(4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (6)  
AMM 32-00-30/201, Landing Gear Door Locks

 D.
Access

 (1)  
Location Zone
 135 Wing Landing Gear Wheel Well, LH
 136 Wing Landing Gear Wheel Well, RH
 137 Body Landing Gear Wheel Well, LH
 138 Body Landing Gear Wheel Well, RH
 735 Wing Landing Gear, LH
 745 Wing Landing Gear, RH
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 E.
Preconditions

 S 865-144
 (1)  
These conditions are necessary for this task:

 (a)  
The airplane is on jacks (AMM 07-11-01/201).

 (b)  
Electrical power is available (AMM 34-22-00/201).

 (c)  
The Intergrated Display System (IDS) is serviceable (AMM 31-61-00/501).

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

 (e)  
The hydraulic systems No. 1 and 4 are serviceable (AMM 29-11-00/201).

 F.
Prepare for Test

 S 485-114
 WARNING: MAKE SURE THAT THE GROUND LOCKS ARE INSTALLED IN ALL OF THE
_______ LANDING GEAR BEFORE YOU MOVE THE CONTROL LEVER. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  Make sure the ground locks are installed in the nose and main landing gear (AMM 09-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 585-115
 (2)  
Lift the airplane on jacks (AMM 07-11-01/201).

 S 585-116

 (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 865-117
 (4)  
Make sure the control lever for the landing gear is in the OFF position.

 S 865-118

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

 (a)  
P7 On the overhead circuit breaker panel, P7: 1) 7A03 AURAL WARN L 2) 7A04 AURAL WARN R

 S 865-125
 (6)  
Supply electrical power (AMM 24-22-00/201).

 S 865-145

 (7)
Push the GEAR pushbutton switch on the EICAS display select panel.

 (a)  
Make sure the lower EICAS display shows the gear synoptic page.

 G.
Main Gear and Main Gear Doors Extension and Retraction Test.

 S 865-120
 WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL
_______ SURFACES, THE THRUST REVERSERS, AND THE LANDING GEAR. THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1) Supply hydraulic power to systems No. 1 and 4 (AMM 29-11-00/201).
 S 865-121
 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 865-122

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-123
 (4)  
Make sure that the RCDU GND TESTS switch is in the NORMAL position.

 S 735-124

 (5)  
Do these steps to test the main gear and main gear door indication:

 (a)  
Move the control lever for the landing gear to the DN position. 1) Make sure the upper EICAS display does not show the GEAR DOOR (ADVISORY) message.
　
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