DOC AIRBUS | AMM A320FHYDRAULIC RESERVOIR FILLING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The reservoir filling system makes it possible to fill any of the three hydraulic reservoirs from one place. The supply of fluid can be a container or a pressurized ground hydraulic supply. Do not depressurize the hydraulic reservoirs.
** ON A/C NOT FOR ALL The reservoir filling system makes it possible to fill any of the three hydraulic reservoirs from one place. The supply of fluid can be a container or a pressurized ground hydraulic supply. Do not depressurize the hydraulic reservoirs.
2. Component Location
** ON A/C NOT FOR ALL 
Component Location (Sheet 1)| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 1007GM | COUPLING SOCKET | 197CB | 197 | 27-20-00 | |
| 1009GM | RSVR.FILL. HAND PUMP | 197EB | 197 | 29-16-42 | |
| 1131GM | CHECK VALVE G | 197CB | 197 | 29-11-04 | |
| 1132GM | HP FILTER | 197CB | 197 | 29-16-11 | |
| 1134GQ | RSVR.FILL.SEL.VALVE | 197CB | 197 | 29-16-51 | |
| 1698GM | HAND PUMP VALVE | 147 | 27-20-00 | ||
| 2131GM | CHECK VALVE B | 197EB | 197 | 27-20-00 | |
| 3131GM | CHECK VALVE Y | 198 | 27-20-00 | ||
3. System Description
Most of the components of the reservoir filling system are installed on the ground service panel of the Green system. The components which are not installed there are:
The self-sealing coupling socket is the connection for a pressurized ground hydraulic supply. There is a restrictor between the coupling socket and the selector valve. The restrictor protects the system against overpressure.
A high-pressure (HP) filter is installed upstream of the selector valve. The selector valve is a 4 port/4 way valve which gets fluid from the supply and sends it to the applicable reservoir. The selector valve also controls the power supply to the electrical contents indicator (Ref. AMM D/O 29-31-00-00).
The check valves isolate the low-pressure (LP) circuits of the main hydraulic systems from the reservoir filling system when it is not in use.
** ON A/C NOT FOR ALL Most of the components of the reservoir filling system are installed on the ground service panel of the Green system. The components which are not installed there are:
- the hand pump handle, which is the same one as is used for the hand pump of the Yellow hydraulic system. It is kept on the ground service panel of the Yellow system,
- the three check valves, which are installed in the supply lines to the reservoirs.
The self-sealing coupling socket is the connection for a pressurized ground hydraulic supply. There is a restrictor between the coupling socket and the selector valve. The restrictor protects the system against overpressure.
A high-pressure (HP) filter is installed upstream of the selector valve. The selector valve is a 4 port/4 way valve which gets fluid from the supply and sends it to the applicable reservoir. The selector valve also controls the power supply to the electrical contents indicator (Ref. AMM D/O 29-31-00-00).
The check valves isolate the low-pressure (LP) circuits of the main hydraulic systems from the reservoir filling system when it is not in use.
4. Component Description
A. Coupling Socket FIN: 1007-GM
The coupling socket is the connection for a pressurized ground supply of hydraulic fluid. It is installed on the ground service panel of the Green hydraulic system. With the socket, you can fill the hydraulic reservoirs.
The coupling socket is one half of a self-sealing quick-disconnect coupling. The other half is attached to the ground hydraulic supply. The assembly includes a check valve. There is a blanking cap, which is attached to the body of the coupling with a cable.
The coupling socket is the connection for a pressurized ground supply of hydraulic fluid. It is installed on the ground service panel of the Green hydraulic system. With the socket, you can fill the hydraulic reservoirs.
The coupling socket is one half of a self-sealing quick-disconnect coupling. The other half is attached to the ground hydraulic supply. The assembly includes a check valve. There is a blanking cap, which is attached to the body of the coupling with a cable.
B. Fill Valve 1698GM
The fill valve is the connection for the flexible hose. Use the flexible hose to fill the reservoirs with the hand pump from an unpressurized container.
The fill valve is installed on the suction connection of the hand pump. The valve assembly includes a check valve. The check valve makes sure that the fluid in the flexible pipe does not flow back into the container.
A blanking cap is included with the assembly. It is attached to the valve body with a nylon cord.
The fill valve is the connection for the flexible hose. Use the flexible hose to fill the reservoirs with the hand pump from an unpressurized container.
The fill valve is installed on the suction connection of the hand pump. The valve assembly includes a check valve. The check valve makes sure that the fluid in the flexible pipe does not flow back into the container.
