(3)  
The nose gear actuator acts directly on the nose gear trunnion. A small actuator operates to lock and to unlock the nose gear. A bypass valve linked to the nose gear lock mechanism prevents hydraulic pressure from reaching the nose gear actuator before the gear unlocks. A valve is incorporated to cut off the steering system hydraulic pressure when the nose gear is retracted. Nose gear doors are operated by gear retraction and extension movements through a cable system.

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 32-21-00
 ALL  ú ú 01 Page 10 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
NOSE GEAR
FIG.
COMPONENT
ACCESS/AREA
REFERENCE
102
QTY
SHT

1
32-21-07
ASSEMBLY - BULLNOSE
NOSE GEAR
1
NOSE GEAR
32-21-06
ASSEMBLY - SIDE BRACE
1
NOSE GEAR
32-21-05
ASSEMBLY - TRIPOD BRACE
1
32-21-08
FITTING - TOWING
NOSE GEAR
1
NOSE GEAR
32-21-01
GEAR - NOSE LANDING
1
NOSE GEAR
32-21-03
LINKS - TORSION
1
NOSE GEAR
32-21-04
STRUT - DRAG
1
NOSE GEAR
32-21-02
STRUT - SHOCK
Nose Gear - Component Index
Figure 101

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
FAULT ISOLATION/MAINT MANUAL

TRUNNION (REF)
DRAG STRUT
SHOCK STRUT
BULLNOSE ASSEMBLY
TRIPOD BRACE SIDE BRACE
ASSEMBLYASSEMBLY
NOSE WHEEL WELL
CONTROL PANEL (REF)

TORSION
LINKS
TOW FITTING
Nose Landing Gear Component Location
Figure 102

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A
747-400 MAINTENANCE MANUAL
 NOSE LANDING GEAR - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A. This procedure has two tasks:
 (1)
The removal of the nose landing gear from the airplane

 (2)
The installation of the nose landing gear on the airplane.

 TASK 32-21-01-004-001
 2.  Nose Landing Gear Removal (Fig. 401)_________________________
 A. Special Tools and Equipment
 (1)
6PME65B00162-1 Nose Landing Gear Vertical Support (Dolly) Assembly

 (2)
8ME65B01202-3 Nose Gear Shock Strut Retention Tool

 (3)  
G12001 Kit (Rigging Pins) ~.................................................................... | Rigging Pin No. | Length (inch) | Diameter (inch) | ...................................................................... | NS-4 | 2.50 | 0.309 to 0.311 | 2.....................…......................….......................1

 B.
References

 (1)
AIPC 32-21-01, Fig. 2

 (2)
AIPC 32-21-04, Fig. 5

 (3)
AIPC 32-21-05, Fig. 1

 (4)
AIPC 32-22-02, Fig. 1

 (5)
AIPC 32-22-04, Fig. 1

 (6)
AIPC 32-22-63, Fig. 1

 (7)
AIPC 32-34-01, Fig. 2

 (8)
AIPC 32-51-10, Fig. 1

 (9)
AIPC 32-51-51, Fig. 1

 (10)
 AIPC 32-61-70, Fig. 3

 (11)
 AMM 07-11-02/201, Jacking Airplane Nose

 (12)
 AMM 09-11-00/201, Towing

 (13)
 AMM 29-11-00/201, Main Hydraulic Supply System

 (14)
 AMM 32-00-30/201, Landing Gear Door Locks

 (15)
 AMM 32-22-02/401, Aft Nose Wheel Well Doors

 (16)
 AMM 32-22-04/401, Nose Wheel Well Aft Door Operator
　
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