-12-00-00)
The oxygen is supplied to the flight crew stations through the distribution circuits that operate independently. The distribution circuit has the components that follow:
- An LP solenoid supply-valve
- A distribution manifold
- LP stainless-steel distribution-pipes
- Supply hoses and stowage boxes
- Full-face/quick-donning oxygen-masks.
C. Control and Indicating
(Ref. AMM D/O 35-13-00-00)
The indicating system controls and monitors the crew oxygen system.
The DOOR/OXY page on the ECAM DU displays two pressures, one for the Captain's oxygen cylinder, and the second for the First Officer's oxygen cylinder.
In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU, there is one CREW SUPPLY pushbutton switch that activates the LP solenoid supply-valves in applicable oxygen storage sub-system.
An oxygen filling indicator is installed near filling port to give the HP filling pressure.
(Ref. AMM D/O 35-13-00-00)
The indicating system controls and monitors the crew oxygen system.
The DOOR/OXY page on the ECAM DU displays two pressures, one for the Captain's oxygen cylinder, and the second for the First Officer's oxygen cylinder.
In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU, there is one CREW SUPPLY pushbutton switch that activates the LP solenoid supply-valves in applicable oxygen storage sub-system.
An oxygen filling indicator is installed near filling port to give the HP filling pressure.
D. Crew Oxygen System
Crew Oxygen System