boeing 767 300 hydraulics
DESCRIPTION
B767TRANSCRIPT
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B767
Hydraulics
DONOTUSEFORFLIGHT
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Introduction The airplane has three independent hydraulic systems: left, right, and center. The hydraulic systems power the:
flight controls leading edge slats trailing edge flaps landing gear wheel brakes nose wheel steering autopilot servos thrust reversers tailskid
Flight control system components are distributed so that any one hydraulic system can provide adequate airplane controllability.Hydraulic fluid is supplied to each hydraulic pump from the associated system reservoir. The reservoirs are pressurized by the bleed air system.
Boeing B767 - Systems Summary [Hydraulics]
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Hydraulic Systems Schematic
QTYPRESS SYS
QTYPRESS SYS
OVHT
PRESS
OVHT
PRESS
LEFT
DISCH21
L REV
FLT CTRL
R REV
NORM BRKS
ENG
SOVSOV
ENGELEC
RAT
ISLNSOV
LC2
R
SLATS
HYD DRIVENGENERATOR
NOSE WHEELSTEERING LND GEAR
FLT CTRL
ISLN
PES
ELECC1
ISLN
FLT CTRL
ALTN BRAKESFLAPS
TAILSKID
PRIMARY FLOWDEMAND FLOW
ELECRAIR
CELECL
ISLN
PUMPISOLATIONVALVE
SHUTOFF CHECKVALVE
LEFTRESERVOIR
CENTERRESERVOIR
RIGHTRESERVOIR
VALVE
PUMPS
DNAMED
C
YRAMIRPENG
R
ELEC
ONOFFAUTOONOFF
AUTO
OVHT
PRESSON
OVHT
PRESSON
OVHT
PRESSON
OVHT
QTYPRESS SYS
YRAMIRP ENG
LHYD
1-ELEC-2
PRESSON
AIR
DNAMED
ELEC
ONOFFAUTO
OVHT
PRESS
RESERVEBKS & STRG
ON
VALVE
PRESS
UNLKD
RAM AIR TURB
Boeing B767 - Systems Summary [Hydraulics]
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LEFT
DISCH21
FLT CTRL
NORM BRKS
ENG
SOVSOV
ENGELEC
RAT
ISLNSOV
LC2
R
SLATS
HYD DRIVENGENERATOR
NOSE WHEELSTEERING LND GEAR
FLT CTRL
ISLN
PES
ELECC1
ISLN
FLT CTRL
ALTN BRAKESFLAPS
TAILSKID
PRIMARY FLOWDEMAND FLOW
ELECRAIR
CELECL
ISLN
PUMPISOLATIONVALVE
SHUTOFF CHECKVALVE
LEFTRESERVOIR
CENTERRESERVOIR
RIGHTRESERVOIR
VALVE
QTYPRESS SYS
QTYPRESS SYS
OVHT
PRESS
OVHT
PRESS
PUMPS
DNAMED
C
YRAMIRPENG
R
ELEC
ONOFFAUTOONOFF
AUTO
OVHT
PRESSON
OVHT
PRESSON
OVHT
PRESSON
OVHT
QTYPRESS SYS
YRAMIRP ENG
LHYD
1-ELEC-2
PRESSON
AIR
DNAMED
ELEC
ONOFFAUTO
OVHT
PRESS
RESERVEBKS & STRG
ON
VALVE
PRESS
UNLKD
RAM AIR TURB
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Left Hydraulic System The left hydraulic system powers:
flight controls left engine thrust reverser
The system consists of a reservoir, enginedriven primary pump, and an electric motordriven demand pump.
Fluid SupplyHydraulic fluid is supplied to each hydraulic pump from a reservoir. The reservoir is pressurized by the bleed air system. A quantity measuring system provides information to the EICAS status display. RF displays on the EICAS status page when a reservoir requires refilling prior to dispatch. The QTY light illuminates and the EICAS advisory message L HYD QTY displays when the reservoir quantity is low.Fluid for the enginedriven pump flows through a shutoff valve controlled by the engine fire switch. Pulling the fire switch shuts off the flow of fluid to the engine pump and depressurizes the pump.
