S 714-078

 (25)
 Do the system test of the nose wheel steering (AMM 32-51-00/501).

 S 714-053

 (26)
 Do these tasks (AMM 32-61-01/201):

 -measure the nose gear squat gaps
 -test the nose gear squat switches
 NOTE: Make sure the squat sensor works correctly.
____
 S 714-054
 (27) Do the system test of the alternate extension system for the nose landing gear (AMM 32-35-00/501).
 NOTE: The alternate extension of the nose landing gear is
____ necessary.
 S 494-057
 (28)
 Install the ground locks (AMM 09-11-00/201).

 S 864-058

 (29)
 Remove the hydraulic power if it is not necessary (AMM 29-11-00/201).

 S 864-060

 (30)
 Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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A
747-400 MAINTENANCE MANUAL
 S 864-090
 (31) Lower the airplane and remove the jacks (AMM 07-11-01/201).
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747-400 MAINTENANCE MANUAL
 NOSE LANDING GEAR - INSPECTION/CHECK
____________________________________
 1.  General
_______
 A.  This procedure contains a task to measure the fit of these parts on the nose landing gear:
 (1)  
The bolt, bushings and bearings which connect the retract actuator to the trunnion

 (2)  
The trunnion bearing and the related bolts and bushings in the trunnion bearing assembly.

 B.  
To do this procedure, you must disconnect the retract actuator and remove the nose landing gear.

 TASK 32-21-01-206-001
 2.  Nose Landing Gear Inspection (Fig. 601)
____________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometers, inner and outer diameter

 B.  
References

 (1)  
AMM 20-11-01/401, Bearings and Bushings

 (2)  
AMM 32-21-01/401, Nose Landing Gear

 (3)  
AMM 32-21-05/601, Nose Gear Tripod Brace Assembly

 (4)  
AMM 32-34-01/401, Nose Landing Gear Retract Actuator

 (5)  
AIPC 32-21-01 Fig. 2, AIPC 32-21-02 Fig. 1, AIPC 32-21-04 Fig. 5, AIPC 32-34-01 Fig. 2

 C.  
Access

 (1)  
Location Zone
 715 Nose Landing Gear

 D.  
Procedure

 (1)  
Disconnect the retract actuator at the trunnion clevis.

 (2)
Do this task: "Nose Landing Gear Removal" (Ref 32-21-01/401).

 S 026-008
 S 026-002
 NOTE: You can examine the retract actuator connection with the
____ nose landing gear on the airplane. You must remove the nose landing gear to examine the trunnion bearings.
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747-400 MAINTENANCE MANUAL
 S 216-000
 (3)  
Do an external inspection of the components on the nose landing gear.

 (a)  
Examine the shock strut, the drag strut, the drag braces, and the tripod braces for corrosion and damage.

 (b)  
Examine all of the pin connections on the nose landing gear for corrosion and damage.

 S 226-006
 (4)  
Examine the fit of the trunnion bearings.

 (a)  
Measure the parts at the locations shown in Figure 601.
　
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