Bill,

 

Lancair sells a high quality air pressure switch that will do nicely…adjustable and all, BUT it is expensive. Tell them you want the airspeed sensing switch used on the IV-P as part of the gear retraction lockout system.

 

I suspect there are cheaper alternatives available, but I’d check the reliability carefully…no point in installing a warning system that won’t be used often, and then have it not work when you really need it to…

 

Bob

 

 

I'm going to build the gear not down warning system suggested by Randy Stuart in an earlier email. I thought Aircraft Spruce had a airspeed sensing switch, but I couldn't find it in their catalog. Can any of you help me find a source for the pressure switch?

I've never had a close call with the gear in three plus thousand hours of retractable time, but I've always been a little uneasy with no warning system in my LNC2. I had hoped that I could talk Blue Mountain Avionics into building a warning system into their EFIS, but that didn't work out. Randy's system looks great to me and I'm eager to try it. I've attached Randy's drawing just in case others might want to revisit the idea.

Thanks -- Bill Kennedy