Bank angle parameters vary if on arr or dep, altitude limits,and max bank angle. The is a difference between bank angle and max bank angle, and that is per ac. There are bank limits to 8degrees below 400 ft as an example
Depending on the ac, the differences allow for course correction in the turn. As with the 737, bank angle is limited to 25degrees, leaving 5 degrees to max bank angle for course correction in the turn.
The 747 will still limit to 18 degrees, leaving the 25 select for course correction.
Course correction may be planned or unplanned, in the case of buffet protection, that is unplanned. ATC correction is currently considered planned
