I’m actually ‘flying’ in a 787 FBS.
Here are some figures from the Sim Maintenance pages:
Weight 200 Tonnes (typical mid-cruise)
FL370 ISA (close to Optimum of FL366)
CG 25% MAC
LRC M0.853 / 279kts AoA 2.4 pitch att 2.4
Best Hold Speed 262kts AoA 3.2 pitch att 3.2
OEI drift-down speed 252 AoA 3.8 pitch att 3.0 (descending at 600fpm at an angle of -0.8)
So these figures would suggest that the wing incidence is zero, since for level flight the AoA and pitch attitude are the same.
Of course, this may only be a convenience adopted by the sim manufacturers and may not reflect the situation on the actual aircraft.
I-PIERLU: your 4 degrees is close to these figures.
Last edited by eckhard; 4th Feb 2018 at 16:51.