Honda HondaJet HA-420 Pilots Operating Manual page 242

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
The CWS button can be used to disengage the pitch and roll servos from
the flight control surfaces and allows the crew to fly the airplane
manually without disengaging the autopilot. When the CWS button is
released appropriate flight director references are synchronized to the
current aircraft state.
An overspeed protection mode automatically activates when the speed
exceeds V +6 / M +0.01 if the flight director is engaged in a vertical
MO MO
mode other than ALT. The overspeed protection mode will command up
to 1.5g pull-up to minimize the speed excursion until the condition is
corrected.
Yaw Damper and Turn Coordination
A yaw damper system uses a yaw servo to input rudder commands to
reduce Dutch Roll oscillations and to provide turn coordination. The yaw
damper will automatically engage after takeoff or can be manually
selected on/off using the AFCS mode control panel. The yaw damper
automatically disengages at touchdown if engaged. When engaged a
green YD symbol is displayed in the FMA.
Rudder Bias
The rudder bias system continuously monitors and calculates the
difference in thrust levels of the engines. If the thrust difference exceeds
a pre-determined level, the Yaw servo is used to input a force
proportional to the thrust difference, to alleviate the required pedal force.
When active, the YD icon is replaced by a green RB symbol. When
differential thrust is reduced, RB will automatically disengage and YD
will become active, if YD was engaged prior to the RB engagement. If
the YD was not engaged prior to the RB engaged, YD will not auto-
engage. A disconnect of the RB is indicated by an amber flashing RB,
that self clears after 5 seconds.
HJ1-29000-005-001
October 30, 2016 1-226
FOR TRAINING PURPOSES ONLY