S-tec 55x Installation — Manual

Once the installation is complete, the system must be tested and calibrated to ensure proper operation. To do this:

Systems are configured for either 14 VDC or 28 VDC.

The of the aircraft (e.g., Cessna 172, Piper PA-28)

+--------------------------------------+ | S-TEC 55X Programmer/Computer | +-------------------+------------------+ | +-------------------------+-------------------------+ | | v v +------------------+ +--------------------+ | Roll Axis Loop | | Pitch Axis Loop | +--------+---------+ +--------+-----------+ | | |--> Turn Coordinator Input |--> Static Pressure Transducer |--> HSI/DG Heading Error |--> Internal Accelerometer |--> Roll Servo Output |--> Pitch / Trim Servo Output 2. Main Module Component Specifications S-tec 55x Installation Manual

Adjusting internal potentiometers on the turn coordinator to ensure zero drift during straight-and-level flight.

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

Verify the faceplate LEDs display the proper initialization sequence. Once the installation is complete, the system must

This guide serves as a comprehensive overview of the requirements. It covers pre-installation planning, hardware mounting, wiring, and post-installation ground and flight testing. 1. Pre-Installation Planning and Certification

Calculate the exact weight of the removed instruments (e.g., standard turn coordinator) and the added weight/arms of the S-TEC components to update the aircraft's equipment list.

: Includes a pressure transducer for altitude hold functions. Avionics Interfacing (GPS/Nav/Heading)

Use only the specific S-TEC STC-approved brackets designed for the target airframe.

Ground the system to the main aircraft bus ground block. Poor grounding introduces electrical noise into the rate gyro signal, causing the autopilot to "hunt" or wander in flight. Avionics Interfacing (GPS/Nav/Heading)