-Body Gear Steering actuators - Supplies a signal when the body gear is centered
 -Landing Gear Lever Switch - Supplies a signal when the landing gear lever is in the DOWN position
 -
Hydraulic System 1 Pressure - Supplies a signal when the pressure is low

 -
Hydraulic System 4 Pressure - Supplies a signal when the pressure is low.

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A

747-400 MAINTENANCE MANUAL
S396 NG UP S397 NG LOCK
S753 PRI LDG LVR DN
S411 NG UP S424 NG LOCK
S753 PRI LDG LVR DN
NOSE SQUAT - ALTERNATE

1 SUPPLIES DISCRETE OUTPUT DRIVER
PSEU Logic Diagram Figure 3 (Sheet 1)

NOSE GEAR UP & LOCK
NOSE GEAR DOWN & LOCK
NOSE GEAR POSN DISAGREE NOSE GEAR NOT DOWN AND LOCKED

NOSE GEAR UP & LOCK
NOSE GEAR DOWN & LOCK
NOSE GEAR POSN DISAGREE
NOSE GEAR NOT DOWN AND LOCKED

1
1

1
1
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A
747-400
MAINTENANCE MANUAL

B

S753 PRIMARY LVR DN
INPUTS  OUTPUTS

A
UP

C

DN
D
WING AND BODY GEAR INDICATION - PRIMARY

GEAR  INPUTS  OUTPUTS 
POSITION  UP DN  A  B  C  D 
LWG  S398  S399  LWG UP  UP DISAGREE  DN DISAGREE  LWG DN 
LBG  S400  S401  LBG UP  UP DISAGREE  DN DISAGREE  LBG DN 
RBG  S402  S403  RBG UP  UP DISAGREE  DN DISAGREE  RBG DN 
RWG  S404  S405  RWG UP  UP DISAGREE  DN DISAGREE  RWG DN 

WING AND BODY INDICATION-PRIMARY

PSEU Logic Diagram
Figure 3 (Sheet 2)

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A
747-400 MAINTENANCE MANUAL
INPUTS OUTPUTS UP
A

B S753 ALTERNATE LVR DN

C
DN
D
WING AND BODY GEAR INDICATION - ALTERNATE
GEAR  INPUTS  OUTPUTS 
POSITION  DNUP  A  B  C  D 
LWG  S1638  S415  LWG UP  UP DISAGREE  DN DISAGREE  LWG DN 
LBG  S1636  S414  LBG UP  UP DISAGREE  DN DISAGREE  LBG DN 
RBG  S1637  S413  RBG UP  UP DISAGREE  DN DISAGREE  RBG DN 
RWG  S1639  S412  RWG UP  UP DISAGREE  DN DISAGREE  RWG DN 

WING AND BODY INDICATION - ALTERNATE

PSEU Logic Diagram
Figure 3 (Sheet 3)

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A
747-400
MAINTENANCE MANUAL

S417 LWG TRK TILT
S401 LBG DN S419 LBG TRK TILT
S418 RBG TRK TILT S4O3 RBG DOWN
S416 RWG TRK TILT HYD SYS #4 PRESS
HYD SYS #1 PRESS
S800 NOSE GEAR NOT COMPRESSED
S615 LWG TRK TILT
S414 LBG DOWN S612 LBG TRK TILT
S613 RBG TRK TILT S413 RBG DOWN
S614 RWG TRK TILT PRESS HYD SYS 4B PRESS HYD SYS 1B
S801 NOSE GEAR NOT COMPRESSED

LANDING GEAR POSITION INDICATION & CONTROL - ALTERNATE
SUPPLIES DISCRETE OUTPUT DRIVER
PSEU Logic DiagramFigure 3 (Sheet 4)
　
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本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 起落架 LANDING GEAR 1(44)