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* WARN - warning
* WHL - wheel
* X-CH - cross channel
* XCHAN - cross channel
* xmtr - transmitter
* xfer - transfer
DIGITAL FLIGHT CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
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DIGITAL FLIGHT CONTROL SYSTEM - INTRODUCTION
DIGITAL FLIGHT CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
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DIGITAL FLIGHT CONTROL SYSTEM - INTRODUCTION
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Mode Control Panel
The mode control panel (MCP) is the primary interface between
the flight crew and the flight control computers (FCCs). The
crew uses the MCP to do these functions:
* Engage the autopilots
* Turn on the flight directors
* Select the mode of operation
* Select course and heading
* Select target speeds and altitude.
Other crew inputs to the FCCs are from these components:
* Autopilot (A/P) disengage switches
* Takeoff/Go-around (TO/GA) switches
* Control wheel steering (CWS) force transducers
* Autoflight status annunciators (ASAs).
FCC A and B
The FCCs use data from the MCP, sensors, and these systems
to calculate the autopilot and flight director commands:
* Radio navigation systems
* Air data inertial reference system (ADIRS)
* Flight management computer system (FMCS)
* Autothrottle (A/T) system
* Control surface position sensors
* Autopilot actuator position sensors.
The FCCs also use the data to calculate these commands and
alerts:
* Speed trim commands
* Mach trim commands
* Altitude alerts
* Autopilot disengage warnings.
Autopilot Commands
The autopilot can be in the command (CMD) or the control
wheel steering (CWS) mode. In the CMD mode, the FCC
calculates the commands which go to the autopilot actuators.
The actuators cause the inputs to the power control units (PCU)
to move which control the ailerons and elevator. In the CWS
mode, force transducers under the control columns sense
control wheel and control column forces from the pilots and
send these signals to the FCC. The FCC sends the commands to
the autopilot actuators to control the ailerons and elevator. The
FCC also sends commands to the stabilizer trim electric
actuator to trim the stabilizer.
The autopilot mode shows on the common display system
(CDS) above the attitude indicator. To disengage the autopilot,
the pilot pushes the disengage switches on the control wheel.
When the autopilot disengages, an aural warning is heard from
the aural warning module and the red A/P light on the autoflight
status annunciator (ASA) flashes. The ASA warning and aural
alert can be reset if the pilot pushes the red A/P annunciator on
the ASA or pushes the A/P disconnect switch.
DFCS - GENERAL DESCRIPTION
EFFECTIVITY
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Flight Director Commands
When the flight directors are on, the FCC calculates the
guidance commands that show on the CDS. There is no
movement of the control surfaces and no alert if the flight
directors are turned off. When you set the flight director mode
on the MCP, the mode and its status also show on the CDS
display.
Altitude Alert
The altitude alert function uses the altitude that is set on the
MCP. The FCCs tells the flight crew when the airplane
approaches or departs the set altitude. The autopilot or flight
directors do not have to be on for this alert to operate. There is
an aural indication from the remote electronic unit (REU) and a
visual indication on the CDS displays.
Speed Trim
The FCCs send speed trim signals to the stabilizer trim primary
electric actuator to control the horizontal stabilizer movements.
This control increases the airplane stability at low air speeds.
As the airplane speed slows, the stabilizer is moved to a more
nose down position to increase the speed. As the speed
increases, the stabilizer is moved to a more nose up position to
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