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actuator to the autopilot command.
The CPU command monitor compares the calculations made by
the primary CPU and the alternate CPU.
Any differences will disengage the autoland function and the
autopilots.
DFCS - FUNCTIONAL DESCRIPTION - A/P AUTOLAND
EFFECTIVITY
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DFCS - FUNCTIONAL DESCRIPTION - A/P AUTOLAND
DFCS - FUNCTIONAL DESCRIPTION - A/P AUTOLAND
EFFECTIVITY
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General
Engage and warning monitor circuits in the FCCs and MCP
monitor important autopilot (A/P) functions.
MCP
There are two autopilot engage switches on the MCP for each
autopilot system. These let the flight crew engage the autopilot.
You can engage the autopilot in the command (CMD) or control
wheel steering (CWS) mode. When you push one of the
autopilot engage switches, an engage relay energizes and the
autopilot engage switch light comes on if the engage enable
signals from the FCC are valid.
When the autopilot engages, the MCP sends a signal to these
components:
* Aileron A/P actuator
* Elevator A/P actuator
* FCC.
This signal energizes the actuator solenoid and tells the FCC
that it has energized the A/P actuators. The MCP also tells the
FCC which mode the crew selects.
The crew can disengage the autopilots with the captain’s or first
officer’s disengage switches or the autopilot engage switches.
There is also a disengage bar on the MCP that lets the flight
crew quickly disengage the autopilots. If the autopilot
disengages, the light on the autopilot engage switch goes out
and the A/P disengage warning shows on the ASAs. The
system aileron and elevator A/P actuators also de-energize.
FCC
The autopilot engage interlock circuits in the FCC monitor these
items and send an engage enable signal to the MCP:
* Operation
* Power
* Components.
To engage the autopilot, the pre-engage logic must be valid. To
keep the autopilot in the engage mode, the hold logic must be
valid. The autopilot engage logic table shows these logic
conditions.
CPU 1 sends a high engage enable signal to the MCP. CPU 2
sends a low engage enable signal to the MCP. The MCP needs
both signals to engage the autopilot.
DFCS - FUNCTIONAL DESCRIPTION - A/P ENGAGE INTERLOCK SCHEMATIC
EFFECTIVITY
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The FCC sends a signal to the A/P actuators to energize the
detent solenoids. This occurs after the actuators synchronize to
the control surface position. If the detent hydraulic pressure is
not present 3.5 seconds after the detent solenoids are
energized, the autopilot does not remain engaged.
During the cruise modes, you can only engage one autopilot, A
or B. If autopilot A is engaged and the crew chooses to engage
autopilot B, A will disengage after B has engaged.
When in the dual approach mode, you can engage both
autopilots at the same time. After you push the APP mode
selector switch on the MCP, you can push the second A/P CMD
engage switch. The second system autopilot actuators
synchronize to the control surfaces and engage the detent
pistons after the airplane is in the approach-on-course mode.
If the airplane is on a dual approach and the crew pushes a TO/
GA switch, both A/Ps stay engaged in the go-around mode.
The autopilot disengages if any of the general disengage
conditions shown on the autopilot engage logic table are
present. The roll and pitch mode disengage tables show the roll
and pitch conditions that will cause the autopilot to disengage.
A cross channel digital bus supplies engage and disengage
data between the FCCs.
Training Information Point
When the FCC is in BITE, you can engage the autopilot in CMD
or CWS.
DFCS - FUNCTIONAL DESCRIPTION - A/P ENGAGE INTERLOCK SCHEMATIC
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