Check that the servo output arm has complete freedom of movement throughout the entire control surface travel range. Cable and Bridle Tensioning
The 55X is typically mounted in the aircraft's radio stack and integrates with various flight instruments to control both roll and pitch axes. NTSB (.gov) Programmer/Computer
Before any physical work begins on the aircraft, the installing technician must verify the Supplemental Type Certificate (STC) availability for the specific aircraft make and model. S-TEC autopilots are certificated under a approved model list (AML) STC framework. S-tec 55x Installation Manual
Reverse polarity on trim servo or incorrect trim sensor wiring
: These include the main Programmer/Computer (typically P/N 01192-X), Turn Coordinator, and optional items like an ST-360 Altitude Selector/Alerter or remote annunciator panel. Remote-Mounted Hardware Check that the servo output arm has complete
Calibrated to ensure a smooth transition into altitude hold without pitching up or down aggressively. Servo Trim and Null Adjustments
, SI-22-01) is typically restricted to authorized dealers and required to be provided with an aircraft-specific Supplemental Type Certificate (STC) BeechTalk.com While a full, free public download from the manufacturer ( Genesys Aerosystems S-TEC autopilots are certificated under a approved model
Installed in the wing or cabin floor to control the ailerons.
Verify pinout configuration against the STC schematic; swap motor leads if reversed. Alt Hold fails to maintain altitude Static line leak or defective pressure transducer
: Provides troubleshooting, functional ground tests, and system interconnect drawings for rate-based autopilots, including the 55X. S-TEC 55X Maintenance Manual
Run shielded twisted-pair wire (MIL-W-22759 or equivalent) for all signal paths, including gyro lines and servo tachometer lines.