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A
747-400 FAULT ISOLATION/MAINT MANUAL
UPPER PRIMARY LOCK DRAG STRUT
SENSOR, (S397)  (REF) 
NOSE GEAR  ALTERNATE 
LOCK SENSOR  LOCK 
SEE  I  SENSOR, (S424) 

SHIM
NOSE LANDING GEAR (REF)
NOSE GEAR SQUAT SENSOR
SEE J NOSE WHEEL WELL AFT BULKHEAD
FWD NOSE LANDING GEAR SEE K
H FROM SHT 1
NOSE GEAR LOCK SENSOR
I
AFT BULKHEAD NOSE WHEEL WELL (REF) FWDPRIMARY SQUAT SENSOR, S800 (ON RIGHT SIDE OF MOUNTING BRACKET)
FWD PRIMARY UP SENSOR,
ALTERNATE (S396)
SQUAT SENSOR, S801 (ON LEFT SIDE OF MOUNTING BRACKET) ALTERNATE UP
SENSOR, NOSE GEAR SQUAT SENSOR (S411)
NOSE WHEEL WELL AFT BULKHEAD
J K
Landing Gear Indication System - Component Location Figure 102 (Sheet 3)
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A

747-400
FAULT ISOLATION/MAINT MANUAL

WING GEAR 
WHEEL WELL 
INBOARD 
WING GEAR WHEEL WELL  DOOR (REF) 
FORWARD BULKHEAD 
SEE  L  FORWARD 
BULKHEAD 
(REF) 
LH, RH, 
ALTERNATE DOOR  LH, RH, 
WARNING SENSOR  PRIMARY DOOR 
(S395,S426)  WARNING SENSOR 
(S407,S410) 
WING GEAR WHEEL WELL FORWARD BULKHEAD 
L 
BODY GEAR  LH, RH, PRIMARY 
DOWNLOCK  DOWNLOCK SENSOR 
SENSOR  (S399,S405) 
SEE  N 
LH, RH, ALTERNATE 
DOWNLOCK SENSOR 
(S415,S412) 
UPPER JURY 
STRUT (REF) 
WING GEAR 
UPPER TORSION LINK  INBD  FWD 
SEE  O  SHT 5 
LOWER JURY 
INBD  FWD  STRUT (REF) 
WING LANDING GEAR  WING GEAR DOWNLOCK SENSOR 
M  FROM SHT 1  N 

Landing Gear Indication System - Component Location
Figure 102 (Sheet 4)

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A
747-400 FAULT ISOLATION/MAINT MANUAL
WING GEAR UPLOCK MECHANISM
SEE Q
WING GEAR TRUCK 
TILT SENSOR 
(ALTERNATE S615 LEFT, 
S614 RIGHT) 
(PRIMARY S417 LEFT, 
S416 RIGHT) 
UPPER TORSION 
LINK (REF) 
FWD 
WING GEAR 
WING GEAR UPPER TORSION LINK  P  FROM SHT 1 
O 

S404 RIGHT) (PRIMARY S398 LEFT, S1639 RIGHT) (ALTERNATE S1638 LEFT, UPLOCK SENSORS  FWD 
UPLOCK HOOK (REF) 
WING GEAR UPLOCK MECHANISM 
Q 

Landing Gear Indication System - Component Location
Figure 102 (Sheet 5)

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D20442
A
747-400 MAINTENANCE MANUAL
 LANDING GEAR POSITION INDICATION SYSTEM - ADJUSTMENT/TEST
_________________________________________________________
 1.  General_______
 A.  This procedure contains six tasks:
 (1)  Ground Test of the Landing Gear Systems in the PSEU
　
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