Enginedriven Primary PumpThe primary hydraulic system pump is an enginedriven pump. The primary pump PRESS light illuminates and the EICAS advisory message L HYD PRIM PUMP displays when the pump output pressure is low. The pump OVHT light illuminates and the EICAS advisory message L PRIM HYD OVHT displays when the pump temperature is high.
Electric Motordriven Demand PumpAn electric motordriven demand pump provides additional hydraulic power either on demand or continuously for periods of high system demand. The demand pump also provides a backup hydraulic power source for the enginedriven primary pump.The pump PRESS light illuminates and the EICAS advisory message L HYD DEM PUMP displays when the pump output pressure is low. The pump OVHT light illuminates and the EICAS advisory message L DEM HYD OVHT displays when the pump temperature is high.To reduce electrical load, the left electric demand pump is inhibited on the ground during engine start of either engine, when only one electrical generator is operating. The left demand pump PRESS and SYS PRESS lights may illuminate when starting engines on the ground.
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System Pressure IndicationsThe SYS PRESS light illuminates and the EICAS caution message L HYD SYS PRESS displays when the hydraulic system pressure is low.
Right Hydraulic SystemThe right hydraulic system is similar to the left system. The right system powers:
flight controls normal brakes pitch enhancement system right engine thrust reverser
The system consists of a reservoir, enginedriven primary pump, and an electric motordriven demand pump.
Fluid SupplyThe right reservoir is similar to the left system. The associated EICAS message for low reservoir quantity is R HYD QTY.
Enginedriven Primary PumpThe right enginedriven primary pump is identical to the left system. The associated EICAS messages for low pump output pressure or high pump temperature are R HYD PRIM PUMP and R PRIM HYD OVHT.
Electric Motordriven Demand PumpThe right electric motordriven demand pump is identical to the left system. The associated EICAS messages for low pump output pressure or high pump temperature are R HYD DEM PUMP and R DEM HYD OVHT.
System Pressure IndicationsThe right system pressure indications are similar to the left system. The associated message for low system pressure is R HYD SYS PRESS.
Center Hydraulic SystemThe center system powers:
flight controls nose wheel steering flaps and slats alternate brakes landing gear hydraulic driven generator tailskid
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The system consists of a reservoir, two electric motordriven pumps, an airdriven demand pump, and a ram air turbine (RAT) pump.
Fluid SupplyThe center reservoir is similar to the left system. The associated EICAS messages for low reservoir quantity is C HYD QTY.The reservoir maintains reserve hydraulic fluid for use by the brakes and steering in the event of a center system hydraulic leak.
Electric Motordriven Primary PumpsThe two center electric motordriven primary pumps are identical to the left and right system electric motor-driven pumps. The C2 pump may be load shed automatically to reduce electrical loads. The associated EICAS messages for low pump output pressure or high pump temperature are C HYD PRIM 1, C HYD PRIM 2, C HYD 1 OVHT, and C HYD 2 OVHT.
Airdriven Demand PumpAn airdriven demand pump provides additional hydraulic power either on demand or continuously for periods of high system demand. The demand pump also provides a backup hydraulic power source for the electric motordriven primary pumps.The pump PRESS light illuminates and the EICAS advisory message C HYD DEM PUMP displays when the pump output pressure is low. The pump OVHT light illuminates and the EICAS advisory message C DEM HYD OVHT displays when the pump temperature is high.
System Pressure IndicationsThe center system pressure indications are similar to the left system. The associated message for low system pressure is C HYD SYS PRESS.
Reserve Brakes and Steering IsolationThe center number one electric primary hydraulic pump is automatically isolated, if system quantity is sensed low, to provide hydraulic pressure to the reserve brakes and steering system.
Hydraulic Driven GeneratorA hydraulic driven generator is automatically powered by the center hydraulic system when electrical power is lost from both main AC busses. The center air demand pump will then operate continuously to ensure sufficient hydraulic pressure to drive the generator.
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Ram Air Turbine (RAT) PumpWhen deployed, the RAT, provides hydraulic power to the flight controls portion of the center hydraulic system. The RAT provides adequate hydraulic power at speeds above 130 knots. In flight, the RAT deploys automatically when both engines fail. The RAT is inhibited from auto deployment on the ground.The RAT can be deployed manually by pushing the RAM AIR TURB switch. The UNLKD light illuminates and the EICAS advisory message RAT UNLOCKED displays when the RAT is not stowed and locked. Once the RAT is producing pressure the ram air turbine PRESS light illuminates. The SYS PRESS light remains illuminated if the RAT is the only source of center system pressure. Once deployed, the RAT cannot be stowed in flight.
