lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> Tracy, I have about $5 in my gear up warning system, and it seems to do the job very nicely. The landing gear switch in the gear well for the gear down light is a single pole double throw switch. The unused pole is hot (12v) when the gear is up. I slipped on a terminal and ran the wire to a micro switch under the flap lever arm (connected to the motor). The micro switch has one of those long levers on it and it is positioned (and adjustable) so that when the flap goes down (10-15 degrees) the contact is closed. the voltage then goes to a large, red, flashing LED on on the instrument panel near the gear down switch. Thus, if one lowers the flaps in anticipation of landing, and the gear is up, that big red light flashes right in your face. You could hook it into audio or other alarms, but the light surely gets my attention. I did a short article on it with part numbers, etc. for the Lancair Network News, but I don't have the reference here at home. I recently put in a new fuel probe and removed the wing to do it. It is a 2-3 hour job plus safety wiring for both operations. Let's see if I can remember the steps.... 1) disconnect strobes, nav lights and aileron trim wires. 2) disconnect fuel line. 3) disconnect aileron push rod at dry bay. 4) remove flap 5) remove aft spar brace 6) remove two big spar bolts. The safety wire on the spar bolts is a nasty job. I remember the first one took 2+ hours to feel my way through the process. It got better after that, but not by much. Some fellows are using the conical Bellview washers to put considerable back pressure on the threads. Who knows about the security of that? Bob Chesley LNC2 - N4YH Oxnard, CA LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com.