L OR R MAIN GEAR
DOOR SAFETY VALVE
DOOR-OPERATED
GEAR SEQUENCE VALVE SEE I SHT 4

SEE H SHT 4
L OR R MAIN GEAR DOOR ACTUATOR SEE G KEEL
FWD
BEAM (REF)
L OR R MAIN GEAR DOOR UNSAFE LIGHT, L505 OR L490
L OR R MAIN GEAR DOOR ACTUATOR
SEE M SHT 5
G
L OR R MAIN GEAR DOOR RELEASE INTERLOCK ACTUATOR, M10280 OR M10279
SEE K SHT 4
MAIN GEAR DOOR (REF)
L OR R MAIN GEAR DOOR LOCK RELEASE ACTUATOR
SEE L SHT 5
LEFT MAIN WHEEL WELL KEEL BEAM
(RIGHT SIMILAR)

F FROM SHT 1
Component Location
Figure 102 (Sheet 3)

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FAULT ISOLATION/MAINT MANUAL

LEFT OR RIGHT MAIN GEAR
VALVE DOOR LOCKED SWITCH,
S10364 OR S10363
SEE J
VALVE
CONTROL ROD (REF)
FWD
LEFT OR RIGHT MAIN GEAR DOOR SAFETY VALVE
I FROM SHT 3
LEFT OR RIGHT MAIN GEAR DOOR-OPERATED GEAR SEQUENCE VALVE
H FROM SHT 3
SWITCH
ACTUATOR
DOOR SAFETY SOLENOID
VALVE CAM (REF)(REF)
LEFT OR RIGHT MAIN GEAR DOOR RELEASE LOCKED SWITCH, S10364 OR S10363 INTERLOCK ACTUATOR LEFT OR RIGHT MAIN GEAR DOOR
K FROM SHT 3
J
Extension and Retraction - Component Location
Figure 102 (Sheet 4)

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757 FAULT ISOLATION/MAINT MANUAL
CONTROL RODS (REF)
ACTUATOR  FWD
L OR R MAIN GEAR DOOR UNSAFE LIGHT, L505 OR L490
M FROM SHT 3
RETURN
SPRING
(REF)

FWD
L OR R MAIN GEAR DOOR LOCK
RELEASE ACTUATOR
L FROM SHT 3

LANDING GEAR SELECTOR VALVE
SEE O SHT 6
MAIN WHEEL WELL
SEE N
ALTERNATE EXTENSION SYSTEM POWER PACK, M10231
SEE P SHT 6
RIGHT MAIN WHEEL WELL (ONLY)
N

Component LocationFigure 102 (Sheet 5)

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FAULT ISOLATION/MAINT MANUAL

MOTOR (REF)
QUADRANT (REF) CONTROL VALVE  FROM SHT 5O SELECTOR VALVE LANDING GEAR  (REF) PUMP 
Q SHUTTLE VALVE TRUCK POSITIONER MAIN GEAR SEE  FROM SHT 5 SYSTEM POWER PACK, M10231 ALTERNATE EXTENSION P 
R DOOR SEQUENCE VALVE DOWNLOCK-OPERATED MAIN GEAR SEE 
FWD 
PRESSURE SWITCH, S452 OR S453 L OR R GEAR TILT 
ACTUATOR DOWNLOCK MAIN GEAR SSEE  L OR R MAIN GEAR TRUCK POSITIONER SHUTTLE VALVE Q 

VALVE 
MAIN GEAR UPPER 
DOWNLOCK LINK (REF) 
L OR R MAIN GEAR DOWNLOCK-OPERATED  L OR R MAIN GEAR 
DOOR SEQUENCE VALVE  DOWNLOCK ACTUATOR 
R  S 

Component Location
Figure 102 (Sheet 6)

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757 FAULT ISOLATION/MAINT MANUAL
WING ACCESS PANEL, 551 BB OR 651 BB
L OR R MAIN GEAR 
RETRACT ACTUATOR  INBD 
SEE  T 
L OR R MAIN GEAR RETRACT ACTUATOR 
T 

BLEED PLUG 
L OR R MAIN GEAR 
TRUCK POSITIONER 
ACTUATOR 
SEE AL 
L OR R MAIN GEAR TRUCK 
POSITIONER ACTUATOR 
AL 
Component Location
Figure 102 (Sheet 7) 

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FAULT ISOLATION/MAINT MANUAL

NOSE GEAR
NOSE GEAR DOOR SAFETY
DOOR ACTUATOR VALVE
SEE AA SHT 10 SEE Z SHT 9
NOSE GEAR
DOOR RELEASE
INTERLOCK ACTUATOR,
M10281

FLOW CONTROLSEE Y SHT 9NOSE WHEEL VALVE
WELL SEE U
NOSE GEAR
DOOR-OPERATED
SEQUENCE VALVE

SEE AD SHT 10
NOSE GEAR DOOR NOSE GEARCLOSED SWITCH, DOOR UNSAFES10372 LIGHT, L489 SEE AC SHT 10
SEE AB SHT 10 FWD
NOSE GEAR GEAR
SEQUENCE VALVE

NOSE GEAR
BYPASS VALVE
HYDRAULIC ALTERNATE
PRESSURE  SEE X SHT 9
UPLOCK RELEASE
SWITCH, S10366
ACTUATOR
SEE V SHT 9

SEE W SHT 9
NOSE GEAR 
DOOR LOCK 
FWD  RELEASE ACTUATOR 
GEAR-OPERATED NOSE GEAR  SEE  AE  SHT 10 
SEQUENCE VALVE 
SEE AG  SHT 11 
NOSE GEAR 
　
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