Do I need a transponder on my aircraft?

Often, I am asked if a Rotax powered aircraft needs to have a transponder, in accordance with 14 CFR 91.215.

Some people think that the Rotax engine does not have an "engine driven electrical system" as defined in 14 CFR 91.215(b)(3).

If you "use" the lighting coil in your Rotax to power electrical equipment on your aircraft (starter, lights, radio, etc.), then yes, you are required to have a transponder, to fly in those areas where one is normally required.

Even if your aircraft did not have an electrical system when it received its airworthiness certificate, if you now have one, you are required to comply.

Here is a letter from the FAA, dated August 22, 2005, clarifying the transponder/electrical system definitions: View the letter here

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