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systems.
The DMA controller controls all data to and from the FCC and all
data between CPU 1 and CPU 2. It keeps the data in the DMA
RAM.
CPUs
Each FCC has two 16-bit CPUs. The two processors have
different part numbers to make sure that a design problem is
not in both processors. The CPUs calculate different
commands. This prevents a failure of both autopilot (A/P)
pitch and roll commands at the same time.
The CPU 1 calculates these commands:
* Flight director (F/D) pitch and roll commands
* Mach trim commands
* Stabilizer and speed trim commands
* Altitude alert commands
* A/P roll commands in cruise and approach
* A/P pitch commands in cruise
* A/P alternate pitch commands in approach
* Autoland (approach, flare, go-around) monitor
* Aileron limiter signals
* Engage/interlock high signal
* Mode and annunciator warning logic.
The CPU 2 calculates these commands:
* A/P pitch commands in approach
* A/P alternate roll commands in approach
* Stabilizer and speed trim warnings
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* Aileron limiter monitor
* Autoland monitor
* Engage/interlock low signal
* Software data loader.
When in the approach mode, the CPUs calculate the same roll
and pitch commands. The CPUs compare these commands
before they send them to the A/P actuators. When in autoland,
the two processors look at sensor data to make sure the control
surfaces move correctly. Also, both CPUs continue to look at
engage and interlock signals.
If the commands or signals do not agree, either CPU can
disengage the autopilot. This occurs because the MCP needs
the high and the low engage/interlock signal to engage the
autopilot and keep it engaged. The CPU 1 can remove the high
signal and the CPU 2 can remove the low signal.
Program Memory
Each CPU has its own memory to keep data and calculate
commands. The CPU 1 also has access to the nonvolatile
maintenance memory to keep BITE data as it occurs.
Power Supply
The power supply gets 28v dc and 115v ac. It changes the 28v dc
to 14v ac, 1800 Hz for control surfaces position sensors. It
changes the 28v dc to several other dc voltages for use within
the FCC. It also changes the 115v ac to 26v ac for the mach trim
actuator.
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Single Synchro Sensor
A single synchro sensor has one synchro and only one output.
The stabilizer position sensor B is the only single synchro
sensor. This sensor is not interchangeable with the dual
sensors.
Dual Synchro Sensors
A dual synchro sensor has two synchros with two outputs. The
dual synchro sensors measure the position of these control
surfaces:
* Aileron
* Elevator
* Elevator neutral shift
* Spoiler 4
* Spoiler 9
* Stabilizer (sensor A).
These sensors are the same and are interchangeable.
Aileron Position Sensor
The aileron position sensor measures the movement of the
aileron input torque tube. One output of the sensor goes to the
FCC A and the other goes to the FCC B.
Elevator Position Sensor
The elevator position sensor measures the movement of the
elevator lower input torque tube. One output of the sensor goes
to the FCC A and the other goes to the FCC B.
Elevator Neutral Shift Sensor
The horizontal stabilizer and the elevator operate together to
supply pitch control of the airplane. For each position of the
horizontal stabilizer, there is one position of the elevator that
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