13-Hydraulics

13-Hydraulics

Hydraulics 13 Hydraulics (tab) 13-Hydraulics Table Of Contents
747 Flight Crew Operations Manual
Chapter 13 Hydraulics Table of Contents Section TOC Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10 Hydraulic Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.1 Hydraulic System Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.3 Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.3 Hydraulic Synoptic Display . . . . . . . . . . . . . . . . . . . . . . . . . . 13.10.4
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Hydraulic Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Engine Driven Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Demand Pumps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Auxiliary Pump(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Fluid Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.1 Load Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.2 Hydraulic Systems 1, 2, and 3 Diagram. . . . . . . . . . . . . . . . . . . . 13.20.5 Hydraulic System 4 Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.6
EICAS Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.30 EICAS Alert Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.30.1
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Intentionally
Blank
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Hydraulics Controls and Indicators File HighlightHydraulic Panel
10 Controls and Indicators Controls and Indicators
Chapter 13 Section 10
SYS FAULT
PRESS
AUTO
OFF
1
ON
PRESS
ON
OFF
SYS FAULT
PRESS
AUTO
2
ON
HYD
PUMPS
ON
OFF
SYS FAULT
PRESS
AUTO
ON
OFF
DEMAND
AUX
3
ON
PRESS
ENGINE
PRESS
OVERHEAD PANEL
SYS FAULT
PRESS
AUTO
ON
4
ON
PRESS
3
4
5
1
2
1 Hydraulic DEMAND Pump Selector
OFF – demand and auxiliary pumps off. AUTO –
• demand pump operates when respective engine pump output pressure is
low, or when respective fuel control switch is in CUTOFF
• demand pumps 1 and 4 also operate when trailing edge flaps are in
transit, or in flight when flaps extended past 1
ON – demand pump operates AUX (System 4) –
• auxiliary pump operates on ground until respective engine driven pump
pressurizes respective demand pump off

2 ENGINE Hydraulic Pump Switch
ON – engine hydraulic pump pressurizes system when engine rotates.
3 Hydraulic System (SYS) Fault Light
Illuminated (amber) –
low hydraulic system pressure low hydraulic reservoir quantity
• • • excessive hydraulic fluid temperature
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Hydraulics – Controls and Indicators
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4 Demand Pump Low PRESS Light
Illuminated (amber) –
• •
demand pump selector positioned to OFF or AUX demand pump commanded to operate and output pressure is low
5 ENGINE Hydraulic Pump Low PRESS Light
Illuminated (amber) – low engine hydraulic pump pressure.
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Hydraulics – Controls and Indicators
Hydraulic System Indications To view the status display, push the STAT display switch on the display select panel. To view the hydraulic synoptic, push the HYD synoptic display switch on the display select panel. Display select panel operation is described in Chapter 10, Flight Instruments, Displays. Status Display
1
2
3
HYD QTY HYD PR HYD TEMP
1 2 075 100 3000 3000 50
3 095 950 50 50
RF
4
5
LO
4 034 3000 108
SECONDARY EICAS DISPLAY
1 Hydraulic Fluid Quantity (HYD QTY)
Hydraulic reservoir quantity of each system displays as a percentage of the normal service level (1.00).
2 Hydraulic System Pressure (HYD PR)
Hydraulic pressure of each system displays in psi.
3 Hydraulic System Temperature (HYD TEMP)
Hydraulic fluid temperature of each system displays in degrees C.
4 Reservoir Refill
RF (Refill) (magenta) – displays on ground when reservoir requires refill.
5 Low Reservoir Quantity
LO (magenta) – displays when a reservoir quantity is low.
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Hydraulic Synoptic Display The hydraulic power flow displayed is generated by the displayed valve positions, pump status, and fluid levels. It does not display actual hydraulic power flow, therefore the display may not represent actual system operation. EC-KXN – EC-MRM
1 2
3
EDP
AUTO
DEM
SOV
EDP
OFF
EDP
OFF
EDP
OFF
DEM
SOV
OFF
DEM
OFF
DEM
AUX
SOV
SOV
RF
0.70 2950 50
1
0.99 2975 50
2
QTY PRESS TEMP
LO
0.10 0 10
3
1.00 2950 50
4
RSVR PRESS
4
5
6
HYDRAULIC POWER FLOW NO POWER FLOW
SECONDARY EICAS DISPLAY
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Hydraulics – Controls and Indicators
EC-KSM
7
4
5
6
ELEV FEEL STAB TRIM
AUTOPILOT R
SPLR 2,3,10,11 YAW DAMPER LWR
THRUST REV
AUTOPILOT L
SPLR 1,4,9,12 YAW DAMPER UPR
THRUST REV
1
2
3
EDP
EDP
OFF
EDP
OFF
EDP
OFF
AUTO
DEM
OFF
DEM
OFF
DEM
OFF
DEM
AUX
SOV
SOV
SOV
SOV
RF
0.70 2950 50
1
0.99 2975 50
2
QTY PRESS TEMP
LO
0.10 0 10
3
1.00 2950 50
4
RSVR PRESS
HYDRAULIC POWER FLOW NO POWER FLOW
SECONDARY EICAS DISPLAY
1 Engine Driven Pump
OFF – engine driven pump is not operating.
