(b)  
Install the position indicator in the mounting hole.

 (c)  
Install four screws.

 S 864-007
 (2)
Remove the DO-NOT CLOSE tags and close these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6K23, STAB TRIM POSN IND L
 2) 6K24, STAB TRIM POSN IND R

 S 714-006
 (3)  Do this task "Operational Test - Stabilizer Trim Indicating System" (AMM 27-48-00/501).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 NOSE GEAR PRESSURE SWITCH - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  There are three tasks in this procedure. The first task locks out the nose landing gear and doors while working in the NLG area. The other tasks are for the removal and the installation of the nose gear pressure switch (which is referred to as the "pressure switch"). The procedure has these parts:
 (1)  
The installation of the ground locks on the landing gear and the door locks on the nose gear.

 (2)  
The removal of the pressure switch.

 (3)  
The installation of the replacement pressure switch.

 TASK 27-48-03-004-001
 2.  Nose Gear Pressure Switch Removal (Fig. 401)_________________________________
 A.  Special Tools and Equipment
 (1)  
G12001-50 - Rig Pin Kit

 B.  
References

 (1)  
09-11-00/201, Towing

 (2)  
32-00-30/201, Landing Gear Door Locks

 (3)  
IPC 32-21-01 Fig. 4

 (4)  
SSM 31-51-13

 (5)  
WDM 31-51-11

 C.  
Access

 (1)  
Location Zone
 114 Nose Gear Wheel Well, RH

 D.  
Procedure

 S 494-002
 (1)  Make sure you install the landing gear ground locks. (Ref 09-11-00/201).
 S 494-003
 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.
 (2)  
Do this task: "Installation of the Door Locks on the Nose Landing Gear" (Ref 32-00-30/201).

 S 024-004

 (3)  
Remove the pressure switch:

 (a)  
Turn the shutoff valve handle clockwise to the fully closed position.

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747-400
MAINTENANCE MANUAL

SHUTOFF VALVE
AIR VALVE
SEE A  PRESSURE SWITCH
SHOCK STRUT
SEE B
A1
PRESSURE GAGE TUBE
SHUTOFF VALVE
PRESSURE SHOCK STRUT
SWITCH
SHOCK STRUT
PRESSURE GAGE TUBE
PRESSURE GAGE FWD
A2
AIR VALVE
B2
1
AIRPLANES WITHOUT SHOCK STRUT PRESSURE GAGE
2
AIRPLANES WITH SHOCK STRUT PRESSURE GAGE
Nose Gear Pressure Switch Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 (b)  
Install rig pin G12001-10 to hold it in the closed position.

 (c)  
Disconnect the electrical connector DS113.

 (d)  
Remove the sealing compound from around the switch.

 (e)  
　
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