Manually specifying an FPA to the FAF inhibits the Transition to Approach (TTA) function.
The system can use descending Flight Path Angle (FPA) constraints associated with flight plan waypoints to calculate a descent path in the vertical profile. The system calculated Flight Path Angle (FPA) will be displayed in flight plan. The crew may optionally define a specific Flight Path Angle (FPA) constraint for a waypoint in the flight plan.
183: Entering a Flight Plan Waypoint FPA Constraint
