190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 3-8
4. Force Trim Servo Engagement
* Pitch and roll axes failures result in FCS failure annunciation and will not be shown as
single axes failure. Yaw is the only single axis failure that doesn’t result in HFCS failure.
5. Flight Director Engagement
Not Engaged
(Not present)
Servo Active
(Attitude Hold or
Coupled FD)
Out of Detent
Out of Detent
(> 10 sec)
(
flashing
)
Servo Transition
(active to off)
(
flashing
)
Single Axis Failure*
FCS Unavailable
Decoupled, FCS not
engaged
(Not present)
Level Mode
(will display as Active Lat and
Vert modes)
Coupled Flight Director
Decoupled Flight
Director
(
flashing coupled to decoupled;
first 5 seconds
)
Decoupled, FCS
Engaged
(will display as Active Lat and/
or Vert mode, depending on if
a single or no axis is engaged
in higher-level mode.)
Decoupled,
Groundspeed Hold
Mode
(will display as Active Lat and/
or Vert mode with valid GPS
and groundspeed below the
hover transition threshold.)