Shawn, 212 man,
I have put in a request to SAGEM and going on past experience should have a reply within 6 months.
212,
I have dredged the SDS and it is very vague about the A/TRIM function. It is referred to variously between Attitude Trim and Automatic Trim depending on which document you are reading. No mention of the change in mode with speed as quoted by 212 man although it is there. I think it is a case of "who knew?"
As there is nothing in the published documentation that is required to operate and maintain the thing, how would you?
There is no Chapter 22 in the EC135 ECMM. There is an SDS description in the AMM but is very vague and I can't find anything about it.
The RFM Supplement 9.2-48 OPERATION 4.2.2 Takeoff and Climbout
NOTE: If unsymmetrical stick forces occur during hover, press FTR switch briefly.
This is the way I have been operating it for ~250 hours.
Might drop a line to my maulwürfe in ECD.