747-400 AMM 飞机维护手册 起落架 LANDING GEAR 3(161)

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 WARNING: WITH AIRPLANE ON JACKS AND GROUND DOOR RELEASE HANDLE IN DOORS OPEN
_______ POSITION, GEAR RETRACTION WILLCAUSE DOORS TO CLOSE. RAPID ACTION OF DOORS MAY INJURE PERSONNEL AND DAMAGE EQUIPMENT.
 D.  If the release handle is inadvertently left in the DOORS OPEN position after maintenance, gear retraction will reposition the system and doors will close after gear is up and locked.
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A
747-400
MAINTENANCE MANUAL

Nose Gear Doors
Figure 1

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747-400
MAINTENANCE MANUAL

DOOR-OPERATED
BELLCRANK NOSE GEAR SEQUENCE
SUPPORT VALVE (REF)
NOSE WHEEL WELL DOOR ACTUATOR
AFT DOOR DRIVE CRANK
BELLCRANK BELLCRANK
GROUND DOOR RELEASE HANDLE
NOSE GEAR WHEEL WELL
FAIRING 
INSTALLATION 
FLAPPER 
DOOR  AFT DOOR 
PUSHROD 

FWD
Nose Gear Door Mechanisms
Figure 2

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747-400 MAINTENANCE MANUAL
 E.  Gear retraction will cause doors to close but the release handle will not completely stow to the DOORS CLOSED position.
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A
747-400 FAULT ISOLATION/MAINT MANUAL
NOSE GEAR DOORS
FIG.
COMPONENT
ACCESS/AREA
REFERENCE
102
QTY
SHT

2
32-22-05
BELLCRANK - NOSE WHEEL WELL FORWARD DOOR
1
NOSE GEAR WHEEL WELL, FORWARD
DOOR OPERATOR ASSEMBLY
32-22-02
2
NOSE GEAR
DOORS - AFT NOSE WHEEL WELL
1
32-22-01
2
NOSE GEQR
DOORS - FORWARD NOSE WHEEL WELL
1
32-22-04
2
NOSE GEAR AFT WHEEL WELL, AFT
OPERATOR - NOSE WHEEL WELL AFT DOOR
2
 DOOR OPERATOR ASSEMBLY
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1
NOSE GEAR FORWARD WHEEL WELL
RODS - NOSE WHEEL WELL FORWARD DOOR OPERATOR
1
FORWARD DOOR OPERATOR ASSEMBLY
Nose Gear Doors - Component Index
Figure 101

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747-400 FAULT ISOLATION/MAINT MANUAL
FORWARD DOOR OPERATOR ASSEMBLY
SEE A
NOSE WHEEL WELL FORWARD DOORS
AFT DOOR
OPERATOR
ASSEMBLY
SEE B SHT 2
FWD FLAPPER DOOR (REF)FLAPPER DOOR (REF) NOSE WHEEL WELL AFT DOORS
FORWARD DOOR
ACTUATOR
(REF)

WHEEL WELL
FORWARD DOOR
BELLCRANK

BELLCRANK SUPPORT FITTING (REF)
WHEEL WELL FORWARD DOOR OPERATOR RODS
FORWARD DOOR OPERATOR ASSEMBLY
A
Nose Gear Doors - Component Location
Figure 102 (Sheet 1)

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