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747-400 MAINTENANCE MANUAL
 BODY GEAR DOWNLOCK SENSORS - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. These tasks remove and install the downlock sensor for the body landing gear.
 B.  The primary (S401, left and S403, right) and the alternate (S414, left and S413, right) downlock sensors attach to the upper jury strut at the jury strut apex.
 C.  It is not necessary to lift the airplane with a jack. You adjust the clearance between the sensor and the target with the gear in the down position.
 TASK 32-61-10-004-001
 2.  Remove the Downlock Sensor for the Body Gear____________________________________________
 A.  Standard Tools and Equipment
 (1)
Plastic Scraper - that is not abrasive, that is not a conductor

 B.  
References

 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

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

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

 C.  
Access

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

 D.  
Prepare for the Removal

 (1)  
Install the ground locks in all the landing gear (AMM 09-11-00/201).

 S 494-021
 S 494-022
 WARNING: DO THE STEPS CAREFULLY 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 Wing Landing Gear (AMM 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-61-10
 ALL  ú ú 01 Page 401 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 494-024
 (3)  Do this task: Installation of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).
 S 044-028
 WARNING: DO THE STEPS CAREFULLY IN 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 Safety-Sensitive Systems for Air Mode Simulation (AMM 32-09-02/201).

 S 864-005

 (5)  
Open these circuit breakers on the overhead circuit breaker panel, P7, and attach the DO-NOT-CLOSE tags:

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

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

 E.
Remove the Downlock Sensor (Fig. 401)

 S 014-007
 (1)  
Remove the cover from the junction box (J56 LH, J57 RH).

 S 034-029

 (2)  
Disconnect the sensor wires:

 (a)  
Remove the sealing compound from the electrical terminals with the plastic scraper.

 (b)  
Make a note of the terminal positions and the wire color.

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

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

 (e)  
Attach a line to the sensor wires that is longer than the length of the conduit.

 NOTE: You will use this line to pull the sensor wires through
____ the conduit, during the installation.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-61-10
 ALL  ú ú 01 Page 402 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

TERMINAL STRIP, 
TB348 LEFT, TB349 RIGHT 
SEE  A  S401 LEFT, S403 RIGHT PRIMARY DOWNLOCK SENSOR,  JURY STRUT UPPER  BOX JUNCTION 

FWD TERMINAL STRIP,ALTERNATE DOWNLOCK SENSOR, A TB351 LEFT, TB350 RIGHTS414 LEFT, S413 RIGHT CONDUIT
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