The Cessna 120-140 Association Forum

Morning all, I know it's been discussed before but I can't find it right now. I'm putting my 140 (9907) back together and am now rigging the ailerons and having a hard time getting the up and down limits on both wings, and the cable tension to all fall into place. Any hints or tips and does the 30 pound cable tension have a range associated with it? I am following the reference manual. Thanks for your thoughts and advice in advance.
Alexis

Most will agree the 30# setting can be banjo tight and that we would rather allow for smoother pulley operations.

The aileron bellcranks have a slot/pin arrangement that limits it's overall maximum travel. A neutral adjustment to the ailerons themselves is made with the shorter bent operating rods from the bellcrank to the aileron. I don't recall the correct alignment of those operating rods at the moment.

I recall some discussion on the bolt that attaches the operating rod to the aileron itself, see attached-

My ailerons droop maybe .5" at rest on both sides, and raise with pressure in flight. Can't seem to get that droop adjusted out on the ground without overly tightening up the cross cable. Works fine as is.

Thanks!

I recall initially setting the bellcrank angle so that the rear edge is 90deg to the mounting bracket edge (see image) before adjusting the push rod to give the aileron neutral position.

With this set, setting the control column to neutral by fixing them together with a section of wood and some cable ties... Once this is done then adjusting the tension to 20lbs. Seem to recall juggling the turnbuckles to get both the tension and the neutral position set.