The FAA is advising operators of the three 787 variants to notify crews about potential failure by the autopilot flight-director system to capture the localiser.
Several incidents have occurred involving 787s flying approaches to Hong Kong from the east. The system guidance partially reduced the intercept angle to the localiser, with the aircraft initially turning towards the localiser heading but then stopping short and flying a constant heading.
This resulted in the aircraft intercepting the runway axis at an angle of 20-30°, says the FAA in a 24 September bulletin.