Isallobaric
that the electronics needed to perform HUM is quite straightforward. Certification is a different matter.....
You hit the nail right on the head. Monitoring systems are good, they improve safety, and if used properly they can give significant cost benefits (I won't bore you with how). BUT, certification is a key issue, and also all of the systems generate a certain amount of instrumentation errors, false alerts etc, in short, not good enough to support on condition maintenance just yet.
However people like my employers, Sikorsky, Smiths etc are striving to improve the systems. Maybe someday.
