If you are 15° off heading, what angle of bank would you use to correct back to the course?

To adjust for a heading that is 15° off course, the appropriate bank angle relates directly to the degree of heading change required. When a pilot needs to correct their heading, they typically use a bank angle that corresponds to the angle of the correction; this is due to the concept of coordinated turns and the relationship between bank angle and turn rate.

When correcting for a deviation from the desired flight path, it is generally accepted that a bank angle equal to the angle off course can be a good starting point for a correction. Therefore, using a bank angle of 15° is suitable when correcting for a heading that is also 15° off, allowing the aircraft to regain the correct course efficiently without excess lateral acceleration that could lead to loss of control or a prolonged path to correction.

Using a bank angle larger than 15° in this case might lead to overshooting the intended path or increased load factors that may be unnecessary for such a minor correction. Hence, a bank angle of 15° effectively and efficiently realigns the aircraft back to the desired heading with minimal risk of overcorrection.