The S-Tec System 55X incorporates the GPS Roll Steering and tracking with glide slope capture and track, VOR/localizer/back course intercept and tracking, and vertical speed commands. The System 55X Computer/Programmer has an LCD digital display and is designed for mounting in the standard avionics stack. Options include heading pre-select, auto-trim, altitude pre-select, remote annunciator and flight director. Panel unit: 6.25"W x 1.5"H x 8.5"D.
- Lighted 3” Turn Coordinator
- Avionics Stack Mounted
- Control Wheel Steering
- HDG Preselect & Hold (HDG SYSTEM NOT INCLUDED)
- Altitude Hold with Altitude Trim
- Course Intercept Capability
- NAV Mode
- Dual Mode - HDG/NAV or HDG/APR
- VOR/LOC/GS/REV/GPS Coupling with 3 Gain Levels
- VOR/LOC/GS/REV/GPS Course Deviation and NAV Flag Warning
- Digital Vertical Speed Command
- Pitch Trim Annunciation
- GPSS Mode
- Flight Director Compatible
The Model 55X is a pure rate-based two-axis autopilot offering you smooth precise, dependable performance. Combining the programmer, computer, annunciator, and servo amplifier functions into one compact panel mount unit, the System 55X is the first S-Tec autopilot system designed specifically to be integrated into the aircraft radio panel with other avionics. It is also the first S-Tec system to feature control wheel steering.
The System 55X roll axis has heading select, VOR/Localizer front and back course intercept and tracking. It can be interfaced with RNAV, GPS, or Loran systems. The System 55X Flight Guidance Programmer/Computer converts pilot commands to logic signals for roll and pitch computer functions. Altitude Hold with Altitude Trim.
System 55X 
04-13-25