I haven't flown the beast for almost 2 years now, but will try to answer some questions...
I was reading on the web that when you takeoff with the atr72 you select on the FCP panel HDG and V2+5, if you fly an SID can you arm the NAV mode and then the fd will swicth to NAV at a preset altitude - something like 400ft agl , or you have to manually select it?
LNAV is manually selected. Can be armed on the ground and becomes active somewhere during T/O roll, but officially should be selected above 400'
And the V2+5 IAS command is it armed or it is actually activated? If so does it provides with your pitch setting during normal ops or do you rotate through the command bars to let s say 15 degrees and then you sink the fd, while if you loose an engine you just rotate in the commanded pitch setting?
IAS V2+5 is active, not armed. However, IIRC, the technique is to rotate to ~8deg pitch and only after liftoff follow FD. That works both for 2 and 1 engine T/O
Then at the acceleration altitude you increase you speed to i guess 160 or 180 if you are in icing conditions and as you pass through the bugged vfto you raise the flaps and adjust the pitch to maintain your target airspeed.
At acceleration you set speed target on ADU - 170 or Red Bug+10, whicever is higher. Then you just follow FD and retract flaps after passing White Bug (in normal conditions), or Red Bug (in icing cond.)
Finally, the power management, do you takeoff with the power levers in auto and then you simply select TO on the PWR MNG or do you phisically advance tch the PLs to match the torque computed by the system?
On takeoff, PL's are advanced to the "notch" position, which gives max rated power for given rating. They normally stay there until Top od Descent and power changes are done via the PWR MGT selector.
AFAIK on the older '42 power had to be adjusted manually, but I have never flown the thing...
Any derated takeoff?
Normal takeoff is done with 90% of power. In case of engine failure, ATPCS bumps up the other engine to 100%
What about the prop? Which settings do you use?
Takeoff - 100% (1200rpm)
Climb - 86%
Cruise - 77% (86% in icing cond)
Approach - 86% (77% can also be used)
Go-Around - 100%
On the -500 with 6-bladed props
Takeoff, G/A - 100%
All other cases 82%
On the older versions props are adjusted manually, by moving the condition levers. For Go-Around the CL's are pushed forward by pneumatic actuators.
On PEC-equipped A/C, CL's stay in Auto detent all the time and prop rpm change automatically when moving the PWR MGT selector...
Never thought I'd say that, but I'm starting to miss the good 'ole ATR...
