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logic is correct, the A/P engages and the switch light
comes on when you push the switch. If the pre-engage logic is
not correct, the A/P will not engage and the switch light will not
come on when you push the switch.
After you engage the A/P, some conditions must stay correct or
the autopilot disengages. If the A/P disengages, the switch light
goes off.
A/P Disengage Bar
You disengage the A/P when you push the A/P disengage bar
down.
Mode Selector Switches
These are the mode selector switches:
* Autothrottle N1
* Autothrottle speed
* Level change
* Heading select
* Approach
* VNAV
* LNAV
* VOR LOC
* Altitude hold
* Vertical speed.
If a mode selector switch light is on, you can turn off that mode
when you push the switch again.
Light Sensors
Two photo diode light sensors on the MCP front panel monitor
the light in the crew compartment area. The sensors control the
brightness of the LCDs.
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Purpose
The purpose of the flight control computer (FCC) is to get data
inputs and calculate these functions:
* Autopilot commands
* Flight director commands
* Altitude alerts
* Speed trim commands
* Mach trim commands.
The input data is from the pilot through the MCP and sensor
inputs. The FCC also sends signals to control surface actuators
and shows displays on the common display system (CDS).
Loadable Software
The software in the FCC is loadable. The software can be
loaded using the data loader and the data loader control panel.
The software can be loaded after these conditions are met:
* Successful long term power-up
* Valid data signals
* Airplane is on the ground
* Groundspeed is less than 60 knots
* No wheel spin
* No autopilot is engaged.
NOTE: Do not interrupt power to the system during software
loading. If power is interrupted, you will need to do the
software load procedure again.
Physical Description
The FCC is 6 MCU in size. Any connector on the back is for
interface signals and test connectors with covers are on the
front. The two FCCs are the same and interchangeable line
replaceable units (LRU).
CAUTION: DO NOT TOUCH THE FCC BEFORE YOU DO THE
PROCEDURE FOR DEVICES THAT ARE SENSITIVE
T O E L E C T R O S T A T I C D I S C H A R G E .
ELECTROSTATIC DISCHARGE CAN CAUSE
DAMAGE TO THE FCC.
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General
The flight control computer (FCC) is a digital computer. It takes
inputs from many systems to calculate the flight control signals.
The FCC contains these components:
* Direct memory access (DMA) system
* Computer processing units (CPUs) 1 and 2
* Program memory
* Power supply.
DMA System
The DMA system has these components:
* DMA I/O devices
* DMA controller
* DMA RAM.
The FCC can receive and send these types of data:
* Digital
* Analog
* Discrete.
The DMA I/O devices receive ARINC 429 data or convert analog
and discrete signals to ARINC 429 data. This data then goes to
the DMA controller. The DMA I/O devices also convert ARINC
429 data to analog and discrete signals before it goes to other
　
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