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with 3A, 3B, 2B and 1B in priority.
In flight with the APU as the single source of electrical power, two pumps only (3A
and 3B) are allowed to run to prevent overloading of the generator.
RESERVOIR QUANTITY LIMITS
The table on the following page describes the range of values between the upper and
lower fluid quantity limits for each system. The green brackets are variable in size, and
in combination with the reservoir filling and digital readout represent the level of
quantity in the reservoir for all airplane configurations.
The quantity indication (reservoir filling and digital readout) for systems 1 and 2 will
turn amber if the displayed reservoir quantity for that system is at or below the lower
limit.
GX_12_025
Legend
Electrical Flow
Generator
ACMP
AC BUS Electrical AC BUS
ACMP Priority 3A, 3B, 2B, 1B
PUMP
GEN
AC BUS 1 AC BUS 2 AC BUS 3 AC BUS 4
LEFT ENGINE RIGHT ENGINE
ACMP
3B
ACMP
2B
ACMP
1B
ACMP
3A
GEN
2
GEN
3
GEN
4
GEN
1
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-26 For Training Purposes Only
Sept 04
The quantity indication for system 3 will turn amber when the displayed quantity is at
or below the lower limit or at or above the upper limit when the quantity reaches 70%.
Not withstanding the limits stated above, the following table lists the normal quantity
you should see on your walkaround or on a synoptic page.
GX_12_026
SYSTEM No. 1 SYSTEM No. 3 SYSTEM No. 2
LOWER
LIMIT
UPPER
LIMIT
Hydraulic Quantity
Lower Limit = 34%
Hydraulic Quantity
Lower Limit = 20%
Hydraulic Quantity
Lower Limit = 32%
Hydraulic Quantity
Upper Limit = 70%
100% 100%
Hydraulic Quantity
Lower Limit (L & R gear
uplocked) = 28%
IN FLIGHT:
IN FLIGHT:
IN FLIGHT: IN FLIGHT:
Hydraulic Quantity
Lower Limit = 16%
Hydraulic Quantity
Lower Limit = 12%
Hydraulic Quantity
Upper Limit = 100%
ON GROUND: ON GROUND:
ON GROUND:
ON GROUND:
22 °C
61%
38 °C
63%
20 °C
62%
For Training Purposes Only
Sept 04
12-27
P I LOT T R A I N I N G GU I D E
HYDRAULICS
Hydraulic System No. 1
(Sys on, spoilers down, TRs stow)
Max qty drop – pressurized = 4%
FLUID TEMP (°C) RESERVOIR LEVEL (%)
-16 to 4 38 to 47
5 to 26 47 to 56
27 to 49 56 to 66
50 to 71 66 to 74
72 to 93 74 to 83
Hydraulic System No. 2 – Quantity Check
(Sys on, spoilers down, TRs stow, brakes off)
Max qty drop – pressurized = 12%
FLUID TEMP (°C) RESERVOIR LEVEL (%)
-16 to 4 40 to 50
5 to 26 51 to 58
27 to 49 58 to 65
50 to 71 66 to 73
72 to 93 74 to 80
Hydraulic System No. 3 – Quantity Check
(Sys on, spoilers down, LDG doors closed,
brakes off)
Max qty drop – pressurized = 18%
FLUID TEMP (°C) RESERVOIR LEVEL (%)
-16 to 4 30 to 36
5 to 26 37 to 43
27 to 49 44 to 50
50 to 71 51 to 58
72 to 93 58 to 65
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-28 For Training Purposes Only
Sept 04
EICAS MESSAGES
789
1 . 65
HYD 1 LO PRESS
HYD 2 LO PRESS
HYD 3 LO PRESS
HYD 1 HI TEMP
HYD 2 HI TEMP
HYD 3 HI TEMP
HYD RAT PUMP FAIL
HYD 1 LO QTY
HYD 3 OVERFILLED
L HYD SOV FAIL
R HYD SOV FAIL
HYD 2 LO QTY
HYD 3 LO QTY
GX_12_027
HYD 3 OVERFILLED
Indicates that system 3
quantity is more than
70% with the system
pressurized on the
ground.
HYD 1 (2) (3) LO QTY
Indicates that the corresponding
system is at the
lower quantity limit.
HYD 1 (2) (3) HI TEMP
Indicates that the
corresponding system
fluid temperature is
> 96°C.
HYD RAT PUMP FAIL
Indicates that the RAT
pump has a low output
pressure (<1800 psi).
HYD 1 (2) (3)
LO PRESS
Indicates that the corresponding
system pumps
(both) in each system
have a low-pressure
output (<1800 psi).
L (R) HYD SOV FAIL
Indicates that the left
and/or right hydraulic
shutoff did not go to its
commanded position
(open or closed) following
the pull of a fire handle.
For Training Purposes Only
Sept 04
12-29
P I LOT T R A I N I N G GU I D E
HYDRAULICS
EICAS MESSAGES (Cont)
789
1 . 65
HYD EDP 1A FAIL
HYD EDP 2A FAIL
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