What is "recertified"

Usage examples of "recertified".

I did some lecturing here and there, then took a few engineering courses to familiarize m’self with this century’s technology, got recertified and, poof, here I am.

Afterwards the bridges would have to be repaired, surveyed and recertified, but that was far less expensive than the cost of replacement.

After each shuttle flight the orbiter has to be stripped down, reassembled, and recertified from component level up.