Airwolf wet pump

We’re not sure if it’s a good thing or not, but the dry vacuum pump—arguably the most exasperating component aircraft owners have to tolerate—has been on the hot seat lately. A high-profile crash in which a failed pump was hinted (the Governor Mel Carnahan crash four years ago) has stoked owner nervousness about instrument back-up systems and in parallel, several improvements in dry pump technology have found their way to market.

Now comes the Airwolf Filter Corp. with bold plans to end run around the dry pump’s foibles entirely by reviving what used to be the standard source of instrument vacuum: the engine-driven wet pump. There are still plenty of these…