3 of 3: April 2004
The manual recommended procedure for aligning the trim tab drive pins did not appear to be convincing. Other builders had to remove the pins and rebond several times to get the alignment right. This task would be a lot easier if the drive pins are installed after assembling the tailplane (see next chapter). The T-bar (TS05) and the bushings (TS03) were installed and the drive pins were positioned such that both trim tabs were perfectly level with the elevator while the T-bar sits in the center slot of the torque tube. This exercise made it evident why so many builders had trouble with this part. Even if the drive pins were off by 1mm (which is hard to tell by visual alignment), one trim tab will end up being higher than the other.