When is the roll limit reduced to half the normal value?

The roll limit being reduced to half the normal value occurs specifically in HALF BANK mode. This mode is designed to enhance passenger comfort and reduce the bank angle during turns, making it particularly beneficial for approaches and other phases of flight where excessive bank angles could lead to discomfort or heightened stress for passengers and crew. By limiting the roll to half of the standard value, the aircraft maintains operational safety while ensuring more stable and smooth maneuvers.

In contrast, TOGA mode prioritizes thrust and performance, which does not involve any specific reduction in roll limits; SPEED mode optimizes the aircraft’s speed management without limitations on roll; LO-LEVEL mode refers to a different mode entirely that does not correlate with roll restrictions. Thus, HALF BANK mode is the designated setting that directly addresses roll limit reduction, supporting smoother flight operations.