in the newer series of ATR's>>>>>>>>>the 500's series
take power is controlled automatically by the EEC (electronicEngineControl)
taking into acc. OAT, through the ADC (airdatacomputer), & other input data
previous model's like the 300'& 320's , dont have this, they have ECU
power for take off had to setted manually ( no notch detent )
this components (of many more that are part of eng. control)
will send all info & data to the computer's
& this will give you the actual power setting
in the 500's is auto, you'll go to a NOTCH detent
and eng power for takeoff will set up automatically
always to 90% of torque not more, its fixed
& of course, the higher the OAT & Altitude, the lower the take off rating
but its always atomatic, you just need to pre-check it before takeoff
and confirm it on roll, tahts it
going back to the begining , what it doesnt have
is an ON demmand derrated T/O powersetting
regardless of bleed's ON or OFF
hope it help's, im not a book worm,
so maybe i missed a few items on the systems, but in general its like that
very simple the logic