Originally Posted by
The Juice
If the CTOT is set to 90% and the PL are pushed to 92% when you activate CTOT it will not lower to 90% so how can you get an increase in torque when you dial down the CTOT?
If done correctly, you cannot.
Here is what sometimes happens:
Say you are going to set 92% on the CTOT control panel. The PF advances the power levers to say 85% instead of somewhere in the 77-82%. The CTOT switch is moved to APR and you see 92% on the guages. Perfect, well, about 100 knots or so or even during acceleration after climb, the torque has actually bloomed to 95% (based on where the power levers are set). Some pilots do not notice this during the takeoff roll or initial climb so when they do dial down the CTOT, they are left with the 95%.
Ideally, and you will get there with practice, when you dial down the CTOT after takeoff, you will not have to move the power levers and the Torque will remain constant.