F.
The alternate brake hydraulic system pressure switch is installed on the ceiling in the wheel well for the left wing gear.
G.
The hydraulic system 4 pressure switch is installed on the ceiling in the wheel well for the left wing gear.
TASK 32-41-14-004-001
2. Alternate Brake Hydraulic System Pressure Switch - Removal (Fig. 401)__________________________________________________________
A. General
(1)
In subsequent steps, the alternate brake hydraulic system pressure switch is referred to as the pressure switch.
B.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
AIPC 32-41-14 Fig. 2
(5)
SSM 32-41-02
(6)
WDM 32-41-11
C.
Access
(1)
Location Zone
135 Wing Landing Gear Well - Left
D.
Prepare for the Removal
S 844-047
(1) Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
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32-41-14
ALL ú ú 01 Page 401 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
LEFT WHEEL WELL FOR
THE WING LANDING GEAR
ALTERNATE BRAKE HYDRAULIC
SYSTEM PRESSURE SWITCH
ELECTRICAL
SEE A CONNECTOR
CEILING OF THE WHEEL WELL
BACKUP
RINGS HYDRAULIC SYSTEM 4 PRESSURE SWITCH
SEE B PRESSURE SWITCH
O-RINGS
SUPPORT
BRACKET
MANIFOLD
ELECTRICAL ALTERNATE BRAKE HYDRAULIC SYSTEM PRESSURE SWITCH CONNECTOR A PRESSURE SWITCH
BACKUP RINGS
MANIFOLD
SUPPORT O-RINGS
BRACKET
AFT BULKHEAD OF THE WHEEL WELL
HYDRAULIC SYSTEM 4 PRESSURE SWITCH
B
Hydraulic Brake Pressure SwitchesFigure 401
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32-41-14
ALL ú ú 01 Page 402 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 844-049
(2) Make sure the wheel chocks are installed.
S 494-051
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 494-053
(4)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
S 844-055
(5)
Remove the pressure from hydraulic systems 1 and 2
(AMM 29-11-00/201).
E.
Procedure
S 034-057
(1)
Disconnect the electrical connector, DS1887, from the pressure switch.
S 034-059
(2)
Remove the lockwire that safeties the pressure switch to the manifold.
S 024-042
(3)
Turn the pressure switch counterclockwise at the lands at its base, to remove it from the manifold.
S 914-061
(4)
Install a plug in the open port on the manifold.
(5)
Remove the O-rings from the pressure switch and discard them.
S 034-063
TASK 32-41-14-004-038
3. Hydraulic System 4 Pressure Switch - Removal (Fig. 401)____________________________________________
A. General
(1)
In subsequent steps, the hydraulic system 4 pressure switch is referred to as the pressure switch.
B.
References
(1)
AMM 09-11-00/201, Towing
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