Exactly my thought. Remember that the vacuum sucks air through the
instrument, check the inlet to see if the filter is on it. Could be just as
Ron described, insulation, dust and other crud could be getting sucked into
your gyros from behind the panel.
--
Jim Burns III

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"Ron Natalie" wrote in message
m...

"Jay Honeck" wrote in message
news:xdvnb.50697$HS4.232433@attbi_s01...

Doesn't it seem just a little weird to lose both vacuum instruments in a
six
week period? Is there any way my vacuum pump could still be putting out
5
inches of suction, and somehow sending junk into the instruments? Could
the
AI failure last month have influenced the DG failure this month?

Or is it just bad luck that they've failed together? Any opinions?

You do have a vacuum filter on the intakes to these things? When we lost
both
our gyros (other than finding one and a $5 price tag on the top of it), we
found
that the gyro inputs were just open to the crumbling insulation behind the
panel.