2
Demand Pump
OFF – demand pump is not operating.
3 Hydraulic Reservoir
Fluid Level – displays relative fluid level in the hydraulic reservoir.
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4 Auxiliary Pump
OFF – auxiliary pump is not operating.
5
Shutoff Valve
Indicates open or closed position of shutoff valve.
6 Reservoir Pressure
RSVR PRESS – displays when reservoir bleed air pressure is low. EC-KSM
7
Inoperative Systems
Lists inoperative systems due to hydraulic system failures.
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Hydraulics System Description File HighlightIntroduction The airplane has four independent hydraulic systems, numbered by the engine which powers it. The hydraulic systems power the:
Chapter 13 Section 20
20 System Description System Description
• primary flight controls • autopilot servos • spoilers • stabilizer trim • elevator feel
landing gear • • flaps • brakes • steering EC-KSM, EC-KXN, EC-MQK, EC-MRM •
thrust reversers
Hydraulic Systems Each system is powered by an engine driven pump and a demand pump installed in parallel. Engine Driven Pumps Each system has an engine driven pump (EDP). The EDP is pressurized when the engine is running and the engine pump switch is ON. Demand Pumps The demand pumps supply normal system demands if an engine or EDP fails. Systems 1 and 4 have air driven demand pumps. The bleed air manifold provides pneumatic power for the air driven pumps. Systems 2 and 3 have electric motor driven demand pumps. In the AUTO position, the demand pumps operate during periods of high system demands, such as flaps in transit or gear retraction. Auxiliary Pump(s) System 4 has an electric auxiliary pump for ground handling operations. Fluid Supply Independent reservoirs supply fluid to each hydraulic system. The bleed air system pressurizes the reservoirs to prevent pump cavitation and ensure positive flow during high demand conditions. RSVR PRESS displays next to the synoptic reservoir symbol when reservoir bleed air pressure is low.
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13.20.1
Hydraulics – System Description
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Fluid pressure, fluid temperature and reservoir quantity are displayed on the EICAS status display and hydraulic synoptic display. The letters RF display next to the reservoir quantity indication when refill is required. RF is inhibited in flight and replaced with the letters LO when a system low quantity exists. Hydraulic quantity levels fluctuate with variations in temperature as well as with the activation of systems using hydraulic power. Each hydraulic system has a dedicated hydraulic interface module (HYDIM) to process temperature and pressure inputs as well as perform some pump control. Should a HYDIM fail, the following indications may occur on that hydraulic system:
• blank hydraulic pressure and temperature indications on the EICAS
status and HYD synoptic pages
• HYD CONTROL X advisory messages
A single hydraulic quantity interface module (HYQUIM) processes quantity inputs from each reservoir transmitter. Should the HYQUIM fail the following false indications may occur for all four hydraulic systems:
• hydraulic SYS FAULT lights flashing on and off • >HYD QTY LOW X advisory messages appearing and disappearing • EICAS hydraulic quantity indications decreasing and increasing
EC-KSM For a single hydraulic system failure, the inoperative items display on the hydraulics synoptic above the affected system graphic. If multiple hydraulic systems are inoperative, additional items common to those systems display above the single system items and are connected by lines to the failed systems. A hydraulic fluid shutoff valve is installed in the fluid supply line to each EDP. If an engine fire switch is pulled, the respective hydraulic fluid shutoff valve closes, the EDP depressurizes, and the respective demand pump operates. Load Assignments Systems 1, 2, and 3 power the respective center, right, and left autopilot servos. Systems 2, 3, and 4 power spoilers. Systems 1 and 4 power trailing edge flaps and landing gear; and provide redundant power to primary flight controls. Systems 1 and 2 power alternate brakes. System 1 powers steering. System 4 powers normal brakes. EC-KSM, EC-KXN, EC-MQK, EC-MRM Systems 1, 2, 3, and 4 power respective thrust reversers.