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Hydraulics EICAS Messages The following EICAS messages can be displayed.
Message Level Light Aural Condition
C DEM HYD OVHT
L DEM HYD OVHT
R DEM HYD OVHT
C HYD 1 OVHT
C HYD 2 OVHT
L PRIM HYD OVHT
R PRIM HYD OVHT
Advisory OVHT Pump temperature is high.
C HYD DEM PUMP
L HYD DEM PUMP
R HYD DEM PUMP
L HYD PRIM PUMP
R HYD PRIM PUMP
C HYD PRIM 1
C HYD PRIM 2
Advisory PRESS Pump output pressure is low.
C HYD QTY
L HYD QTY
R HYD QTY
Advisory QTY Hydraulic quantity is low.
C HYD SYS PRESS
L HYD SYS PRESS
R HYD SYS PRESS
Caution SYS PRESS
Beeper Hydraulic system pressure is low.
RAT UNLOCKED Advisory UNLKD The ram air turbine is not stowed and locked.
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Hydraulic Panel
1 System Pressure (SYS PRESS) Lights Illuminated (amber) system pressure is low.
2 Reservoir Low Quantity (QTY) LightsIlluminated (amber) reservoir quantity is low.
3 Left/Right Engine (L/R ENG) Primary Pump Switches ON the enginedriven hydraulic pump pressurizes when engine rotates.Off (ON not visible) the enginedriven hydraulic pump is turned off and depressurized.
4 Pump Pressure (PRESS) Lights Illuminated (amber) pump output pressure is low.
PRESS
OVHT
PRESS
OVHT
QTY
SYSPRESS
AUTO
OVERHEAD PANEL
HYD PUMPS
ENGR
- -2ELEC1C
ENGL
OVHT
ON
PRESS
ON
PRESS
ON
PRESS
ON
PRESS
OVHTOVHTOVHT
QTYQTY
SYSPRESS
PRESS
OVHT
DNAMED
YRAMIRP
DNAMED
YRAMIRP
ON ON ONAUTO AUTOOFF OFF OFF
ELECAIRELEC
1
2
3
4
5
6
SYSPRESS
7
5 Pump Overheat (OVHT) Lights Illuminated (amber) pump temperature is high.
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6 Center 1/2 Electric (C1/2 ELEC) Primary Pump Switches ON the electric motordriven pump pressurizes the center hydraulic system.OFF (ON not visible) the electric motordriven hydraulic pump is turned off.
7 Left/Right Electric and Center Air (L/R ELEC and C AIR) Demand Pump Selectors
ON continuous operation.AUTO
left/right electric pumps operate when engine pump pressure is low center air demand pump operates when both center electric pump
pressures are low center air demand pump operates when heavy load items are selected
OFF pump off.
Status Display
1 Hydraulic Fluid Quantities (HYD QTY) displays system reservoir quantity (1.00 is the normal service level) RF (magenta) displayed when the reservoir requires refilling
Miscellaneous Hydraulic System ControlsReserve Brakes and Steering Reset/Disable Switch
EICAS STATUS DISPLAY
1.00.75RF 1.00HYD QTYC RL
1
ISLN
C HYD SYSRESERVE BRAKES & STRG
RESET/DISABLE
NORM
ACCESSORY PANEL
1
2
1 Reset/Disable SwitchRESET/DISABLE resets or disables the automatic isolation feature of the center hydraulic system.NORM the isolation feature is armed for automatic operation.
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2 Isolation (ISLN) LightIlluminated (white) the center number one electric primary hydraulic pump is isolated to provide hydraulic pressure to the reserve brakes and steering system.
Ram Air Turbine
1 RAM AIR Turbine (TURB) Switch Push deploys the RAT.
2 Ram Air Turbine Pressure (PRESS) Light Illuminated (green)
the RAT is deployed the RAT is producing hydraulic pressure
3 Ram Air Turbine Unlocked (UNLKD) Light Illuminated (amber) the RAT is not stowed and locked.
RAM AIR TURB
UNLKD
PRESS
OVERHEAD PANEL
1
2
3
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