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makes the two operate together as one control surface. This is
the neutral shift position. The elevator neutral shift sensor
supplies an electrical signal that is in proportion to the elevator
neutral reference position. The elevator neutral shift sensor
measures the movement of the elevator feel and centering unit.
One output of the sensor goes to the FCC A and the other output
goes to the FCC B.
Spoiler Position Sensors
The spoiler position sensors measure the movement of spoilers
4 and 9. One output of the sensor goes to the FCC A and the
other goes to the FCC B.
Stabilizer Position Sensor A
The stabilizer position sensor A measures the position of the
horizontal stabilizer. One output of the sensor goes to the FCC A
and the other goes to the flight data acquisition unit (FDAU).
DFCS - CONTROL SURFACE POSITION SENSORS
EFFECTIVITY
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Stabilizer Position Sensor B
The stabilizer position sensor B measures the position of the
horizontal stabilizer. The output of the sensor goes to the FCC
B.
Physical Description
The dual synchro sensor is a cylindrical unit. It is 5.3 inches long
and 1.6 inches in diameter. The sensor weighs 0.75 pounds.
The single synchro sensor is a cylindrical unit. It is 4.4 inches
long and 1.3 inches in diameter. This sensor weighs 0.4 pounds.
The two sensors turn +/- 140 degrees. There are index marks
on the case and the input shaft of the sensor. These marks help
align the sensor.
Functional Description
The two-wire input to the sychros comes from the FCCs. It is 14v
ac at a frequency of 1800 Hz. The three-wire output can change
from 0v ac to 6.36v ac as the input shaft turns from 0 degrees to
+140 degrees. It can change from 0v ac to 6.36v ac with a
phase change of 180 degrees as the input shaft turns from 0
degrees to -140 degrees.
Training Information Point
Examine the alignment reference marks when you install a
position sensor.
The DFCS BITE current status test finds a failure of the sensors.
You use the DFCS BITE rigging tests to do a check of the sensor
adjustment. You also use DFCS BITE analog sensors test to see
the sensor output.
DFCS - CONTROL SURFACE POSITION SENSORS
EFFECTIVITY
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Page 94
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-033
DFCS - CONTROL SURFACE POSITION SENSORS
DFCS - CONTROL SURFACE POSITION SENSORS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-033
General
The purpose of the control wheel steering (CWS) force
transducer is to supply electrical signals which vary in
proportion to the force on the transducer. These are the CWS
force transducers on the airplane:
* Captain pitch CWS force transducer
* First officer pitch CWS force transducer
* Roll CWS force transducer.
The pitch transducers measure the force on the control column.
The roll transducer measures the force on the control wheel.
Physical Description
The force transducer is a cylindrical unit. It is 5 inches long and
2.25 inches in diameter.
Functional Description
The force transducer has two sensors. Each sensor is a linear
variable differential transformer (LVDT). One output goes to the
FCC A and the other goes to the FCC B.
The transducer has a spring assembly with two coils and two
armatures. A bearing assembly is at each end of the
transducer. You use the bearing assembly to install the unit.
The transducers are adjustable. There are stops to prevent the
spring assembly from being extended too far.
The input to the force transducer is 26v ac at 400 Hz. The output
changes from 0v ac to 6.2v ac as the force changes from 0
pounds to +119 pounds. It can change from 0v ac to 6.2v ac with
a phase change of 180 degrees as the input force changes from
0 to -119 pounds.
Training Information Point
The DFCS BITE status test can find a failure of the force
transducer. You use the DFCS BITE rigging test to do a check of
the transducer adjustment. You also use the DFCS BITE analog
sensors test to see the transducer output.
DFCS - CONTROL WHEEL STEERING FORCE TRANSDUCER
EFFECTIVITY
　
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