It depends, I suspect, on the age of the design. My -7 drawings were not searchable, the -12 drawings are (which is incredibly handy). I imagine that different software was used to create and export the drawings.Great deal, for sure, but you're probably going to need OCR software to process the images in order to do searches. The ones I've seen are just scans; not true searchable .pdf's.
I was just on the site and didn't see that. I'll look again. Thanks