Diagnosing and fixing autopilot integration faults on Dynon glass cockpits

Diagnosing and fixing autopilot integration faults on Dynon glass cockpits often involves a methodical process of checking the ADAHRS module, the servo motors, and the system’s software configuration. The Dynon SkyView system’s integrated autopilot is a sophisticated network of hardware and software, and a fault in any one area can cause it to fail. The problem is rarely a single component failure; it is usually a communication or calibration issue that requires professional diagnosis.

Common Causes of Autopilot Integration Faults

  1. ADAHRS (Air Data, Attitude, and Heading Reference System) Module Issues: The ADAHRS module is the primary sensor for the autopilot, providing it with critical attitude and heading data. If this module is misaligned, subject to excessive vibration, or is failing, the autopilot will not be able to maintain a stable flight path and will often disconnect. Erratic behavior or a “red X” on the attitude indicator are common symptoms of an ADAHRS issue.
  2. Servo Motor Failures: The autopilot servos are the physical “muscles” of the system, connected to the aircraft’s control surfaces. A mechanical problem with a servo, such as a worn gear or a slipping clutch, can cause the autopilot to struggle to maintain a commanded attitude, leading to a disconnect. A professional can use diagnostic tools to check the servo’s performance and torque.
  3. Wiring and Connection Problems: A loose or corroded wire between the autopilot controller, the ADAHRS module, or the servo motors can cause an intermittent signal, leading to a disconnect. Vibration in a piston aircraft can cause these connections to loosen over time.
  4. Software and Calibration Issues: The autopilot’s performance is highly dependent on its calibration and software configuration. An incorrect calibration of the servo travel or a software glitch can cause the autopilot to behave erratically. A professional will often perform a system-wide recalibration and check the software versions to ensure they are current and compatible.

The Professional Repair Process

Diagnosing and repairing an autopilot integration fault should only be performed by a certified avionics technician.

  1. System Diagnostics: The technician will first access the Dynon SkyView system’s diagnostics page, which provides a wealth of information, including servo performance data, error logs, and ADAHRS health. This is often the first step in pinpointing the source of the problem.
  2. Physical Inspection: A thorough visual and electrical inspection of all autopilot components, including the ADAHRS, servos, and the wiring harnesses, is crucial. The technician will check for any signs of physical damage, corrosion, or loose connections.
  3. Recalibration: If no hardware fault is found, the technician will perform a full system recalibration. This involves a series of tests to teach the autopilot the aircraft’s control authority and servo travel limits.
  4. Component Repair or Replacement: If the troubleshooting process points to a specific component, such as a faulty ADAHRS module or a worn servo, the component will be repaired or replaced with an FAA-approved part.

The Aero Center’s Commitment to Quality

At The Aero Center, we are specialists in the maintenance and repair of single-engine and twin-piston aircraft, including those equipped with Dynon glass cockpits. Our technicians are factory-trained and have the specialized tools and expertise to handle these sensitive avionics systems. We have the authority and expertise to provide a reliable and long-lasting solution. We understand that a grounded aircraft is a major inconvenience, which is why we are the only 24/7 maintenance center in the California, Arizona, and Nevada region. Our commitment to consistency and quality ensures that every repair is performed to the highest standards, getting you back in the air safely and efficiently.

Footnotes:

  1. https://www.dynonavionics.com/docs/support.html
  2. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/19_phak_ch17.pdf
  3. https://www.aopa.org/news-and-media/all-news/2021/october/pilot/dynon-support
  4. https://www.lycoming.com/sites/default/files/SI1384B.pdf

The Aero Center is located at William J. Fox Airfield KWJF | Lancaster, CA. Contact us at 209.885.6950 for questions or appointments.

Scroll to Top