GFC 600 AFCS Part 23 AML STC Maintenance Manual Page 56
190-01938-00 Revision 13
9.4 Normal Mode Tests
The tests in the following sections are performed with the system in normal mode.
NOTE: For certain models there may be additional and/or different checks that must be
completed instead of or in addition to those listed in the following sections. Refer to the Master
Drawing List 005-01009-01 to determine the part number of any additional checkout
procedures.
NOTE: Throughout the following sections:
1. A normal autopilot disconnect will be accompanied by a normal disconnect aural alert
(two high-low tones approximately two seconds in duration) through the cockpit
speaker(s) and headphones and a continuous tone from the sonalert for approximately
10 seconds (if installed).
2. An abnormal disconnect will be accompanied by an abnormal disconnect aural alert
(continuous high-low tones) through the cockpit speaker(s) and headphones and a
continuous tone from the sonalert (if installed). The abnormal disconnect tones can be
cancelled by pressing the AP button on the GMC 605 or the AP DISC/TRIM INT switch
on the pilot’s flight controls.
3. GFC 600 AFCS mode and status annunciations are displayed on the PFD only if the
PFD is a Garmin GDU.
4. If the aircraft does not have a GI 285 AFCS mode annunciator, disregard any steps
calling on the GI 285.
5. If the aircraft is not equipped with a flight director, disregard any steps for flight director
command bars.
6. If the aircraft is not equipped with a pitch trim servo, disregard the steps for pitch trim
servos.
7. If the aircraft is not equipped with a yaw damper servo, disregard the steps for yaw
damper servos.
8. Depending on the aircraft and the control system, the pitch trim and/or yaw trim may run
automatically at any time while the autopilot is engaged. If it gets to the end of its travel,
an amber TRIM annunciation may appear. If this is causing undesirable results, press
and hold the CWS switch while manually operating the aircraft trim wheel in the opposite
direction. Release the CWS switch when the trim wheel is no longer on its stop.
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