A blanking cap is included with the assembly. It is attached to the valve body with a nylon cord.
C. Filter 1132GM
The filter of the reservoir filling system is installed on the ground service panel of the Green system. It is a HP filter with a filtration rating of 15 microns. It is made up of three main parts:
The filter head has the hydraulic connections, a clogging indicator and a shut-off device installed in it. The clogging indicator is mechanical; a red button comes out to show that the filter element is too dirty. The clogging indicator has a thermal lock which inhibits operation when the fluid temperature decreases to 0 deg.C (32 deg.F). The thermal lock releases when the fluid temperature increases to 30 deg.C (86 deg.F). You can push the button back in to set it again. There is no by-pass device on the filter in case of a blocked filter element.
The shut-off device operates when you remove the filter bowl and element. It makes sure that no fluid leaks out of the system and no air enters while the element is removed. The filter bowl is attached to the filter head. It holds the filter element.
The filter of the reservoir filling system is installed on the ground service panel of the Green system. It is a HP filter with a filtration rating of 15 microns. It is made up of three main parts:
- the filter head,
- the filter bowl,
- the filter element.
The filter head has the hydraulic connections, a clogging indicator and a shut-off device installed in it. The clogging indicator is mechanical; a red button comes out to show that the filter element is too dirty. The clogging indicator has a thermal lock which inhibits operation when the fluid temperature decreases to 0 deg.C (32 deg.F). The thermal lock releases when the fluid temperature increases to 30 deg.C (86 deg.F). You can push the button back in to set it again. There is no by-pass device on the filter in case of a blocked filter element.
The shut-off device operates when you remove the filter bowl and element. It makes sure that no fluid leaks out of the system and no air enters while the element is removed. The filter bowl is attached to the filter head. It holds the filter element.
D. Hand Pump 1009GM
The hand pump is installed on the ground service panel of the Green hydraulic system. It provides the flow of fluid to fill the reservoirs if a ground supply is not available. The hand pump is the same as the hand pump installed on the ground service panel of the Yellow system. The hand pump has two suction connections. One is for use when the pump is installed in the Green system, the other for installation in the Yellow system.
The hand pump is a two-stage type. It can supply 40 ml per stroke at low pressure (LP) or 10 ml per stroke at high pressure (HP). The hand pump operates in the LP mode up to 20 +5 -5 bar (290 +72 -72 psi). At that pressure, a pressure-operated valve opens and connects the two large chambers. Thus the supply comes only from the two small chambers. In the HP mode, the hand pump can supply fluid at 206 bar (3000 psi) nominal pressure.
The pump has a HP pressure relief valve which opens at between 234 and 237.5 bar (3400 and 3445 psi) . Also in the pump are eight check valves which control the flow of fluid between the chambers of the pump.
The hand pump handle is the same one as is used for the Yellow system pump. It is kept in the ground service panel of the Yellow hydraulic system. It is telescopic and is 540 mm (21.25 in.) long when it is extended and 325 mm (12.8 in.) long when it is retracted. The splined connection on the hand pump is made so that you can attach the handle only in the correct position.
The hand pump is installed on the ground service panel of the Green hydraulic system. It provides the flow of fluid to fill the reservoirs if a ground supply is not available. The hand pump is the same as the hand pump installed on the ground service panel of the Yellow system. The hand pump has two suction connections. One is for use when the pump is installed in the Green system, the other for installation in the Yellow system.
The hand pump is a two-stage type. It can supply 40 ml per stroke at low pressure (LP) or 10 ml per stroke at high pressure (HP). The hand pump operates in the LP mode up to 20 +5 -5 bar (290 +72 -72 psi). At that pressure, a pressure-operated valve opens and connects the two large chambers. Thus the supply comes only from the two small chambers. In the HP mode, the hand pump can supply fluid at 206 bar (3000 psi) nominal pressure.
The pump has a HP pressure relief valve which opens at between 234 and 237.5 bar (3400 and 3445 psi) . Also in the pump are eight check valves which control the flow of fluid between the chambers of the pump.
The hand pump handle is the same one as is used for the Yellow system pump. It is kept in the ground service panel of the Yellow hydraulic system. It is telescopic and is 540 mm (21.25 in.) long when it is extended and 325 mm (12.8 in.) long when it is retracted. The splined connection on the hand pump is made so that you can attach the handle only in the correct position.
