DOC AIRBUS | AMM A320FGROUND INTERNAL LEAK TEST SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The ground internal leak test system makes it possible to check the internal leakage of specified parts of the hydraulic systems. It is necessary to measure the leakage to make sure that the system performance keeps in the specified limits. It is also possible to make sure of the condition of components during maintenance. A ground test rig and flowmeter are used to supply and measure the flow of fluid.
The ground internal leak test system makes it possible to check the internal leakage of specified parts of the hydraulic systems. It is necessary to measure the leakage to make sure that the system performance keeps in the specified limits. The ultrasonic flowmeter is used to measure the flow of the hydraulic fluid.
** ON A/C NOT FOR ALL The ground internal leak test system makes it possible to check the internal leakage of specified parts of the hydraulic systems. It is necessary to measure the leakage to make sure that the system performance keeps in the specified limits. It is also possible to make sure of the condition of components during maintenance. A ground test rig and flowmeter are used to supply and measure the flow of fluid.
The ground internal leak test system makes it possible to check the internal leakage of specified parts of the hydraulic systems. It is necessary to measure the leakage to make sure that the system performance keeps in the specified limits. The ultrasonic flowmeter is used to measure the flow of the hydraulic fluid.
2. Component Location
** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 1146GM | GRND SERV MANIFOLD | 146 | 29-19-41 | ||
| 2146GM | GRND SERV MANIFOLD | 195BB | 195 | 29-19-41 | |
| 3146GM | GRND SERV MANIFOLD | 196BB | 196 | 29-19-41 | |
3. System Description
System Description - Schematic ** ON A/C NOT FOR ALL
System Description - Schematic ** ON A/C NOT FOR ALL
The ground internal leak test system is divided into three parts, one for each of the Green, Blue and Yellow hydraulic systems. Each part has:
The ground internal leak test system is divided into three parts, one for each of the Green, Blue and Yellow hydraulic systems. Each system has:
When the Yellow electric pump starts because of the operation of the cargo doors, the movement of the flight controls is prevented. Electrical power is supplied to the leakage measurement solenoid valve of the Yellow hydraulic system and the two PTU solenoid valves. Thus no hydraulic power is supplied to the power transfer unit (PTU) and the flight controls.
** ON A/C NOT FOR ALL System Description - Schematic ** ON A/C NOT FOR ALL System Description - Schematic ** ON A/C NOT FOR ALL - a ground leakage-measurement manifold,
- a solenoid valve,
- a pushbutton switch in the cockpit.
The ground internal leak test system is divided into three parts, one for each of the Green, Blue and Yellow hydraulic systems. Each system has:
- A solenoid valve
- A pushbutton switch in the cockpit.
When the Yellow electric pump starts because of the operation of the cargo doors, the movement of the flight controls is prevented. Electrical power is supplied to the leakage measurement solenoid valve of the Yellow hydraulic system and the two PTU solenoid valves. Thus no hydraulic power is supplied to the power transfer unit (PTU) and the flight controls.
4. Power Supply
The ground internal leak test system gets electrical power from the DC system of the aircraft. The service bus 601PP supplies 28 V DC to each solenoid valve through the applicable pushbutton switch.
** ON A/C NOT FOR ALL The ground internal leak test system gets electrical power from the DC system of the aircraft. The service bus 601PP supplies 28 V DC to each solenoid valve through the applicable pushbutton switch.
5. Component Description
A. Ground Leakage-Measurement Equipment FIN: 1146-GM FIN: 2146-GM FIN: 3146-GM
Ground Leakage-Measurement Manifold ** ON A/C NOT FOR ALL
Ultrasonic Flowmeter ** ON A/C NOT FOR ALL
Ground Leakage-Measurement Manifold ** ON A/C NOT FOR ALL Ultrasonic Flowmeter ** ON A/C NOT FOR ALL (1) Ground Leakage-Measurement Manifolds
There are three ground leakage-measurement manifolds. One is installed in each hydraulic system. All three manifolds are the same.
The manifold has two pairs of inlet ports (2 are identified as A and 2 are identified as B) and three outlet ports (identified as C, D and E). Only one inlet port from each pair is used, the ports which are not used are sealed.
In the manifold there are three check valves and three 2/2-way valves. All of the valves are spring loaded poppet type valves. The 2/2-way valves are manually operated. They are only selected to open for ground maintenance tasks.
There are three ground leakage-measurement manifolds. One is installed in each hydraulic system. All three manifolds are the same.
