David Lesher
shared these priceless pearls of wisdom:

-
-A somewhat dumb question. Each vacuum-driven instrument has its
-own input filter, correct? The hoses and pumps are then all downsteam
-of the instrument.

Sometimes. More often there is one very large filter with two outlets (or a
single outlet with an installer's T fitting) for both vacuum gyros.


-
-Does garbage really migrate upstream into the expensive toys? (And
-if so, you'd thunk someone would add a inline filter between the
-toy and the common vacuum line..)

Not really. The carbon dust that comes off of a normally operating pump gets
ported overboard and the big chunks that come off of a pump in failure mode get
thrashed about until they are small enough to be blown overboard OR remain in
the pump as mute testimony to the advantages of a wet pump.


-
-Education welcomed.

And is generally expensive, but not as expensive as ignorance (Twain).


Jim
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com