http://easa.europa.eu/essi/ehest/wp-..._EHEST_HE9.pdf
You will observe in para 2.4.3 that it advises pilots not to trim into the turn when using the basic AFCS systems. Later in a subsequent paragraph about 3 & 4-axis systems it doesn't provide any similar 'tips'. This leaves pilots with the impression that the 'do not trim into a turn' philosophy remains as the FD modes are built upon a basic AFCS system.
It certainly seems that there are many AW139 pilots who haven't got the message that trimming into the turn in normal stabilised flight is the preferred way to go. The French have even made trimming into a turn during a flight test a 'fail' point according to many of my French students.
We need the HE9 booklet to expressly say that trimming into the turn is the preferred way to go if the HDG mode is not being used directly.
G.