(2)
Access Panel
451BL Forward Fairing - Strut 1
462EL Forward Fairing - Strut 2
472EL Forward Fairing - Strut 3
481BL Forward Fairing - Strut 4
C.
Prepare to Remove the Isolation Valve
S 864-002-N00
(1)
Attach the DO-NOT-OPERATE tags to the thrust levers.
S 864-003-N00
(2)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6F12 T/R IND ENG 1
2) 6E12 T/R IND ENG 2
3) 6D12 T/R IND ENG 3
4) 6C12 T/R IND ENG 4
5) 6F13 T/R CONT ENG 1
6) 6E13 T/R CONT ENG 2
7) 6D13 T/R CONT ENG 3
8) 6C13 T/R CONT ENG 4
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE A
OUTBOARD INSTALLATION
INBOARD INSTALLATION
12. ELECTRICAL CONNECTORS SOLENOID VALVE
1. ISOLATION
VALVE
SEE B
PRESSURE SWITCH
BYPASS
VALVE
MANUAL
OVERRIDE
LEVER
FWD
13. HYDRAULIC LINE (4 LOCATIONS)
OUTBOARD STRUT INSTALLATION - ACTIVATED (INBOARD EQUIVALENT)
A
Figure 401 (Sheet 1) Thrust Reverser Isolation Valve
C79191
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
VALVE SCREW
Thrust Reverser Isolation Valve Installation Figure 401 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 864-004-N00
(3) Release the pressure from the applicable main hydraulic system and reservoir (Ref 29-11-00/201).
S 844-005-N00
CAUTION: BE PREPARED TO CATCH THE HYDRAULIC FLUID IN THE APPLICABLE
_______ CONTAINERS. IF THE HYDRAULIC FLUID FALLS INTO THE ENGINE, QUICKLY CLEAN THE ENGINE. IF YOU DO NOT QUICKLY CLEAN THE HYDRAULIC FLUID, THE HYDRAULIC FLUID CAN CAUSE DAMAGE TO THE ENGINE.
(4)
Drain the applicable hydraulic system reservoir into the container (Ref 12-12-01/301).
S 434-037-N00
(5)
When the hydraulic fluid has drained, close the drain valve.
(a) Install the lockwire on the drain valve.
S 014-006-N00
(6)
To get access to the isolation valve installation on the inboard strut, remove the no. 3 forward strut fairing.
S 014-007-N00
(7)
To get access to the isolation valve installation on the outboard strut, remove the no. 4 forward strut fairing.
S 034-008-N00
(8)
Disconnect the electrical connectors (12).
S 034-009-N00
(9)
Disconnect the four hydraulic lines (13).
(a) Install the protection caps on the hydraulic lines (13).
S 034-010-N00
(10)
Loosen the brackets on the hydraulic lines as it is necessary to get the correct clearance to remove the isolation valve (1).
S 024-011-N00
(11)
To remove the isolation valve, do the steps that follow:
(a)
Remove the two bolts (2), washers (4), and nuts (5) from the isolation valve (1).
(b)
Remove the bolt (2), two washers (3 and 4), jumper wire (6), and nut (5), from the isolation valve (1).
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