Vans Aircraft RV-12 Build, Section 16: Stall Warning (Part 1)

Reference: page 16-02; 2 hours

It's time to start a new section on the RV-12 airplane kit by Van's Aircraft. This section deals with installing the Stall Warning vane/switch in the wing. Also I will discuss the "fun with washers" on the Stall Warning Assembly.

Step 1: Final-drill #30 the holes in the VA-195A Mount Plate and VA-195B Keeper Plate that are used to mount the ES E22-50K Micro Switch. Machine countersink both holes of the mount plates inboard side for the flush head of the #4 screw.



Step 2: Final-Drill #19 the hole in the VA-195A Mount Plate and VA-195B Keeper Plate that holds the #8 screw on which the VA-196 Stall Warning Vane pivots. Machine countersink this hole in the mount plate on the inboard side for the flush head of a #8 screw.



Step3: Deburr all holes and edges.



Step 4: Assemble the Stall Warning Subassembly. Do not over-torque the nut on the screw about which the VA-196 Stall Warning Vane pivots. Insure that the stall warning vane can rotate freely.

Builders note: Fun With Washers. There are three different NAS washers called out on page 16-02, however the washers supplied use the older AN- number. Because of this, crossreferencing can be interesting. So here are the equivalents: NAS1149FN416P = AN960-4L; NAS1149FN432P = AN960-4; NAS1149FN832P = AN960-8.





Step 5: Take the W-1205-L and W-1205-R Terminal Brackets and remove the bending tabs. Deburr all holes and edges.



Step 6: Clamp the PS UHMW .125X2X2 1/4 to the W-1205B/F-1270C Guide UHMW Drill Template, match-drill #40 all holes, clecoes may be added to keep part from turning. Final drill to create the W-1205B Terminal block. Repeat for the second terminal block. Save the drill template for use during Section 31.



Step 7: Place the W-1205B Terminal Block on the outboard side of the W-1205-L Terminal Bracket and rivet. Repeat process for W-1205-R Terminal bracket.