• Three independent Hydraulic systems (Green, Blue, Yellow)
• In normal operation Green and Yellow system provided by engine driven pumps (Green = L/H engine, Yellow = R/H engine) and Blue by Electric pump
• Each system got its own reservoir which is pneumatically pressured by engine # 1 HP air or X bleed duct
• All reservoirs will be filled by Green ground service panel
• Accumulators in the system helps to maintain constant pressure during normal operation by covering transit demands
Green System
• EDP driven by L/H engine, provide pressure 3000 psi and pump cooling and lubricating flow passes through a filter and goes to return line
• Can be pressurized via PTU by Yellow system with out fluid transfer
• Fire SOV located in up stream of the pump to isolates system if required by engine fire P/B
• Reservoir low level and low quantity indication on ECAM by a transmitter and a low level switch
• Reservoir air used to prevent pumps cavitation, low air pressure measured by pressure switch (pressure < 22 psi)
• Pressure Sw. monitors EDP output pressure for ECAM indication (threshold pressure = 1740 psi) HP manifold
• Qty 2 pressure Sw. sends signal to FAC 1, BSCU, ECAM, SEC 1, ELAC 1& 2 other Sw. sends to ELAC 1
& 2, SEC 2 & 3 (threshold pressure = 1450 psi)
• HP filter equipped with clogging indicat or measures ∆P > 87 psi
• Pressure transducer sends system pressure to ECAM & ELAC 1 & 2
• Leak measurement solenoid valve located on HP manifold isolates flight controls when P/B on maintenance panel set to OFF
• Accumulator damps at small pressure changes filled with Nitrogen pressure 1885 psi
• Leak measurement manifold, operation of spool valve allows associated section to be supplied for leak measurement test
PTU manifold
• Normal braking selector valve which cuts off hydraulic power to the normal braking selector valve
• Priority valve
• PTU isolating solenoid valve which deactivates PTU with several conditions
• Return manifold consists of
• Temp. sensor + temp. transducer sends data for ECAM warnings
• Filter and clog indicator Yellow System
• EDP driven by R/H engine, provides pressure 3000 psi and pump cooling and lubricating flow passes through a filter and goes to return line
• Can be pressurized via PTU by Green system with out fluid transfer
• Electrical pump use to provide auxiliary power
• Hand pump can be used to open/close cargo door if electrical pump not available, located in Gnd. service panel
• Fire SOV located in up stream of the pump to isolate system if required by engine P/B
• Reservoir low level and low quantity indication on ECAM by a transmitter and a low level switch
• Reservoir air used to prevent pump cavitation, low air pressure measured by pressure switch and sends to ECAM (pressure < 22 psi)
• Pressure Sw. monitors EDP output pressure for ECAM indication (threshold pressure = 1740 psi)
• Yellow electrical pump runs with Electrical pump P/B press or cargo door operation HP manifold
• Qty 2 pressure Sw. sends signal to SEC 1, ELAC 1& 2 other Sw. sends to ECAM, ELAC 1 & 2, SEC 2
& 3, FAC 2 (threshold pressure = 1450 psi)
• Pressure transducer send to ECAM & ELAC 1 & 2
• Leak measurement solenoid valve located on HP manifold automatically prevent flight control operation if electrical pump operated by cargo door Sw.
• HP filter equipped with clogging indicator measures ∆P > 87 psi
• Accumulator damped at small pressure changes filled with Nitrogen pressure 1885 psi
• Leak measurement manifold spool valve allows associated section of flight controls to be supplied for leak measurement test
PTU manifold
• Priority valve
• Quick disconnect for maintenance operation to prevent PTU operation
• Solenoid valve stops PTU operation with Sw. command on the hydraulic panel
• Return manifold consists of
• Temp. sensor + temp. transducer sends data for ECAM warnings
• Filter and clog indicator Blue system
• Electrical pump will be pressurize the system for 3000 psi
• RAT provides hydraulic pressure 2500 psi in emergency use, automatic deployment inhibited on Gnd., located in Blue hydraulic compartment
• Reservoir low level and low quantity indication on ECAM by a transmitter and a low level Sw.
