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AP Disengage
Normally, the autopilot is disengaged by de-
pressing the arming button on either Control
Wheel Trim Switch (CWTS) and momentar-
i l y m ov i n g t h e b a r r e l i n a ny d i r e c t i o n .
However, the AP will disengage with any of
the following additional operator actions:
• Depressing the AP or the YD button on
the FGC.
• Depressing the go-around (GA) button
on the left thrust lever.
• Momentarily depressing the Control
Wheel Master Switch (MSW).
• Turning the trim selector switch off.
• Activating the secondary trim switch with
trim selection in SEC position.
• Activation of elev/roll disconnect.
• Power interruption to either IC-600.
• Autopilot monitor trip.
• AP disconnect (not YD) with stick shaker
activation.
• AHRS failure.
When the autopilot is disengaged by the op-
erator a disconnect tone, similar to the first few
notes of a cavalry charge, momentarily sounds.
Also, the green AP annunciators on the PFDs
turn amber and flash for 5 seconds, then blank.
Additionally, the green bar light next to the AP
select button extinguishes.
If an AP disconnect is due to autopilot mon-
itor trip, the disconnect tone will repeat until
acknowledged, and the “AP” will turn red.
Momentarily depressing (at least 2 seconds)
the MSW acknowledges the monitor discon-
nect and silences the disconnect tone. When
reset, the red AP will either disappear or turn
steady amber. An amber AP indicates that the
autopilot cannot be reengaged. Pulling and re-
setting the IC/SG #2 circuit breaker may clear
the fault.
YD Disengage
The YD can be disengaged by depressing the YD
select button on the FGC. There is no discon-
nect tone if only the YD is disengaged. When
the YD is disengaged by the operator, the green
YD on both PFDs will turn amber for 5 seconds
and then extinguish. If the AP is also engaged,
it too will disengage along with the YD. There
is no provision for having the AP engaged with-
out the YD. The AP and YD can both be si-
multaneously disengaged by momentarily
depressing either MSW.
A system initiated (monitor) disconnect of the
YD is annunciated with an amber “YD” on the
PFDs which will remain illuminated until a
MSW is depressed for at least 2 seconds.
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-83
FOR TRAINING PURPOSES ONLY
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