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* Left and right flap position transmitters
* Stabilizer position sensors A and B
* Neutral shift sensor
* Elevator position sensor.
A/P Elevator Actuators
The A/P elevator actuators send the elevator actuator position
data to its onside FCC. This position data comes from the linear
variable differential transformer (LVDT).
MCP
When you engage the A autopilot to CMD or CWS, the MCP
sends an engage signal to A/P elevator actuator A. This lets A
hydraulic fluid into the actuator. The MCP also sends this signal
to FCC A. The FCC then commands the actuator main piston to
synchronize to the elevator position. When you engage the B
autopilot to CMD or CWS, the MCP sends an engage signal to
A/P elevator actuator B. This lets B hydraulic fluid into the
actuator. The MCP also sends this signal to FCC B. The FCC
then commands the actuator main piston to synchronize to the
elevator position.
Captain Pitch CWS Force Transducer
The captain pitch CWS force transducer sends a signal to the
FCCs. This signal is in proportion to the force on the captain
control column.
Flap Position Transmitters
The left flap position transmitter sends the left flap position data
to FCC A. The right flap position transmitter sends the right flap
position data to FCC B.
Elevator Position Sensor
The elevator position sensor measures the position of the
elevators. It sends a signal in proportion to this position to both
FCCs.
First Officer Pitch CWS Force Transducer
The first officer pitch CWS force transducer sends a signal to
both FCCs. This signal is in proportion to the force on the first
officer control column.
Stabilizer Position Sensors
The stabilizer position sensors measure the position of the
stabilizer. Stabilizer position sensor A sends a position signal to
FCC A and to the flight data acquisition unit (FDAU). Stabilizer
position sensor B sends a position signal to FCC B.
DFCS - PITCH SENSOR ANALOG INTERFACE
EFFECTIVITY
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Neutral Shift Sensor
The neutral shift sensor measures the relative position between
the stabilizer and the elevator. It sends this signal to both FCCs.
FCC
The FCC A sends a signal to A/P elevator actuator A to engage
the detent piston. This pressurizes the main piston and locks it
to the output shaft. It also sends the pitch command signals to
this actuator. The FCC B sends a signal to A/P elevator actuator
B to engage the detent piston. This pressurizes the main piston
and locks it to the output shaft. It also sends the pitch command
signals to this actuator.
Each FCC sends its onside elevator position data to the other
FCC.
DFCS - PITCH SENSOR ANALOG INTERFACE
EFFECTIVITY
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DFCS - PITCH SENSOR ANALOG INTERFACE
DFCS - PITCH SENSOR ANALOG INTERFACE
EFFECTIVITY
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General
The speed and stabilizer trim functions of the FCC have an
interface with these components:
* Stab trim warning light
* Column switching module A/P cruise trim and stab trim
cutout switches
* Flight control panel
* Stab nose up and down limit switches
* Left elevator tab solenoid valve
* Stabilizer trim electric actuator.
FCC
The FCCs send stabilizer trim actuator clutch and nose up and
down trim signals to the column switching module. The FCCs
also send a flap down signal to the stabilizer trim electric
actuator. This signal controls the speed of the stabilizer trim
electric actuator. When the flaps are down, the speed is three
times the speed when the flaps are up.
Stab Trim Warning Light
If either FCC calculates that the stabilizer is out of trim, it sends
a stabilizer out of trim warning signal to the stab trim warning
light to turn it on.
　
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