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To: lml
Date: Mon, 29 Jan 2007 09:35:44 -0500
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From: "Janie & Ed Smith" <2luv2fly@cox.net>
Subject: Boost Pump Reminder
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"Anyway, is anyone having any luck with an altitude switch/light which acts 
as a reminder to turn the low boost pump on when climbing above 10,000 feet 
and turn it off when descending below 10,000 feet?"

Sunday Evening
1/28/07

Dan,

We are in the process of wiring our IV-P and the avionics shop, that I have 
had helping me do the wiring, designed a circuit using a Pressure Controls 
AV-1 altitude pressure switch as a signaling device.  The circuit turns on 
an annunciator light ("Boost Pump") whenever the aircraft climbs through 10K 
feet and when the boost pump is turned on, the light goes out.  When 
descending through 10K feet, the "boost pump" light will come back on and 
whenever the pump is turned off, the light goes out.  The circuit tests "as 
designed" on the bench, but has not been put into actual service yet - the 
only missing ingredient is the test on the pressure switch.

If you are interested in the details, just let me know.

Ed Smith
Chesapeake, VA