I own a Sierra. It has a microswitch mounted on the fuel servo housing. The switch is operated by the throttle lever, and turns on the warning horn if the throttle is retarded while the gear are still up. Is there any info or source for this switch, besides Beech? They are often out of stock, and it looks like a standard-hardware electrical part.
Editor:
The 1SE1 (no dash number) microswitch, and JE5 actuator arm, are used on the throttle arm at the fuel injection servo. RAPID lists the switch three ways, for different applications. It shows up as a 1SE1 ($74), a 1SE1-3 ($77), and a 1SE1-6 ($98). The suffix digit indicates that there are attached or molded-on wires of either three feet or six feet. The 1SE1 switch comes without wires attached; it has small solder lugs on it. The actuator arm (lever) that works with the 1SE1 style switch is a JE5, listed in RAPID for $10. Amazingly enough, as I write this the 1SE1 and JE5 lever are actually in stock at RAPID.
The 1SE1-1 is available from Gopher Electronics (http://www.gopherelectronics.com/ProdDetail.asp?_x=1SE1&_y=MIC) with a 1-foot pigtail for $35.70. Many, if not most, of these switches originate in Honeywell.