Diagnosing data input faults in a Dynon SkyView glass cockpit on a Piper Warrior requires a systematic approach, starting with an assessment of the affected input device and checking for error messages on the screen. The most common causes are faulty sensors, wiring and connection issues, or problems with the ADAHRS (Air Data, Attitude, and Heading Reference System) module. A methodical process of elimination, often beginning with a simple calibration check and visual inspection, can pinpoint the source of the problem.
Identifying the Faulty Input Device
The Dynon SkyView system receives data from numerous sensors and modules, and the first step in troubleshooting is to identify which specific input is at fault.
- Engine Data: Erratic or inaccurate readings for CHT, EGT, oil pressure, or fuel flow typically point to a problem with a specific sensor or the wiring harness connecting it to the SkyView system. The system can display error messages for individual sensors, such as “CHT Sensor Failed,” which will help narrow down the problem.
- Air Data: Faults in airspeed, altitude, or outside air temperature (OAT) are often related to the ADAHRS module. This unit is the primary sensor for all air data. A “red X” over an instrument on the screen is a classic symptom of an ADAHRS failure.
- Navigation and GPS Data: Incorrect position on the moving map or a “GPS Degraded” message can indicate a problem with the GPS receiver or its antenna. The SkyView system may also display a message indicating a loss of GPS signal.
- Control Input: A non-functional knob or button on the display unit itself suggests a physical failure of the component, a loose connection inside the bezel, or a software glitch.
Troubleshooting and Repair Procedures
Once the faulty input has been identified, a professional technician will follow a series of steps to diagnose and repair the problem.
- System Diagnostics: The Dynon SkyView system has a built-in diagnostics page that can be accessed through the menu. This page provides a wealth of information, including real-time sensor readings and error logs. A technician can use this tool to see if the system is receiving a signal from a particular sensor or if a module is communicating correctly.
- Visual and Electrical Inspection: A thorough visual inspection of the sensor, wiring harness, and all connectors is crucial. Vibration in a piston aircraft like the Piper Warrior can cause wires to fray or connectors to become loose. A technician will check for any signs of corrosion, damage, or a loose connection. They will use a multimeter to check for continuity in the wiring and ensure a stable ground connection.
- Sensor Calibration and Replacement: Many sensors, such as fuel senders and pressure transducers, require calibration. The technician will check the calibration settings in the SkyView system. If a sensor is deemed faulty, it will be replaced. This is particularly common with engine sensors that are exposed to high temperatures and vibrations.
- ADAHRS and LRU Checks: For problems with air data or attitude, the ADAHRS module is a key component to inspect. The technician will check its mounting to ensure it is secure and not subject to excessive vibration. If the module itself is faulty, it will likely need to be sent back to Dynon for repair or replacement.
The Aero Center Advantage
At The Aero Center, we specialize in the maintenance and repair of single-piston aircraft like the Piper Warrior. Our technicians are highly trained in diagnosing and repairing complex avionics issues. We have the authority and expertise to work with Dynon’s SkyView systems and can quickly and accurately pinpoint the cause of a data input fault. Our commitment to consistency and quality has built our reputation as a trusted provider of avionics maintenance in California, Arizona, and Nevada.
We are the only 24/7 maintenance center in the region, a unique offering that allows us to drastically reduce aircraft downtime. We understand that a data input fault can be a source of stress and keep your aircraft grounded. Our goal is to provide a fast, professional, and lasting solution so you can fly with confidence.
Footnotes:
- https://www.dynonavionics.com/docs/support.html
- https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/19_phak_ch17.pdf
- https://www.aopa.org/news-and-media/all-news/2021/october/pilot/dynon-support
- 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.