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747-400 MAINTENANCE MANUAL
 S 654-023
 (13) Repair and adjust the latches if it is necessary (AMM 54-62-02/501).
 S 414-019 CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
 (14) Close the doors in the applicable trailing edge fairing (AMM 54-62-00/201).
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747-400 MAINTENANCE MANUAL
 RESERVOIR LOW PRESSURE WARNING SWITCH - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the switch for the low pressure warning for the reservoir. The second task installs the switch. The second task also does a test of the switch.
 B.  The switch is in the aft fairing of the engine strut. You must open a door in the trailing edge fairing to get access to the switch.
 C.  The procedure is the same for the switch in each hydraulic system.
 TASK 29-17-08-004-001
 2.  Reservoir Low Pressure Warning Switch Removal (Fig. 401)
_____________________________________________
 A.  References
 (1)
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)
AMM 36-00-00/201, Pneumatic System

 (3)
AMM 54-62-00/201, Nacelle Strut Access Panels

 (4)
IPC 29-17-51 Fig. 1

 B.  
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 464 System 2 - Strut Aft Fairing
 474 System 3 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel
 454A Trailing Edge Fairing Doors - System 1
 464A Trailing Edge Fairing Doors - System 2
 474A Trailing Edge Fairing Doors - System 3
 484A Trailing Edge Fairing Doors - System 4

 C.  
Procedure

 (1)
Open the doors in the trailing edge fairing (AMM 54-62-00/201).

 S 014-002
 S 864-031
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC SYSTEM BEFORE
_______ YOU OPEN THE PNEUMATIC SYSTEM. THE AIR, WHICH HAS HIGH TEMPERATURE AND PRESSURE, CAN CAUSE INJURY TO PERSONS.
 (2) Release the pressure in the pneumatic system (AMM 36-00-00/201).
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MAINTENANCE MANUAL

SWITCH SEE A TO THE RESERVOIR
MANIFOLD
JOINT BETWEEN 
THE SWITCH AND  FROM THE RESERVOIR 
THE MANIFOLD  PRESSURIZATION 
SEE  B  MODULE 
LOCKWIRE 

SWITCH
FWD
BONDING JUMPER
NUT BOLT WASHERS
ELECTRICAL
CONNECTOR
SEE C SWITCH
A
CONNECTOR
O-RING  ADAPTER
MANIFOLD
COLLAR O-RING
SWITCH
BACKSHELL
JOINT BETWEEN THE SWITCH AND THE MANIFOLD ELECTRICAL CONNECTOR
B C
Reservoir Low Pressure Warning Switch Installation Figure 401
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MAINTENANCE MANUAL

 S 864-004
 (3)  
Release the pressure in the hydraulic system and the reservoir (AMM 29-11-00/201).

 S 864-005