Erklärung: Hello Marcus,
The term for this is actually two words and in aviation/aeronautics it can apply to a part or a system on an aircraft.
Hope this helps
Catherine
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Just for you to know, I specialize in aviation and I am a pilot...
Erklärung: The document at the first link, a report from the European Organisation for Air Safety, translated "ruggedised" to "avionable" in the French resume.
All the other instances I've found refer to equipment primarily intended for use in aircraft which implies they're heavy-duty (because of the inherent vibrations of aircraft in flight).
However, for your instance, I'd go with "airworthy" for the simple reason that what's important for your case is not that the part in question is ruggedised but rather that the part be fit for use in an aircraft.
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The translation workplace 
