oh yeah, i totally got lost. i was saying altitude because i and my friend were talking about the autopilot. in some helicopter the trim release will also reset any coupled flight director datums, to those occuring at the time of re-engaging the trim. For example, if i have altitude hold selected, if i press the trim release and fly the aircraft to a new altitude and then release, the new altitude will then be held. but some helicopters return to what the original settings were. thanks for the time! i got it