Installation manual

System Overview 1-7
MODE TRANSITION INDICATION
Automatic transition from armed (cyan) to engaged (green) states
is indicated by the cyan armed button on the autopilot control
panel and mode annunciation on the PFD changing to green and
flashing for up to 10 seconds.
Note that the engaged (green) autopilot mode annunciators will
also flash when in underspeed or overspeed conditions. This
flashing is intended to gain the pilot’s attention and to indicate
that while the modes are still engaged (green), the underspeed or
overspeed condition may be affecting the system’s ability to hold
the target value. As soon as the underspeed or overspeed
condition is no longer true, the annunciators stop flashing and the
system reacquires the target values as required.
MANUAL ELECTRIC TRIM IMPACT
Any attempt to engage manual electric trim (MET) via the cockpit
controls will result in the autopilot disconnecting and then the trim
running as commanded by the MET control.
NOTE
Trim Behavior in DFC90-equipped Aircraft
For some aircraft (e.g. Cirrus), if the airplane is
equipped with a pitch servo, actuating the trim
switch will disconnect the AP. For some aircraft
(e.g. Cirrus) that are equipped only with pitch trim,
actuating the trim switch will have no effect during
autopilot operations (trim will not adjust and the AP
will not disengage). For predictability of results,
pilots of DFC90-equipped aircraft should therefore
determine whether the aircraft is equipped with a
pitch servo or pitch trim and the resulting behavior
before actuating the trim switch in IMC conditions.
Change 3