(b)  
7F22, LANDING GEAR DSP & CONT PRI

 S 722-047
 (3)  
Do the task which does a test of the tilt sensors.

 S 862-048

 (4)  
Open this circuit breaker (as applicable) on the overhead circuit breaker panel, P7 and attach a DO-NOT-CLOSE tag:

 (a)  
7F23, LANDING GEAR DSP & CONT ALTN

 (b)  
7F22, LANDING GEAR DSP & CONT PRI

 S 432-049
 (5)  Continue the installation procedure.
 CAUTION:_______MAKE SURE YOU SEAL THE ELECTRICAL TERMINALS. IF YOU DO NOT SEAL THE ELECTRICAL TERMINALS, CONTAMINATION CAN GO INTO THE JUNCTION BOXES AND CAUSE DAMAGE TO THE ELECTRICAL CONNECTIONS.
 (a)  
Seal the electrical terminals. 1) Clean the bare surface of the terminals with the solvent. 2) Apply a thin layer of the primer on the bare surface of the

 terminals and let the primer dry. 3) Apply the sealant on the surface of the terminals with a short bristle brush.

 (b)  
Tighten the conduit nut to the sensor by hand.

 (c)  
Install a lockwire to the conduit nut.

 (d)  
Install the junction box cover.

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747-400 MAINTENANCE MANUAL
 S 862-013
 (6)  
Remove the DO-NOT-CLOSE tag and Close this circuit breaker (as applicable) on the overhead circuit breaker panel, P7:

 (a)  
7F23, LANDING GEAR DSP & CONT ALTN

 (b)  
7F22, LANDING GEAR DSP & CONT PRI

 TASK 32-61-12-822-019
 4.  Adjust the Truck Tilt Sensor____________________________
 A. References
 (1)  
07-11-01/201, Jacking Airplane

 (2)  
09-11-00/201, Towing

 (3)  
29-11-00/201, Main Hydraulic Supply System

 (4)  
32-00-30/201, Landing Gear Door Locks

 (5)  
IPC 32-61-12 Fig. 1

 B.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 C.
Prepare for the Adjustment

 S 492-032
 WARNING: MAKE SURE THE GROUND LOCKS ARE INSTALLED ON THE NOSE AND MAIN
_______ LANDING GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Make sure the ground locks for the main landing gear are installed (Ref 09-11-00/201).
 S 492-021
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  Make sure the door locks on the main landing gear are installed (AMM 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 S 862-022
 (3)  
Make sure the control handle for the landing gear is in the DN position.

 S 582-023

 (4)  
Lift the airplane on jacks until all wheels are clear of the ground (Ref 07-11-01/201).

 S 862-024
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE WHEEL PATH
_______ BEFORE THE HYDRAULIC SYSTEM IS PRESSURIZED. THE FRONT WHEELS OF THE LANDING GEAR WILL MOVE AT AN ANGLE WHEN THE HYDRAULIC SYSTEM IS PRESSURIZED. MOVEMENT OF THE FRONT WHEELS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)
Supply power to the No. 1 hydraulic system (Ref 29-11-00/201).

 D.
Adjust the Truck Tilt Sensor

 S 032-026
 (1)  
Remove the sensor mounting bolts.

 S 822-027

 (2)  
Install the shims between the truck tilt sensor and the sensor support bracket.

 S 822-033

 (3)  
Remove the necessary shim laminations to get the correct clearance (Fig. 201).
　
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