190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-10
2.1.1.15 Autopilot
The GFC 500X is an advanced digital flight director and autopilot, based around the GSA 28 smart
autopilot servo. Servo installation kits are available for numerous popular aircraft, and universal
installation brackets are available for other aircraft. Up to five GSA 28 servos are supported (pitch, roll,
yaw damper, pitch trim, and roll trim). GSA 28 servos can optionally control aircraft electric trim motors;
this keeps the aircraft in trim when the autopilot is engaged, and also provides trim motor speed control
and stuck-switch protection when hand-flying. The GSA 28 can also be used as the trim actuator in the
pitch and roll axes. The GSA 28 servos also support enhanced stability and protection features (ESP™
corrective technology) which increase safety when hand-flying. For GSA 28 installation information, refer
to Section 16
and Section 24. For GFC 500X autopilot and ESP setup and adjustment information, refer to
Appendix H
or Section 30. Refer to the G3X Pilot’s Guide or G3X Touch Pilot’s Guide for information on
GFC 500X autopilot and flight director operation.
The GMC mode control panels are a family of optional accessories that provide a convenient set of
dedicated controls for the GFC 500X autopilot and flight director. A GFC 500X autopilot installation with
a GMC mode control panel also has increased redundancy, allowing control of basic autopilot modes using
the GMC even when power is removed from all GDU displays.
The GMC 307 supports all the features of the GMC 305, and adds dedicated control knobs for heading and
altitude. Autopilot operation in a reversionary condition without operational GDU displays is provided by
an RS-232 connection from the GMC 305/307 to the GSA 28 roll servo. For GMC 305/307 installation
information, refer to sections Section 10
and Section 11.
The GMC 507 is physically similar to the GMC 307, but it connects to the G3X system through the shared
CAN bus. Up to two GMC 507 Mode Control panels can be installed. The GMC 507 adds an additional
flight director mode button. For GMC 507 installation information, refer to section Section 12
.
In a G3X Touch system with GDU 4XX displays and one or more ADAHRS units, all autopilot and flight
director functions can be controlled either from the GDU display or the optional GMC control panel. Refer
to the G3X Touch Pilot’s Guide (190-01754-00) for more information.
In a G3X Touch system with no ADAHRS units, one or more G5 displays and a GMC control panel are
required for autopilot and flight director operation using the G5. Refer to the G5 Pilot's Guide
(190-02072-00) for more information.
In a legacy G3X system with GDU 37X displays, a GMC control panel is required to enable certain
advanced flight director modes; refer to the G3X Pilot’s Guide (190-01115-00) for more information.
Certain third-party autopilots that are designed to be integrated with the G3X system may also be used in
conjunction with the G3X flight director and GMC control panel. Consult the third-party autopilot
manufacturer for further information.
Third-party digital autopilots that are not integrated with the G3X system are typically connected either
through a GDU display RS-232 output that provides NMEA 0183 format data, or through various
connections to a GTN/GNS navigator. Consult the autopilot manufacturer for further information.
The GAD 29B can provide analog heading and course error outputs to non-Garmin analog autopilots.
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