Whenever a nut is subject to rotation, it is required to have a drilled bolt, castellated nut, and cotter key. In the top photo you can see that the proper bolt/nut combination is correctly used on the forward rudder cable link attachment, but not on the aft one. Similarly, in the bottom photo the nut on the control column, which uses a brass insert as a bushing, requires a castellated nut. If a bolt is used through a rod end bearing, the use of a fiber locknut is approved, as the bushing in the rod end bearing rotates instead of the bolt.
In Case You Missed It
Electronic Ignitions
Tom Wilson - 0
As electronic ignitions become more popular, some homebuilders will want to consider making the switch (especially given the potential savings in fuel costs). Tom Wilson provides an overview of the marketplace and offers a “cost-benefit” analysis.
Letters: September 2019
Building and Selling
Two articles in the June edition really hit home for me: “How...
Around the Patch
Those who plan to build an aircraft from a kit would do well to visit the factory and get to know not only the owners but also the operation. So counsels Editor-in-Chief Marc Cook, whose recent visit to the RANS factory left him favorably impressed. RANS manufacturing is diversified to weather the ups and downs of the market, and the company knows what works and sticks to it.