The manifold has two pairs of inlet ports (2 are identified as A and 2 are identified as B) and three outlet ports (identified as C, D and E). Only one inlet port from each pair is used, the ports which are not used are sealed.
In the manifold there are three check valves and three 2/2-way valves. All of the valves are spring loaded poppet type valves. The 2/2-way valves are manually operated. They are only selected to open for ground maintenance tasks.
(2) Ultrasonic Flowmeter
The ultrasonic flowmeter (USF) is used to measure the internal leakage of the Green, Blue and Yellow hydraulic systems. The USF is only used on the ground.
The USF can be used in a temperature range from -30 [C (-22 [F) to 130 [C (266 [F). The transmitter and the leakage transducer are the main components of the USF.
The items that follow are installed in the front panel of the transmitter:
The items that follow are installed in the rear panel of the transmitter:
The leakage transducer has:
The ultrasonic flowmeter (USF) is used to measure the internal leakage of the Green, Blue and Yellow hydraulic systems. The USF is only used on the ground.
The USF can be used in a temperature range from -30 [C (-22 [F) to 130 [C (266 [F). The transmitter and the leakage transducer are the main components of the USF.
The items that follow are installed in the front panel of the transmitter:
- A keypad
- A display
- Three indication LED's
- A connection port for the leakage transducer.
The items that follow are installed in the rear panel of the transmitter:
- A connection socket for the power adapter or the battery charging unit
- A serial interface for the output of the measured data to a personal computer
- A battary compartment.
The leakage transducer has:
- two transducer measuring heads to measure the flow rate
- A temperature probe to measure the temperature of the hydraulic fluid
- A transducer cable to the transmitter
- A knurled screw for the attachment at a hydraulic pipe
- A fastening strap, a strap clamp and a threading element to safety the leakage transducer during the leakage measurement procedure.
B. Solenoid Valve
Each hydraulic system has a 3/2 way solenoid valve. It controls the supply of fluid to the leakage measurement manifold. The solenoid valves installed in the Green and Blue hydraulic systems are the same as one another. The solenoid valve installed in the Yellow hydraulic system is different from the other two.
The solenoid valves are attached to the high pressure (HP) manifold of their related system. Each solenoid valve controls the:
In addition, the solenoid valve of the Yellow hydraulic system has a restrictor. When the solenoid is energized, this restrictor allows a small ( 2.5 +-0.2 l.min or -+0.2 l.min (0.6604 +-0.0528 USgal.mn or -+0.0528 USgal.mn)) flow between the HP inlet and the LP outlet. This internal leakage is related to the automatic function of the solenoid valve on operation of the cargo doors. It makes sure that the flight control surfaces do not move during such operation.
Each hydraulic system has a 3/2 way solenoid valve. It controls the supply of hydraulic fluid to the related consumers. The solenoid valves installed in the Green and Blue hydraulic systems are the same type of valve. The solenoid valve installed in the Yellow hydraulic system is a different type of valve.
The solenoid valves are attached to the high pressure (HP) manifold of their related system. Each solenoid valve controls the:
Also, the solenoid valve of the Yellow hydraulic system has a restrictor. When the solenoid is energized, this restrictor allows a small ( 2.5 +0.2 -0.2 l.min (0.66 +0.05 -0.05 USgal.mn) ) flow of hydraulic fluid between the HP inlet and the LP outlet. This internal leakage is related to the automatic function of the solenoid valve on the operation of the cargo doors. It makes sure that the flight control surfaces do not move during the operation of the cargo doors.
Each hydraulic system has a 3/2 way solenoid valve. It controls the supply of fluid to the leakage measurement manifold. The solenoid valves installed in the Green and Blue hydraulic systems are the same as one another. The solenoid valve installed in the Yellow hydraulic system is different from the other two.
The solenoid valves are attached to the high pressure (HP) manifold of their related system. Each solenoid valve controls the:
- HP inlet (from system),
- HP outlet (to consumers),
- LP outlet (to return).
In addition, the solenoid valve of the Yellow hydraulic system has a restrictor. When the solenoid is energized, this restrictor allows a small ( 2.5 +-0.2 l.min or -+0.2 l.min (0.6604 +-0.0528 USgal.mn or -+0.0528 USgal.mn)) flow between the HP inlet and the LP outlet. This internal leakage is related to the automatic function of the solenoid valve on operation of the cargo doors. It makes sure that the flight control surfaces do not move during such operation.
