Does changing the Trim Step value on an existing model change the current trim position?

No. Changing the Trim Step does not effect any control surface until the trim button is next actioned. Then the number of steps per "click/beep" changes from the default setting (12 )whichallows rapid adjustment on a first flight. Reducing the number to say 6 provides for muchfiner tuning on subsequent flights. Increasing the the number to say 25 provides for coarse tuning or greater movements per click/beep.
For those new to adjustable trim steps,place model on a table and watch what happens as you try various settings. As the number rises above say 20, large movements become apparent with only say 4 steps between fully up and down when trim step is set to max..

Trim step has adjustable settings from 1-200 with 12 default (Approx.0.025deg ~ 5deg / Step).
The size of the trim step can be adjusted in the System — Trim Step function menu as attached.

Regards
Alan T.
Alan's Hobby, Model &amp; RC FAQ Web Links</p>

Thank you, AT!

<span style="font-size: smaller">Further to above and answeringquestion on another thread:
</span>
<span style="font-size: x-small">Sub trims are only used whilst model is being set up -
should never re-adjust sub trims at a later time without a re-set of that model program and start over.
</span>
<span style="font-size: smaller">(ex manual page 77)
</span>&bull; There are two screens to the EPA menu. Note the 1/2 Icon.
&bull; The EPA range is O% to 140%.
&bull; Sub-Trim and Dual Rate functions can Impact the programmed EPA values.

<span style="font-size: x-small"><font color="#22229c">Aurora 9 - Programming Chart</font></span><span style="font-size: x-small"> and attached extracts from Aurora manual may assist.
</span>
<span style="font-size: smaller">Whilst written at time of Futaba FF7, 8UAP, Eclipse, Optic 6 etc., believe following is still relevant:
</span><span style="font-size: x-small"><font color="#22229c">EPA &amp; ATV - Dual Rates differences &amp; Cautions </font>

</span>Service Bulletin <span style="font-size: smaller">TX-20100520 Aurora 9 Transmitter - Using EPA and D/R Functions Create Dead Zone in Stick Travel
We have confirmed customer reports of a software bug involving the End Point Adjustment and Dual Rate functions.
When both functions are at their highest settings, there is a significant dead zone at the stick endpoints.
Until this issue is resolved in a future software update, it is advisable for customers to keep either
the D/R or EPA setting at 125% or less and the other at 120% or less.


</span>Alan T.
<font color="#22229c">Alan's Hobby, Model &amp; RC FAQ Web Links</font></p>

AT, Thanks again. This is a really important piece of info for a compulsive button pusher.