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AP Engage Button Figure 04.10.3
Once engaged, the autopilot will couple to, and follow the guidance commands from, the selected flight director. If no FD modes are commanded prior to autopilot engagement, the autopilot automatically activates, and follows guidance from the basic lateral (ROLL) and vertical (PITCH) modes.
When the autopilot is not engaged, a left-or right-pointing arrow, in white, indicates which flight director the autopilot will couple to upon engagement.
Autopilot Engagement Criteria
The autopilot can be engaged provided the following conditions exist:
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At least one yaw damper is engaged (normally, both YDs are engaged);
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No faults detected in the active pair of flight control computers (FCCs); and
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No significant instability exists, including:
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Adverse pitch/roll/yaw rates;
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G-loads exceeding predetermined values; or
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Adverse pitch/roll attitudes exceeding predetermined values.
Autopilot Engagement
Figure 04.10.4
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.7
Oct 05/06
Autopilot Disengagement
Manual (Pilots Action) Disengagement
The autopilot is normally disengaged by pressing the red autopilot/stick pusher (AP/SP DISC) disconnect button on the outboard horn of either control wheel.
The autopilot may also be manually disengaged by any one of the following actions:
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Operating either stabilizer trim switch;
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Pushing the AP ENG button on the FCP;
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Selecting takeoff or go-around (TOGA) button;
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Switching the AFCS SEL selector to the other AFCS (1 or 2); or
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Pressing the yaw damper DISC switch.
Whenever the autopilot is manually disengaged (by pilot action), the PFD green engage annunciation turns red and flashes for 5 seconds, the green status indicator lights beside the AP button extinguish, and the autopilot disconnect (cavalry charge) aural sounds. The autopilot disconnect warning will automatically cancel after a few repetitions of the cavalry charge.
Monitored Disengagement
The FCCs continually monitor aircraft sensors, servo data, the automatic pitch trim system and internal parameters for faults. The autopilot will automatically disengage if any of the following conditions occur:
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Internal FCC monitors detect a failure in any axis;
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Any power source to an FCC of the active pair is lost;
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Loss of either inertial reference system (IRS) system input;
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Dual yaw damper failure;
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Aircraft is at an excessive attitude (pitch angle beyond +25° or .17°, roll angle beyond ±45°);
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Either stick shaker activates; or
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