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I like Randy's 5 criteria for problem solving and
have a slight variation to his washing machine switches. We've used an
adjustable pressure switch from Omega Industries
(Omega.com) successfully for a gear safety switch and it could also
be used to activate an aural and/or visual warning if the gear is up and the
airspeed gets too low by wiring it in series through the gear switch. It's
part #PSW21A and is less than $40. It comes with normally open and
normally closed contacts and could function as both "squat switch" and
gear-not-down warning trigger. That would require the gear warning to be
approximately the same speed as the gear safety feature which some might
consider too low. If so, using a second switch would solve that
problem. I usually adjust the switch to trip at about 4" H2O which is
about 80 knots. That might be lower than desired for a gear warning.
Your call. The only downside I see is that it would be cool to be able to
tell people I have washing machine parts in my plane.
Leighton Mangels
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