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Date: Fri, 22 Sep 2000 08:25:09 -0500
From: Brent Regan <brent@regandesigns.com>
To: Lancair List <lancair.list@olsusa.com>
Subject: Re: The 10,000+ Hour Vacuum Pump
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David Jones writes:

<<To continue to put pilots in the yuck without vacuum guidance is bordering
on
an atrocity>>

Dave, why don't you just paint a target on your back? If we take this
statement as true, how do you explain the vacuum of vacuum systems on cabin
class aircraft? Come to think of it, didn't I see a vacuum AH from a 747 on
e-bay? It was offered by the sam guy who was selling the cans of Black Steam
and the Water Hammers.

Vacuum systems are an artifact from the days before reliable electrical
devices and, like LP records, their time has passed.

The key to reliability is not installing components that won't fail. The key
to reliability is installing components in such a way so that WHEN they fail
they don't cause other parts of the system to fail as well. The elimination
of single point failure modes is the grail. Two alternators, two batteries
and two artificial horizons with provisions to cross connect the components
are an example of a system with a minimum of single point failure modes. If
one component has a mean time between failure of 600 hours then the
likelihood that two of the same components (e.g. two gyros) failing in the
same hour is roughly 1 in 120,000 hours of operation.

Why would you want a 10,000 hour vacuum pump anyway? Nothing else on the
plane lasts that long, including most pilots. I guess you could pass it from
one generation to the next. Here you go Johnny, your grandfathers vacuum
pump, you are now a pilot!

Just having a little fun;)

Regards
Brent Regan

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