On Jan 31, 10:02*am, JJ Sinclair wrote:
On Jan 30, 6:58*pm, gs03jsa wrote:

Hi Folks -

Quick question - does anyone have experience with the LS-4 Trim Lock
coming loose with large control deflection?

I'm not quite sure what's causing the mechanism to slip - whether it
is a cable adjustment issue, weak spring issue, or whether the
brackets that lock the tube are just worn out of round.

Thanks for your help!

John Andrew
Atlanta, Georgia

I believe they are all that way, John. Trim is a fine adjustment not
meant to hold with full throw movements. After wild movements, re-set
the trim at the desired speed. You might look at the friction plate to
see if it needs to be repositioned a bit in order to give more holding
power.
JJ

Hi John,

Been a while since I worked on an LS4 (I used to own one), but IIRC,
the green trim lever on the left side of the cockpit sidewall was
mounted via a rubber bushing that provided the friction lock. There
was a machine screw that you could tighten (with the seatpan out) to
provide a little bit more friction.

As JJ mentions though, full/abrubt deflection of the controls will
tend to move the trim. And of course, you have to watch out that you
aren't accidentally squeezing the green trim lever on the control
stick which is easy to do either with your hand or with a boot that is
too narrow or stiff.

As I said, I'm trying to remember the trim mechanism mechanicals from
memory, as there is no diagram in the old copy of the maintenance
manual I have handy. There may be one in the repair manual...

P3