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747-400 MAINTENANCE MANUAL
 S 492-042
 (3)  Do this task: Installation of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).
 S 042-043
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Do this task: Prepare the Safety-Sensitive Systems for Air Mode Simulation (Ref 32-09-02/201).

 S 862-005

 (5)  
For removal of the alternate sensor, open this circuit breaker on the Overhead Circuit Breaker Panel, P7 and install a DO-NOT-CLOSE tag:

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

 S 862-044
 (6)  
For removal of the primary sensor, open this circuit breaker on the Overhead Circuit Breaker Panel, P7 and install a DO-NOT-CLOSE tag:

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

 E.
Remove the Uplock Sensor (Fig. 201)

 (1)  
Remove the cover from the junction box (J19 LH, J20 RH).

 S 032-045

 (2)  
Disconnect the sensor wires as follows:

 (a)  
Remove the sealant (potting) material from the electrical terminals with the plastic scraper.

 S 012-007
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747-400 MAINTENANCE MANUAL
JUNCTION BOX,
J19 (LEFT),J20 (RIGHT)

SEE A
TERMINAL BOARD, T380 (LEFT), T381 (RIGHT)
SEE B
SHOCK STRUT
FWD  A  A 
(PRIMARY UPLOCK SENSOR), S402 (RIGHT) S400 (LEFT), 2. MOUNTING NUT 1. SENSOR  UPLOCK HOOK  CONDUIT  6. LOCK 5. NUT WASHER 
3. CONDUIT NUT  A  7. WASHER 8. TERMINAL LUG 
4. SHIMS 
3. CONDUIT NUT 
0.05 |0.01 INCH CLEARANCE (ALTERNATE UPLOCK SENSOR), S1637 (RIGHT) S1636 (LEFT),A-A 2. MOUNTING NUT 1. SENSOR  B  J BOX  TERMINAL STRIP 

Body Gear Uplock Sensor Installation
Figure 201

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747-400 MAINTENANCE MANUAL
 (b)  Make a record of the connection of the wires at the terminal strip.
 NOTE: This will help you during the installation of the new
____
 wires.

 (c)  
Disconnect the sensor wires from the terminal strip.

 (d)  
Carefully remove the terminal lugs (8) from wires.

 (e)  
Attach a line to the ends of the sensor wires to help you during the installion of the sensor wires.

 NOTE: Make sure the line is longer than the length of the
____
 conduit.

 S 022-008
 (3)  
Remove the uplock sensor (1) as follows:

 (a)  
Remove the conduit nut (3).

 (b)  
Remove the sensor mounting nut (2).

 (c)  
Remove the sensor (1).

 (d)  
Carefully pull the sensor wires from the conduit.

 NOTE: Do not pull the line out of the conduit.
____
 TASK 32-61-11-402-009
 3. Install the Uplock Sensor for the Body Gear
___________________________________________
 A. Consumable Materials
 (1)  
A00704 Sealant - Silicone, RTV 162

 (2)  
B00083 Solvent - Aliphatic Naphtha, TT-N-95, Type 2

 (3)  
C00582 Primer - SS-4004

 B. Parts ~.............................................................................. | AMM | | AIPC | ................. ...........................| | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ...............................................................................| | 201 | 1 | Sensor | 32-61-02 | 21 | 55 | | | 2 | Sensor Mounting Nut | | | 45 | | | 4 | Shim | | | 60 | | | 5 | Nut | 32-61-75 | 01 | 72 | | | 6 | Lock Washer | | | 73 | | | 7 | Washer | | | 74 | 2......…........…...................................…...........…......….......1
　
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