3-10 3rd Ed. Sep 30, 06
S–TEC
Should the pitch servo loading exceed a preset threshold for a period of three
seconds, the autopilot will annunciate either Trim
∧
or Trim
∨
as a prompt to
trim the aircraft in the indicated direction. This is shown in Fig. 3-14. In addition,
an audible alert will sound a periodic tone. If no action is taken after four more
seconds, then the annunciation will flash and the audible alert will be squelched.
Once the aircraft has been sufficiently trimmed, such that the pitch servo loading
is below the preset threshold, the annunciation will extinguish.
Fig. 3-14. AP Display, Manual Trim Prompts
a. TRIM UP Required
b. TRIM DN Required
3.1.7.2 Automatic Elevator Trim
If the autopilot is equipped with autotrim, the Trim Master Switch is in the ON
position, and a pitch mode (ALT, VS, GS) is engaged, then the autopilot will
provide an annunciation whenever it is automatically trimming the aircraft
about the pitch axis.
Should the pitch servo loading exceed a preset threshold for a period of three
seconds, the autopilot will annunciate either Trim
∧
or Trim
∨
as an
advisement that it is automatically trimming the aircraft in the indicated direction.
This is shown in Fig. 3-15. In addition, the Elevator Trim Wheel will run either
nose up or nose down, respectively, with increasing speed. If the autopilot is
still in the process of automatically trimming the aircraft after four more
seconds, then the annunciation will flash. Once the aircraft has been sufficiently
trimmed, such that the pitch servo loading is below the preset threshold, the
annunciation will extinguish and the Elevator Trim Wheel will stop.
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