Engage HDG mode, turn the heading bug right, and verify the control yoke turns smoothly to the right without catching or reversing. 6. Flight Testing and Calibration
Align the servo capstan precisely with the aircraft control cables as specified in the drawings. Misalignment causes premature cable wear and friction.
Terminate shields at the aircraft instrument panel ground bus only. Leave the servo end of the shield floating (unterminated) to prevent ground loop noise. Avionics Interfacing S-tec 55x Installation Manual
While full manuals are restricted, technical excerpts and wiring diagrams for specific models (like the Piper Seneca V) or maintenance manual excerpts can sometimes be found via third-party repositories. Installation Scope and Key Technicalities
This is the most critical step and must be performed by a qualified test pilot or technician. Engage HDG mode, turn the heading bug right,
Verify that the mechanical stops on the servo are adjusted so they never limit the primary flight control travel. The aircraft's control stops must be reached before the servo hits its internal limits. Electrical Wiring and Avionics Integration
An installation manual for the S-TEC 55X autopilot is a highly technical, FAA-regulated document essential for certified avionics technicians. Because autopilot installation constitutes a major alteration to an aircraft, it requires strict adherence to the manufacturer's Supplemental Type Certificate (STC) data, wiring diagrams, and structural blueprints. Misalignment causes premature cable wear and friction
Re-enter diagnostic mode and adjust roll null voltage voltages. ARINC 429 wiring swap or wrong GPS config
Manufacturers typically require that their products be installed according to their guidelines to honor warranties and provide support.
for service bulletins that supersede the manual. For example, Service Bulletin SB-55x-014 changes the rate gyro warm-up time from 3 to 5 minutes.
A complete S-TEC 55X installation typically consists of the following core components:
