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 -S404 RH Wing Gear.
 2)  The primary downlock sensors:
 -S399 LH Wing Gear
 -S401 LH Body Gear
 -S403 RH Body Gear
 -S405 RH Wing Gear.
 3)  The primary tilt sensors:
 -S416 RH Wing Gear Tilt
 -S417 LH Wing Gear Tilt
 -S418 RH Body Gear Tilt
 -S419 LH Body Gear Tilt.
 4)  The primary nose gear up sensor:
 -S396 Nose Gear Up.
 5)  The primary nose gear lock sensor:
 -S397 Nose Gear Lock.
 6)  The primary nose gear squat sensor:
 -S800 Nose Gear Squat.
 7)  The primary nose gear door sensor:
 -S406 RH Nose Door Warning.
 8)  The primary body gear door sensors:
 -S408 LH Body Door Warning
 -S409 RH Body Door Warning.
 9)  The Primary wing gear door sensors:
 -S407 LH Wing Door Warning
 -S410 RH Wing Door Warning.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 (b) The alternate landing gear subsystem has these sensors:
 1) The alternate uplock sensors:
 -S1636 LH Body Gear
 -S1637 RH Body Gear
 -S1638 LH Wing Gear
 -S1639 RH Wing Gear.
 2) The alternate downlock sensors:
 -S412 RH Wing Gear
 -S413 RH Body Gear
 -S414 LH Body Gear
 -S415 LH Wing Gear.
 3) The alternate tilt sensors:
 -S612 LH Body Gear Tilt
 -S613 RH Body Gear Tilt
 -S614 RH Wing Gear Tilt
 -S615 LH Wing Gear Tilt.
 4) The alternate nose gear up sensor:
 -S411 Nose Gear Up.
 5) The alternate nose gear lock sensor:
 -S424 Nose Gear Lock.
 6) The alternate nose gear squat sensor:
 -S801 Nose Gear Squat.
 7) The alternate nose door sensor:
 -S425 RH Nose Door Warning.
 8) The alternate body gear door sensors:
 -S427 RH Body Door Warning
 -S428 LH Body Door Warning.
 9) The alternate wing gear door sensors:
 -S395 L Wing Door Warning
 -S426 R Wing Door Warning.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (c)  The thrust reverser and auto restow subsystems have these sensors:
 1) The auto restow sensors:
 -
S1604 Eng No. 1 LH T/R Stowed

 -
S1604 Eng No. 2 LH T/R Stowed

 -
S1604 Eng No. 3 LH T/R Stowed

 -
S1604 Eng No. 4 LH T/R Stowed

 -
S1605 Eng No. 1 RH T/R Stowed

 -
S1605 Eng No. 2 RH T/R Stowed

 -
S1605 Eng No. 3 RH T/R Stowed

 -
S1605 Eng No. 4 RH T/R Stowed.

 2) The lock sensors:
 -
S1607 Eng No. 1 LH Actuator Lock

 -
S1607 Eng No. 2 LH Actuator Lock

 -
S1607 Eng No. 3 LH Actuator Lock

 -
S1607 Eng No. 4 LH Actuator Lock

 -
S1608 Eng No. 1 RH Actuator Lock

 -
S1608 Eng No. 2 RH Actuator Lock

 -
S1608 Eng No. 3 RH Actuator Lock

 -
S1608 Eng No. 4 RH Actuator Lock.

 3) The deploy sensors:
 -
S1609 Eng No. 1 LH Cowl Deployed

 -
S1609 Eng No. 2 LH Cowl Deployed

 -
S1609 Eng No. 3 LH Cowl Deployed

 -
S1609 Eng No. 4 LH Cowl Deployed

 -
S1610 Eng No. 1 RH Cowl Deployed

 -
S1610 Eng No. 2 RH Cowl Deployed

 -
S1610 Eng No. 3 RH Cowl Deployed

 -
S1610 Eng No. 4 RH Cowl Deployed.

 (2)  
The logic/driver operation mixes sensor logic signals and discrete switch inputs. This supplies discrete outputs for control systems and indication (Fig 3).

 (a)  
The discrete input signals are as follows:
　
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