Each hydraulic system has a 3/2 way solenoid valve. It controls the supply of hydraulic fluid to the related consumers. The solenoid valves installed in the Green and Blue hydraulic systems are the same type of valve. The solenoid valve installed in the Yellow hydraulic system is a different type of valve.
The solenoid valves are attached to the high pressure (HP) manifold of their related system. Each solenoid valve controls the:
- HP inlet (from system),
- HP outlet (to consumers),
- LP outlet (to return).
Also, the solenoid valve of the Yellow hydraulic system has a restrictor. When the solenoid is energized, this restrictor allows a small ( 2.5 +0.2 -0.2 l.min (0.66 +0.05 -0.05 USgal.mn) ) flow of hydraulic fluid between the HP inlet and the LP outlet. This internal leakage is related to the automatic function of the solenoid valve on the operation of the cargo doors. It makes sure that the flight control surfaces do not move during the operation of the cargo doors.
C. Pushbutton Switch (1882GP, 1883GP and 1884GP)
Three pushbutton switches, one for each system, are installed in the maintenance panel 50VU in the cockpit. They control the operation of the applicable solenoid valve.
Three pushbutton switches, one for each system, are installed in the maintenance panel 50VU in the cockpit. They control the operation of the applicable solenoid valve.
6. Operation
The operation of the ground internal leak test system in each system is the same.
The operation of the ground internal leak test system in each system is the same.
A. During Flight
During flight, the solenoid valve is open (de-energized) and the 2/2-way valves in the ground leakage-measurement manifold are closed. Inlet port A of the ground leakage-measurement manifold gets HP fluid through the solenoid valve. The fluid divides into three flows. Each flow goes through the applicable check valve to the outlet port of the applicable 2/2-way valve (closed). It then leaves the ground leakage-measurement manifold through the applicable outlet port (C, D or E) to supply the related systems.
Fluid also goes into the ground leakage-measurement through inlet port B. The fluid divides into three flows. Each flow goes to the inlet port of the applicable 2/2-way valve. The valve is closed and the flow of fluid stops.
During flight, the solenoid valve is open (de-energized) and the 2/2-way valves in the ground leakage-measurement manifold are closed. Inlet port A of the ground leakage-measurement manifold gets HP fluid through the solenoid valve. The fluid divides into three flows. Each flow goes through the applicable check valve to the outlet port of the applicable 2/2-way valve (closed). It then leaves the ground leakage-measurement manifold through the applicable outlet port (C, D or E) to supply the related systems.
Fluid also goes into the ground leakage-measurement through inlet port B. The fluid divides into three flows. Each flow goes to the inlet port of the applicable 2/2-way valve. The valve is closed and the flow of fluid stops.
B. During Ground Maintenance Tasks
During ground operation of the system, the applicable pushbutton switch on the maintenance panel (50VU) is set to close the related solenoid valve. This means that the HP inlet port is closed and the HP supply port is connected to LP return. No HP fluid goes to inlet port A of the ground leakage-measurement manifold.
A ground test rig and flow meter, connected to the applicable ground service panel supply HP fluid to the system. The HP fluid goes through the HP manifold to inlet port B of the ground leakage-measurement manifold. The HP fluid divides into three flows and goes to the inlet ports of the three 2/2-way valves. It then goes through the valve which has been opened to supply the applicable part of the aircraft.
During ground operation of the system, the applicable pushbutton switch on the maintenance panel (50VU) is set to:
During ground operation of the system, the applicable pushbutton switch on the maintenance panel (50VU) is set to close the related solenoid valve. This means that the HP inlet port is closed and the HP supply port is connected to LP return. No HP fluid goes to inlet port A of the ground leakage-measurement manifold.
A ground test rig and flow meter, connected to the applicable ground service panel supply HP fluid to the system. The HP fluid goes through the HP manifold to inlet port B of the ground leakage-measurement manifold. The HP fluid divides into three flows and goes to the inlet ports of the three 2/2-way valves. It then goes through the valve which has been opened to supply the applicable part of the aircraft.
During ground operation of the system, the applicable pushbutton switch on the maintenance panel (50VU) is set to:
- Open the related solenoid valve. The HP inlet port is opened and the HP supply port is connected to the HP supply from solenoid valve. HP hydraulic fluid goes to the flight controls in the rear section, the left wing and the right wing of the aircraft.
- Close the related solenoid valve. The HP inlet port is closed and the HP supply port is connected to the LP return. No HP hydraulic fluid goes to the flight controls in the rear section, the left wing and the right wing of the aircraft.