E. Reservoir Filling Selector Valve 1134GQ
The reservoir filling selector valve directs hydraulic fluid from the supply to the reservoir of the system which is selected. The selector valve can be set in any one of four positions. They are one for each hydraulic system (YELLOW, BLUE or GREEN) and an off position (identified as NEUTRAL). A spring detent mechanism keeps the selector valve in its set position. The selector valve assembly has two main parts:
A thermal relief valve protects the selector valve from thermal expansion of fluid when it is in the NEUTRAL position. The thermal relief valve opens at 35 +5 -5 bar (507 +72 -72 psi) and closes at 20 bar (290 psi). The fluid released through the thermal relief valve goes out of a port connected to the Yellow hydraulic system.
The electrical switch unit is attached to the bottom of the hydraulic selector. The same shaft which operates the hydraulic selector also operates the hydraulic switch unit. A reduction gear (3:1) reduces the travel of the switch in relation to the input shaft. The switch assembly is made up of a double wafer and a double rotor. Together they make it possible to switch the five circuits to the four possible selections (N,Y,B,G). Seals are installed between the hydraulic and electrical parts of the selector valve assembly. They make sure that no fluid goes into the electrical switch mechanism, but goes out as external leakage.
The reservoir filling selector valve directs hydraulic fluid from the supply to the reservoir of the system which is selected. The selector valve can be set in any one of four positions. They are one for each hydraulic system (YELLOW, BLUE or GREEN) and an off position (identified as NEUTRAL). A spring detent mechanism keeps the selector valve in its set position. The selector valve assembly has two main parts:
- the hydraulic selector unit which controls the flow of fluid to the reservoirs,
- the electrical switch unit which controls the supply of power to the electrical contents indicator.
- A - supply inlet,
- B - outlet to the reservoir of the Blue hydraulic system,
- G - outlet to the reservoir of the Green hydraulic system,
- Y - outlet to the reservoir of the Yellow hydraulic system.
A thermal relief valve protects the selector valve from thermal expansion of fluid when it is in the NEUTRAL position. The thermal relief valve opens at 35 +5 -5 bar (507 +72 -72 psi) and closes at 20 bar (290 psi). The fluid released through the thermal relief valve goes out of a port connected to the Yellow hydraulic system.
The electrical switch unit is attached to the bottom of the hydraulic selector. The same shaft which operates the hydraulic selector also operates the hydraulic switch unit. A reduction gear (3:1) reduces the travel of the switch in relation to the input shaft. The switch assembly is made up of a double wafer and a double rotor. Together they make it possible to switch the five circuits to the four possible selections (N,Y,B,G). Seals are installed between the hydraulic and electrical parts of the selector valve assembly. They make sure that no fluid goes into the electrical switch mechanism, but goes out as external leakage.
5. Operation
A. With the Hand Pump
One end of the flexible hose is put into the fluid container and the other end is connected to the fill valve. Under the action of the hand pump, the fluid is drawn through the flexible pipe to the fill valve. The fluid goes through the filter and the check valve of the fill valve and into the hand pump.
It is pumped out of the hand pump through the HP filter to the selector valve. The fluid goes from the selector valve into the supply line of the selected reservoir (the other two reservoirs are isolated). The contents indicator shows how much fluid is in the reservoir and a light indicates which reservoir the selector is set to. The fluid flows through the supply line and the check valve to join the LP circuit of the system which is selected. From there it goes into the reservoir via the main system LP return lines.
One end of the flexible hose is put into the fluid container and the other end is connected to the fill valve. Under the action of the hand pump, the fluid is drawn through the flexible pipe to the fill valve. The fluid goes through the filter and the check valve of the fill valve and into the hand pump.
It is pumped out of the hand pump through the HP filter to the selector valve. The fluid goes from the selector valve into the supply line of the selected reservoir (the other two reservoirs are isolated). The contents indicator shows how much fluid is in the reservoir and a light indicates which reservoir the selector is set to. The fluid flows through the supply line and the check valve to join the LP circuit of the system which is selected. From there it goes into the reservoir via the main system LP return lines.
B. With a Ground Hydraulic Supply
The supply is connected to the self-sealing coupling and fluid under pressure flows into the filling system. It goes through the restrictor which decreases the pressure of the fluid. The fluid then flows through the HP filter to the selector valve. From there the operation of the system is the same as when the hand pump is used.
The supply is connected to the self-sealing coupling and fluid under pressure flows into the filling system. It goes through the restrictor which decreases the pressure of the fluid. The fluid then flows through the HP filter to the selector valve. From there the operation of the system is the same as when the hand pump is used.