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mode C requirement and "engine driven electrical system"

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Dana

Super Moderator
Staff member
Joined
Apr 3, 2007
Messages
12,665
Location
CT, USA
We all know that Mode C (and soon, ADS out) is required in certain airspace, except:

...any aircraft which was not originally certificated with an engine-driven electrical system or which has not subsequently been certified with such a system installed, balloon or glider may conduct operations in the airspace...

So what does "subsequently certified" actually mean? Obviously, an aircraft that has an electrical system when the airworthiness certificate was first issued ("certificated") is not exempt, and you can't remove it later to become exempt, but what about an aircraft that has an engine driven alternator added later. Is it "certified" again? It would be if it's a standard aircraft (e.g. a no electric Piper Cub) and you install new engine with an alternator under an STC, but you don't need an STC to make a change to a homebuilt. Or is it "subsequently certified" when the A&P doing the condition inspection writes in the logbook, "I certify that this aircraft has been inspected..."?

Dana
 
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