thanks for all of you
Boeing 747-400, i think it's 3-axis A/P
In FS2004 a 747-400 developed by PMDG, before A/P applying runway alignment, A/P will conteract any input include rudder, but when start to decrab, rudder responsed my input, only rudder, but it's 3-axis A/P!
and by Boeing747-441 manual:
Runway Alignment and Asymmetric Thrust Compensation
AFDS controls the rudder during multiple A/P approaches to compensate for
crosswind landings and engine-out asymmetric thrust conditions. With LAND 2
or LAND 3 annunciated, A/P control of the rudder is active.
For crosswinds requiring more than 10 degrees of crab angle, runway alignment
occurs at 500 feet AGL. A sideslip of 5 degrees is established to reduce the crab
angle. This configuration is maintained until touchdown. The airplane lands with
the upwind wing low.
maybe something wrong with PMDG747