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Hydraulics – System Description
EC-MDS
SYSTEM
1
SYSTEM
2
SYSTEM
3
SYSTEM
4
EDP
DEMAND
EDP
DEMAND EDP
DEMAND
EDP
AUX
DEMAND
CENTER
AUTOPILOT
LEFT
OUTBOARD AILERON
RIGHT
AUTOPILOT
LEFT INBOARD AILERON
LEFT
AUTOPILOT
RIGHT INBOARD AILERON
RIGHT
OUTBOARD AILERON
SPOILERS
2, 3, 10, 11
LOWER
YAW DAMPER
UPPER RUDDER
BODY
STEERING ACTUATION
ALTERNATE
BRAKES
INBOARD TRAILING EDGE FLAP
NOSE
STEERING ACTUATION
ELEVATOR
FEEL STAB TRIM
SPOILERS
1, 4, 9, 12
UPPER
YAW DAMPER
LOWER RUDDER
SPOILERS 5, 6, 7, 8
OUTBOARD TRAILING EDGE FLAP
WING GEAR
ACTUATION NORMAL BRAKES
LEFT
OUTBOARD ELEVATOR
LEFT
INBOARD ELEVATOR
RIGHT INBOARD ELEVATOR
RIGHT
OUTBOARD ELEVATOR
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EC-KSM, EC-KXN, EC-MQK, EC-MRM
SYSTEM
1
SYSTEM
2
SYSTEM
3
SYSTEM
4
EDP
DEMAND
EDP
DEMAND EDP
DEMAND
EDP
AUX
DEMAND
THRUST REVERSER CENTER
AUTOPILOT
LEFT
OUTBOARD AILERON
THRUST REVERSER RIGHT
AUTOPILOT
LEFT INBOARD AILERON
SPOILERS
2, 3, 10, 11
LOWER
YAW DAMPER
UPPER RUDDER
BODY
STEERING ACTUATION
ALTERNATE
BRAKES
INBOARD TRAILING EDGE FLAP
NOSE
STEERING ACTUATION
ELEVATOR
FEEL STAB TRIM
THRUST REVERSER
LEFT
AUTOPILOT
THRUST REVERSER
RIGHT INBOARD AILERON
RIGHT
OUTBOARD AILERON
SPOILERS
1, 4, 9, 12
SPOILERS 5, 6, 7, 8
UPPER
YAW DAMPER
LOWER RUDDER
OUTBOARD TRAILING EDGE FLAP
WING GEAR
ACTUATION NORMAL BRAKES
LEFT
OUTBOARD ELEVATOR
LEFT
INBOARD ELEVATOR
RIGHT INBOARD ELEVATOR
RIGHT
OUTBOARD ELEVATOR
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Hydraulic Systems 1, 2, and 3 Diagram
Hydraulics – System Description
FROM SYSTEM
T
OFF
ON
SYS FAULT
PRESS
AUTO
1
ON
PRESS
D E M A N D
E N G I N E
BLEED AIR
Q
FROM USING COMPONENTS
RUN
CUTOFF
FLAPS
1
P
2
P
TO USING COMPONENTS
DISCH
A
B
1
P
1
2
HYDRAULIC SYSTEM 1 ONLY SYSTEMS 2 & 3 USE ELECTRIC MOTOR DRIVEN DEMAND PUMPS
Shutoff Valve
Air Driven
Pump
Check Valve
Pressure Sensor
Temperature
Quantity
P
T
Q
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Hydraulic System 4 Diagram
FROM SYSTEM
T
ON
SYS FAULT
PRESS
AUTO
4
ON
PRESS
OFF
AUX
D E M A N D & A U X
E N G I N E
BLEED AIR
Q
RUN
CUTOFF
FROM USING COMPONENTS
FLAPS
P
P
TO USING COMPONENTS
M
AC
DISCH
A
B
4
P
Shutoff Valve
M
Electric Pump
P
T
Q
Air Driven
Pump
Check Valve
Pressure Sensor
Temperature
Quantity
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Chapter 13 Section 30
Hydraulics EICAS Messages File HighlightEICAS Alert Messages Level
Message
30 EICAS Messages EICAS Messages
HYD CONTROL 1, 4
Advisory
HYD OVHT SYS 1, 2, 3, 4 HYD PRESS DEM 1, 2, 3, 4
Advisory
Advisory
HYD PRESS ENG 1, 2, 3, 4
Advisory
Aural
Message Logic
Hydraulic control system is inoperative. Hydraulic system indications may be inoperative. Excessive hydraulic system temperature. Demand pump pressure is low. Occurs when Demand Pump selector OFF, demand pump commanded to run and demand pump output pressure low, or system 4 Demand Pump selector is in AUX. Inhibited by HYD PRESS SYS message in a system low pressure condition. Engine pump output pressure low. Inhibited by HYD PRESS SYS message in a system low pressure condition.
Beeper Loss of hydraulic system pressure.
Caution
HYD PRESS SYS 1, 2, 3, 4 EC-KSM, EC-KXN (EC-MDS ; before SB, IDS 508 software is not installed) >HYD QTY LOW 1, 2, 3, 4
Advisory
Hydraulic quantity low.
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13.30.1

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