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

 (j)  
Install the lockwire on the conduit nut.

 (2)  
Install the junction box cover (J56 LH, J57 RH).

 S 864-026

 (3)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the overhead circuit breaker panel, P7:

 (a)  
7F23 LANDING GEAR DSP & CONT ALTN

 (b)  
7F22 LANDING GEAR DSP & CONT PRI

 S 414-013
 S 444-030
 (4)  
Put the airplane back to the ground mode (AMM 32-09-02/201).

 E.  
Do a Test of the Downlock Sensor

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-017
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747-400 MAINTENANCE MANUAL
 (2)  S 714-018Do the ground test for the PSEU (AMM 32-09-03/501).
 (3)  S 864-019Remove the electrical power if it is not necessary (AMM 24-22-00/201).
 S 094-027

 WARNING: DO THE STEPS CAREFULLY IN THE TASK BELOW TO REMOVE THE DOOR
_______ LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Do this task: Removal of the Door Locks from the Wing Landing Gear (AMM 32-00-30/201).

 S 094-031

 (5)  
Do this task: Removal of the Door Locks from the Body Landing Gear (AMM 32-00-30/201).

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MAINTENANCE MANUAL

 BODY GEAR UPLOCK SENSORS - MAINTENANCE PRACTICES
________________________________________________
 1.  General_______
 A.  This procedure has these five tasks:
 (1)  
Removal of the uplock sensors for the body gear

 (2)  
Installation of the uplock sensors for the body gear

 (3)  
Adjustment of the uplock sensors for the body gear (Airplane Not On Jacks)

 (4)  
Adjustment of the uplock sensors for the body gear (Airplane On Jacks)

 NOTE: It is only necessary to do one of the adjustment procedures.
____
 (5)  
Test of the uplock sensors for the body gear.

 B.  
The uplock sensors for the body gear (primary: S400 LH, S402 RH) (alternate: S1636 LH, S1637 RH) are attached to the uplock mechanism, adjacent to the uplock hook. The uplock mechanism is attached to a bracket that is on the aft bulkhead in the wheel well for the body gear.

 C.  
The procedures for the primary and the alternate sensors is the same.

 TASK 32-61-11-002-001
 2.  Remove the Uplock Sensor for the Body Gear__________________________________________
 A.  Standard Tools and Equipment
 (1)  
Plastic Scraper that is not abrasive or conductive

 B.  
References

 (1)  
09-11-00/201, Towing

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

 (3)  
32-09-02/201, Air/Ground Relay System

 (4)  
IPC 32-61-02 Fig. 21

 C.  
Access

 (1)  
Location Zone 137 Body Gear Wheel Well, Aft Bulkhead, Left Gear 138 Body Gear Wheel Well, Aft Bulkhead, Right Gear

 D.  
Prepare for the Removal

 S 492-002
 (1)  Make sure that all of the ground locks for the landing gear are installed (Ref 09-11-00/201).
 S 492-003
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  Do this task: Installation of the Door Locks on the Wing Landing Gear (AMM 32-00-30/201).
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