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A
747-400 MAINTENANCE MANUAL
SEEA
WING GEAR
STRUCTURAL FUSE -
TRUNNION
SUPPORT ROD FORK
SEE B
FWD WING GEAR OUTBOARD DOOR FORWARD HINGE FITTING
A
STRUCTURAL FUSE
SUPPORT ROD
B
Structural Fuse - Wing Gear Outboard or Forward Hinge
Figure 4

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A

747-400 MAINTENANCE MANUAL
SEE A
WALKING BEAMS
STRUCTURAL FUSES
FWD
WING GEAR TRUNNION
A

Structural Fuse - Wing Landing Gear Walking Beam
Figure 5

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747-400 MAINTENANCE MANUAL
 LANDING GEAR DOOR LOCKS - MAINTENANCE PRACTICES
_______________________________________________
 1.  General_______
 A.  This procedure contains these fourteen tasks:
 (1)  
Disconnect the operator rods from the nose gear doors

 (2)  
Disconnect the operator rods from the wing gear doors

 (3)  
Disconnect the operator rods from the body gear doors

 (4)  
Install the door locks on the nose gear

 (5)  
Install the door locks on the wing gear

 (6)  
Install the door locks on the body gear

 (7)  
Install the lock on the ground release handle for the main gear doors

 (8)  
Connect the operator rods to the nose gear doors

 (9)  
Connect the operator rods to the wing gear doors

 (10)
 Connect the operator rods to the body gear doors

 (11)
 Remove the door locks from the nose gear

 (12)
 Remove the door locks from the wing gear

 (13)
 Remove the door locks from the body gear

 (14)
 Remove the lock from the ground release handle for the main gear doors.

 WARNING: MAKE SURE YOU USE THE CORRECT DOOR LOCK PROCEDURE TO LOCK THE DOORS
_______ OF THE LANDING GEAR. THE USE OF A DOOR ACTUATOR LOCK IS THE PREFERRED METHOD FOR DISABLING THE DOORS OF THE LANDING GEAR. FAILURE TO USE THE CORRECT METHOD TO LOCK THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 B.  Install the locks on the landing gear doors when it is necessary. You must install locks when persons work in or adjacent to wheel well areas. You must lock open both wing and body gear doors on a side (or both sides if applicable) to prevent injury to persons or damage to equipment.
 C.  You can use the wing and body gear door handle locks as an alternative to the door actuator locks.
 NOTE: The door handle lock does not disable the door operation system.
____ It only stops the door handle from moving. Any movement of the cables attached to the door handle can still cause the door operation system to move the doors.
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747-400 MAINTENANCE MANUAL
 Use the door handle locks when:
 (1)  
It is not necessary to hold the door actuator

 (2)  
The doors will only be open for a short time.

 NOTE: This is during maintenance when only one or two mechanics are
____ working. Do not use door handle locks when other mechanics may be in or around other parts of the landing gear system.
 D.  You must lock the nose gear doors open during maintenance in that area. If door locks are not available, you can disconnect the door operator rods.
　
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