SEE C
BODY GEAR UPLOCK SENSORS
SEE A
BODY GEAR
TILT SENSORS
SEE B
FWD
LEFT BODY GEAR SHOWN
BODY GEAR
(RIGHT BODY GEAR EQUIVALENT)
UPLOCK SENSORS (ALTERNATE S1636 LEFT, S1637 RIGHT)BODY GEAR TRUCK (PRIMARY S400 LEFT,TILT SENSOR S402 RIGHT)
(ALTERNATE S612 LEFT,
S613 RIGHT)
(PRIMARY S419 LEFT,
S418 RIGHT) UPLOCK HOOK

BODY GEAR UPLOCK SENSORS
A
PRIMARY DOWNLOCK SENSOR UPPER JURY(S401 LEFT, S403 RIGHT) STRUTSUPPORT
WHEEL TRUCK
FWD
ALTERNATE BODY GEAR DOWNLOCK SENSORS (S414 LEFT, S413 RIGHT)
BODY GEAR TRUCK
TILT SENSOR

BODY GEAR DOWNLOCK SENSORS
CB
Body Gear Sensors
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (3)  
The body gear tilt sensors tell that the body gear is in the correct position to fit into the body gear wheel well. The sensors are on the support bracket attached to the aft truck of each gear. The targets are on the bottom of the upper torsion link. The sensors are near the targets when the body gear is extended and in the tilt position.

 E.
Wing Gear Sensors (Fig. 3)

 (1)  
The wing gear downlock sensors tell that the wing gear is down and jury strut assembly is in the locked position. The wing gear downlock sensors are on the upper jury strut at the jury strut apex. The targets are on the lower jury strut. The targets come near the sensors when the wing gear is in the down and locked position.

 (2)  
The wing gear uplock sensors tell that the wing gear is up and the uplock mechanism is in the locked position. The uplock sensors are above the uplock hook in the uplock mechanism. The targets are in the uplock mechanism. The sensors come near the targets when the wing gear is in the up and locked position.

 (3)  
The wing gear tilt sensors tell that the wing gear is in the correct position to fit into the wing gear wheel well. The sensors are on the bottom of the upper torsion link. The targets are on the shock strut. The sensors come near the targets when the wing gear is entended and the truck is in the tilt position.

 F.
Door Sensors (Fig. 4, 5, 6)

 (1)  
The door sensors come near the targets in the closed position. The door sensors supply a signal to the PSEU. The door position signals go through the PSEU into EICAS display units. The EICAS message GEAR DOOR shows on the main EICAS display unit if any gear door is not closed. The auxillary EICAS display shows the individual gear door position.

 (2)  
The nose door position sensors (Fig. 4) are on the right forward bulkhead in the nose gear wheel well. The targets are forward on the right nose gear wheel well door.

 (3)  
The body gear door position sensors (Fig. 5) are at the botton of the door stop support beam. The targets are on the forward edge of the outboard body gear wheel well door.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WING GEAR UPLOCK SENSORS
SEE A
WING GEAR 
DOWNLOCK SENSORS 
WING GEAR 
TRUCK  SEE  C 
TILT 
SENSORS 
SEE  B 

FWD
UPLOCK SENSORS UPLOCK (ALTERNATE S1638 LEFT, HOOK S1639 RIGHT) (PRIMARY S398 LEFT, S404 RIGHT)
UPLOCK SENSORS
A
ALTERNATE DOWNLOCK SENSORWING GEAR TRUCK (S415 LEFT, S412 RIGHT)
TILT SENSOR (ALTERNATE S615 LEFT, S614 RIGHT) PRIMARY DOWNLOCK SENSOR (PRIMARY S417 LEFT, (S399 LEFT, S405 RIGHT) S416 RIGHT)
UPPER JURYUPPER
STRUT
TORSION LINK FWD
FWD
INBD
LOWER JURY STRUT
TRUCK TILT SENSORS DOWNLOCK SENSORS BC
Wing Gear Sensors
Figure 3

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