User Guide

Garmin G1000 AFCS Pilot’s Guide for Beechcraft A36/G36
190-00609-00 Rev. B
9-2
INTRODUCTION
GSA 81 AFCS Servos (4)
Four GSA 81 servos are used for automatic control of
the aircraft flight control surfaces. One servo is used for
the each of the following:
• Pitch
• Roll
• Pitch Trim
• Yaw
Each servo moves its respective aircraft control surface
in response to commands generated by internal servo cal
-
culations. For pitch trim, the servo positions the aircraft
pitch trim surface in response to commands generated
by automatic and manual electric pitch trim calculations.
Calculations are performed using data sent through the
common serial data bus from the GIA 63. Manual electric
pitch trim is also provided in response to the Manual Elec-
tric Trim (
MET) switch.
GSM 85 Servo Mounts (4)
The GSM 85 servo mounts are used to connect the
servos to the aircraft control system. They contain a spi-
ral capstan which connects via a bridle cable to the main
aircraft control cables. There is also a slip clutch to limit
overpower forces in the unlikely event of a mechanical
jam. An engage clutch is used to disconnect the capstan
from the servo when the AFCS is disengaged.
Dedicated AFCS Controls
Refer to Figure 2.3.1 located in the System Overview.
The GDU 1043 MFD has the following dedicated AFCS
keys located on the lower left side of the bezel:
• AP Key
– Engages/disengages the Autopilot
• FD Key – Activates/deactivates the Flight Director
only
Pressing the
FD key turns on the Flight Direc-
tor in the default vertical and lateral modes.
Pressing the
FD key again deactivates the
Flight Director and removes the command
bars, unless the Autopilot is engaged. If the
Autopilot is engaged, the FD key is disabled.
• NAV Key
– Selects/deselects the Navigation mode
• ALT Key
– Selects/deselects the Altitude Hold
mode
• VS Key – Selects/deselects the Vertical Speed
mode
• FLC Key
– Selects/deselects the Flight Level
Change mode
• YD Key
– Engages/disengages the Yaw Damper
• HDG Key
– Selects/deselects the Heading Select
mode
• APR Key – Selects/deselects the Approach mode
• NOSE UP/NOSE DN Keys – Controls the active
pitch reference for the Pitch Hold, Vertical Speed,
and Flight Level Change modes