*
The flight crew overrides the autopilot command with the rudder pedal, control wheel, or control column.
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AFDS -FUNCTIONAL DESCRIPTION -ENGAGE INTERLOCKS BLOCK DIAGRAM
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AFDS -FUNCTIONAL DESCRIPTION -CRUISE ENGAGE INTERLOCK CONDITIONS
General
The conditions shown here apply to failures in the AFDS, PFCS, and sensor components which cause the autopilot to disengage in cruise. Other failures cause one or more of these:
*
Changes to the flight mode annunciator on the PFD
*
Mode fail
*
Caution/advisory messages.
Engage Inhibit
If the engage inhibit signal is true, the AFDCs cannot engage. If you try to engage the autopilot, the AFDS sends a disengage warning to WES and AIMS.
Engage Removal
If the engage removal signal is true, the AFDS does these three things:
*
Removes the engage requests to the PFCs
*
Disengages all backdrive actuators
*
Sends a disengage warning to WES and AIMS.
Conditions that cause an engage removal also cause AFDS status or warning messages.
When the AFDCs remove the engage requests to the PFCS, the PFCs:
* Accept and acknowledge the engage request removal
* Change from autopilot control to flight crew control of the pitch, roll and yaw (if engaged) axis.
Training Information Point
The purpose of this graphic is to supply a basic understanding of the cruise engage interlock conditions. The conditions shown on this graphic are a partial list of all the possible cruise engage interlock conditions.
Refer to the airplane system schematics for ATA chapter/ section 22-11 for a full list of all the cruise engage interlock conditions.
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AFDS -FUNCTIONAL DESCRIPTION -CRUISE ENGAGE INTERLOCK CONDITIONS
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AFDS -FUNCTIONAL DESCRIPTION -AUTOLAND ENGAGE INTERLOCK CONDITIONS
General
The conditions shown here apply to failures in the AFDS, PFCS, and sensor components which cause the autopilot to disengage during approach and autoland.
Engage Inhibit
If the engage inhibit signal is true, the AFDCs cannot engage. If you try to engage the autopilot, the AFDS sends a disengage warning to WES and AIMS.
Conditions that cause an engage inhibit signal also supply AFDS status and warning messages.
Engage Removal
If the engage removal signal is true, the AFDS does these three things:
*
Removes the engage requests to the PFCs
*
Disengages all backdrive actuators
*
Sends a disengage warning to WES and AIMS.
Conditions that cause an engage removal also cause AFDS status or warning messages.
Training Information Point
The purpose of this graphic is to supply a basic understanding of the autoland engage interlock conditions. The conditions shown on this graphic are a partial list of all the possible autoland engage interlock conditions. Refer to the airplane system schematics for ATA chapter/section 22-11 for a full list of all the autoland engage interlock conditions.
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AFDS -FUNCTIONAL DESCRIPTION -AUTOLAND ENGAGE INTERLOCK CONDITIONS
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AFDS -FUNCTIONAL DESCRIPTION -ENGAGE INTERLOCKS MASTER/SLAVE SELECTION
General
The AFDCs operate as master or slave when the autopilot engages in cruise. Two or three AFDCs must engage before the master/slave selection occurs.
Only the left or right AFDCs can be master because they operate the backdrive actuators. Any of the three AFDCs can operate as slave.
The master selection changes between the left and right AFDC to:
*
Apply equal wear between the backdrive actuators
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