• Reservoir air used to prevent pump cavitation, low air pressure measured by two pressure switches and sends to ECAM (pressure < 22 psi meg “LO AIR PRES” ) and press < 30 psi with message “BLUE RSVR”
• Pressure Sw. monitors Elect pump output pressure (threshold pressure = 1450 psi) HP manifold
• Qty 2 pressure Sw. sends signal to ECAM, SEC 1, ELAC 1& 2 other Sw. sends to ELAC 1 & 2, SEC 2
& 3 (threshold pressure = 1450 psi)
• Pressure transducer send to ECAM & ELAC 1 & 2
• Leak measurement valve isolates flight controls
• Priority valve
• HP filter equipped with clogging indicator measures ∆P > 87 psi
• Accumulator damped at small pressure changes filled with nitrogen pressure 1885 psi
• RAM air turbine can be manually operate or automatically in flight
• Leak measurement manifold spool valve allows associated section of flight controls to be supplied for leak measurement test
• Return manifold consists of
• Temp. sensor + temp. transducer sends data for ECAM warnings
• Filter and clog indicator
PTU • Automatically activated when differential pressure between green and yellow system > 500 psi
• When engines shut down PTU allows Green system to be pressurized by Yellow electric pump
• PTU automatically Inhibited
• During 1st engine start (to eliminate noise) and automatically tested when 2nd engine start on Gnd. with parking brakes ON or Towing arm attached (Green hydraulic not required for normal braking or steering)
• During cargo door operation with yellow electrical pump
• Two solenoids located in Green and Yellow PTU manifolds will cut off PTU up on inhibited conditions and PTU P/B press on hydraulic panel
PTU
Sw. AUTO – Arming of PTU auto mode
A FAULT – Reservoir low air pressure, low fluid level or OVHT U - PTU fault
T Sw. OFF – Solenoid in Green & Yellow HP manifolds close PTU operation O
Engine Pump
ENG. PUMP Push IN – Pump pressurize Green (Yellow) system
Sw. OFF – Pump in de pressurized mode
Fault – Reservoir low air pressure, low fluid level or OVHT
- Pump low pressure (inhibits on Gnd. when engine stopped) - Lt. goes off when Sw. select off except OVHT condition) FAULT
OFF FAULT
OFF
HYD RAT MAN ON Sw.
HYD
RAT MAN ON Press IN – RAT deploy at any time (If automatic failure)
Electrical pump (Blue) ELEC PUMP
Sw in AUTO – Pump operates from 1st engine start up until last engine stop A Sw. OFF – Pump
U Fault – Reservoir low air pressure, low fluid level or OVHT T -Pump low pressure
O
• Can run for long time for Gnd. maintenance purposes with out OVHT hydraulic fluid
• Blue electrical pump operates if
• At touch down after nose landing gear compressed + 2min with AC power avail
• Elect P/B in auto + Nose L/G not compressed + AC power avail from APU
• One engine run + Elect P/B in auto
• Elect P/B in auto + Blue OVRD pump select ON Yellow electrical pump
ELEC PUMP
Press IN – Pump ON
Fault - Reservoir low air pressure, low fluid level or OVHT - Pump low pressure (PTU will not be available)
Maintenance Panel
Sw. Pressed IN – On Gnd. Blue electrical pump can be pressurized for maintenance purpose provided Electrical pump P/B on BLUE PUMP hydraulic panel set to AUTO
OVRD
Leak measurement valves
• Located in each HP manifold operated by guarded P/B in maintenance panel
• Valve closes during cargo door operation to prevent hydraulically power the flight control system HYD
LEAK MESU. VALVES
One for each hydraulic system of Primary flight control to leak measurement Sw press IN – Normal operation
OFF – Only on Gnd. valve closes and stops hydraulic supply to primary flight controls
FAULT
OFF
FAULT
OFF
ON
OFF
Leak measurement system
• Flight control systems permanently supplied through leak measurement valves
• During hydraulic test PTU connection to be removed to prevent PTU operation
• Spool valves in leak measurement manifold will facilitate select associate section to be tested during test and also can be manually close / open for maintenance purposes
Priority Valves
During low hydraulic pressure maintain operation of essential systems by cut off hydraulic for heavy uses.
Closes at pressure 1841 psi
• During Cargo door operation
• PTU inhibited by solenoid valves
• Yellow Leak measurement valves activate to prevent hydraulic pressure goes in to flight control systems
• Provide a signal to SFCC to prevent any Flap movement ECAM Indications
• LO AIR PRESS – If low air pressure in the hydraulic reservoir
• OVHT – Reservoir return hydraulic temp. above normal
• OVHT(at hydraulic pump) – Pump OVHT