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* V - volts
* Vmin - minimum safe airspeed
* Vmax - maximum safe design airspeed
* WTRIS - wheel to rudder interconnect system
* YDS - yaw damper system
YAW DAMPER SYSTEM - INTRODUCTION
EFFECTIVITY
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YAW DAMPER SYSTEM - INTRODUCTION
YAW DAMPER SYSTEM - INTRODUCTION
EFFECTIVITY
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YAW DAMPER SYSTEM - INTRODUCTION
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General
The yaw damper system is an autoflight system which moves
the rudder to decrease airplane yaw motion caused by dutch
roll or turbulence. The system operates for all phases of flight
and is normally engaged on the ground before takeoff.
These are the components for primary yaw damping:
* SMYD 1
* Yaw damper engage switch
* Yaw damper disengage light
* Yaw damper indicator
* Yaw damper components on the main rudder PCU.
Yaw Damper Engage Switch and Disengage Light
You engage the yaw damper system with a switch on the flight
control panel. For primary yaw damping, system B hydraulic
pressure is necessary and the FLT CTRL B switch must be ON.
The yaw damper disengage warning light is above the engage
switch. For normal yaw damper operation, the light is OFF. The
light is ON to show the yaw damper is not engaged while power
is on the airplane.
Yaw Damper Indicator
The yaw damper indicator shows rudder movement due to
SMYD 1 primary yaw damping commands. It does not show
rudder movement due to rudder pedal inputs. The indicator is
connected only to SMYD 1.
Main Rudder PCU
There are two rudder PCUs, a main and a standby, in the
vertical stabilizer. These PCUs are hydraulic actuators that
move the rudder in response to pilot rudder pedal inputs. The
main rudder PCU is used only during normal operations. The
standby rudder PCU is used only during standby operations.
The primary yaw damper uses the main rudder PCU to move
the rudder to reduce yaw. For yaw damping, these are the four
components on the main rudder PCU:
* Yaw damper solenoid valve
* Yaw damper electro-hydraulic servo valve (EHSV)
* Yaw damper LVDT
* Yaw damper actuator.
ADIRU
The air data inertial reference units (ADIRUs) send inertial and
air data to the SMYDs. The data includes airspeed, attitude, yaw
and roll rates, and accelerations. SMYD 1 uses this data for
detection of yaw motion to calculate a command to move the
rudder in the opposite direction to decrease unwanted yaw
motion of the airplane.
FMC
The FMC provides airplane gross weight to the SMYDs for use
in yaw damping calculations.
YDS - GENERAL DESCRIPTION
EFFECTIVITY
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Trailing Edge Flaps Up Limit Switch
The trailing edge flaps up limit switches send data to the SMYDs
to limit rudder travel for yaw damping when the flaps are up.
SMYD
The two SMYDs are the same. When a SMYD LRU is put in
position 1, it does the primary yaw damper function during
normal operations.
For primary yaw damping, both SMYDs must be operational
because SMYD 1 compares its yaw damping calculations with
SMYD 2 before it commands rudder movement.
For operation of the WTRIS and standby yaw damping systems,
see the wheel-to-rudder section. (SECTION 27-24)
YDS - GENERAL DESCRIPTION
EFFECTIVITY
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YDS - GENERAL DESCRIPTION
YDS - GENERAL DESCRIPTION
EFFECTIVITY
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Engage Switch and Disengage Light
The yaw damper engage switch and the disengage light are on
　
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