Lane A / Lane B light issue on Rotax 915 IS

Experiencing intermittent activation of the Lane A / Lane B lights during flight is a situation that could stem from various potential causes. If you're searching for solutions, it's recommended to download the fault codes from your Engine Control Unit (ECU) to pinpoint the root of the issue.

To assist you in this process, we've provided a video guide detailing how to extract fault codes and logs from your ECU. You can find the video here: https://www.rotax-owner.com/en/videos-topmenu/free-videos/686. This resource will aid you in diagnosing and addressing the problem effectively.

Once you have successfully extracted your ECU data, you can provide it to your Local Rotax service center or repair station for evaluation. Their expertise will help in interpreting the data and determining the necessary steps to resolve the intermittent light activation issue.

If you do not have a BUDS connector or don't want to purchase one, you will need to take your aircraft to your local Rotax service center or repair station. They can extract the ECU data for you and analyze it to identify any underlying issues. This professional evaluation will assist in ensuring accurate diagnosis and effective resolution of the problem.

Here is a link to the Rotax Dealer locator: https://dealerlocator.flyrotax.com/

The issues I've  had like this on the 912iS was poor connections that vibration caused the issue. I had an issue similar to this on two 912iS engines. I removed the cable plugs off the ECU and checked for any arcing (none found) and then applied some dielectric grease over its face and re-installed them. While I was at it I did the same to the fusebox connectors. Both times this fixed the problem. Your issue may be different, but worth checking and ruling it in or out.