(4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

 (6)  
AIPC 32-11-01 Fig. 1, AIPC 32-12-01 Fig. 2, AIPC 32-12-02 Fig. 2, AIPC 32-12-06 Fig. 3, AIPC 32-12-07 Fig. 2

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747-400
MAINTENANCE MANUAL

 D.  Access
 (1)  
Location Zone
 135 Wing Landing Gear Wheel Well, LH
 136 Wing Landing Gear Wheel Well, RH
 735 Wing Landing Gear, LH
 745 Wing Landing Gear, RH

 E.  
Preconditions

 S 715-148
 (1)  
These conditions are necessary for this task:

 S 865-149

 (2)  
Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).

 S 865-150

 (3)  
The Proximity Switch Electronics Unit (PSEU) is serviceable (AMM 32-09-03/501).

 F.  
Prepare for Test

 S 495-052
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)
Install the ground locks in all landing gear (AMM 09-11-00/201).

 S 585-003

 (2)  
Lift the airplane on jacks (AMM 07-11-01/201).

 S 865-004

 (3)  
Ground the airplane through the bolt heads that are not painted (AMM 20-41-01/201).

 NOTE: The bolt heads are adjacent to the jack pad fittings at Sta
____
 995, WL 116, LBL 130 and RBL 130.

 S 865-005
 (4)  
Make sure the control lever for the landing gear is in the OFF position.

 S 865-006

 (5)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7 Overhead Panel
 1) 7A03 AURAL WARN L
 2) 7A04 AURAL WARN R

 G.  
Do a Test of the Extension and Retraction System for the Wing Landing Gear and Doors.

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747-400 MAINTENANCE MANUAL
 S 865-053
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
 SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER.  AILERONS, RUDDERS,
 ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS
 CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER.  THIS CAN

 CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  Pressurize hydraulic systems No. 1 and 4 (AMM 29-11-00/201).
 S 865-047
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR
_______ OPERATION AREA. A FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Move all persons away from all landing gear doors.

 S 215-038

 (3)  
Make sure the GND TESTS switch on the P461 overhead panel is in the ENABLE position.

 S 215-039

 (4)  
Make sure that the RCDU GND TESTS switch is in the NORMAL position.

 S 735-011

 (5)  
Do a test of the indication for the wing landing gear and door:

 (a)  
Move the control lever for the landing gear to the DN position.

 (b)  
Make sure the GEAR DOOR (ADVISORY) indication is not in view on the top EICAS display.

 (c)  
Make sure the GEAR DISAGREE (CAUTION) indication is not in view on the top EICAS display.

 (d)  
Turn the EIU switch on the P2-4 panel between L, C, and R. 1) Make sure the GEAR DISAGREE (CAUTION) indication does not come into view for the three EIUs.

 2)  Make sure the GEAR DOOR (ADVISORY) indication does not come into view for the three EIUs.

 (e)  
Move the control lever to the OFF position.
　
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