HYD SYS 2 (3) PRESSURE TRANSMITTER, T407 (T406)
SYSTEM 2 AND SYSTEM 3 INSTALLATION
E
Hydraulic Systems - Component Location Figure 102 (Sheet 3)
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747-400 FAULT ISOLATION/MAINT MANUAL
SEE G SHT 5 CASE DRAIN MODULE (REF)
SEE I SHT 5 LOW PRESSURE RESERVOIR HYDRAULIC SYSTEM WARNING SWITCH S1576,S1577, S1578,S1579 FWD SEE H SHT 5 ENGINE NACELLE STRUT (TYP) PRESSURE FILTER MODULE (REF)
SEE F HYDRAULIC FLUID QUANTITY TRANSMITTER
HYDRAULIC RESERVOIR FWD(REF) HYD SYSTEM 1,2,3, OR 4 QUANTITY TRANSMITTER, T401, T402, T403, OR T404
HYDRAULIC FLUID QUANTITY TRANSMITTER
F
Hydraulic Systems - Component Location
Figure 102 (Sheet 4)
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747-400 FAULT ISOLATION/MAINT MANUAL
DEMAND PUMP 1,2,3,
OR 4 PRESSURE SWITCH,
S342, S343, S344, OR S345
ENGINE DRIVEN PUMP 1,2,3, OR 4 PRESSURE SWITCH, S5, S6, S7, OR S8
FWD
H PRESSURE FILTER MODULE (REF)
X385, X386, X387, OR X388 OVHT HYD SYS 1,2,3, OR 4 TRANSMITTER,
CASE DRAIN MODULE (REF) BONDING (VIEW LOOKING FORWARD) JUMPER (REF) G
HYDRAULIC SYSTEM RESERVOIR LOW PRESSUREWARNING SWITCH S1576,S1577,S1578,S1579
I
Hydraulic Systems - Component Location (Details from Sheet 4) Figure 102 (Sheet 5)
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747-400 FAULT ISOLATION/MAINT MANUAL
REMOTE HYDRAULIC
FLUID QUANTITY
INDICATOR, N119
L BODY LANDING GEAR WHEEL WELL
(GROUND SERVICING SYSTEM)
SEE J
FWD
HAND PUMP
(REF) VALVE SELECTOR
SEE K
GROUND SERVICING SYSTEM
J
FWD
REMOTE HYDRAULIC QUANTITY
INDICATOR SELECT SWITCH,
ELECTRICAL S561
CONNECTOR
SELECTOR VALVE
SELECTOR VALVE K
Hydraulic Systems - Component Location
Figure 102 (Sheet 6)
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747-400 MAINTENANCE MANUAL
HYDRAULIC PRESSURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
________________________________________________________________
General
_______
A. The hydraulic pressure indicating system gives a visual display of each of the four main hydraulic system pressures. Each system has a pressure transmitter that operates independently. The pressure of each system is shown on the EICAS display in the flight compartment.
Pressure Transmitter (Fig. 1)
____________________
A. The pressure transmitters for hydraulic systems No. 1 and No. 4 are installed in the right body gear wheel well in the upper inboard forward corner. System No. 2 transmitter is installed on the forward bulkhead of the left wing gear wheel well. System No. 3 transmitter is installed on the forward bulkhead of the right wing gear wheel well.
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