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to the yaw damper solenoid valve on the standby rudder PCU to
engage the yaw damper. SMYD 2 commands rudder movement
using the standby EHSV. The flight control panel switches for
system A and B must be in the OFF or STBY RUD position to
enable SMYD 2 for WTRIS and standby yaw damping.
WTRIS - INTERFACES
EFFECTIVITY
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WTRIS - INTERFACES
WTRIS - INTERFACES
EFFECTIVITY
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Purpose
SMYD 2 calculates and sends commands to the yaw damper
components on the standby rudder PCU to move the rudder for
WTRIS and standby yaw damping/turn coordination. SMYD 2
uses control wheel (aileron) position data to command small
amounts of rudder movement to help turns during flight control
manual reversion, when on standby hydraulics. SMYD 2 uses
inertial data from the ADIRU to detect unwanted yaw motion due
to dutch roll or turbulence.
SMYD 2 also does stall management functions.
Physical Description
The SMYD weighs approximately 10 lbs. It uses 10 watts of
power. A standard Boeing BITE module is on the front of the
LRU and interfaces with the SMYD to monitor operation and
record faults. The BITE module has these features on the front
of the unit:
* Bite instructions on the label
* Display
* Keypad.
Bite Instructions
Bite instructions on the BITE module tell how to test the unit and
move through the BITE software.
Display
The SMYD BITE module has a two-line amber display. Each line
has eight alphanumeric characters. The display shows
messages about the type of fault, maintenance message
number, and fault details when you do BITE. The SMYD 2
BITE interfaces with and provides fault data for stall
management functions and for standby yaw damping and
WTRIS.
Keypad
You use the keys on the BITE module to operate the SMYD
BITE. The keypad has these keys:
* ON/OFF
* MENU
* YES
* NO
* Up arrow (previous)
* Down arrow (next).
See the SMYD section for more information about BITE
operation. (SECTION 27-32)
WTRIS - STALL MANAGEMENT YAW DAMPER
EFFECTIVITY
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WTRIS - STALL MANAGEMENT YAW DAMPER
WTRIS - STALL MANAGEMENT YAW DAMPER
EFFECTIVITY
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27-24-00-009
General
SMYD 2 uses analog and digital data inputs to calculate rudder
commands for WTRIS and standby yaw damping/turn
coordination.
Engage Interlock
SMYD 2 supplies 28v dc to the yaw damper solenoid valve on
the standby rudder PCU. When this solenoid valve is energized
it supplies hydraulic fluid to the EHSV to operate the yaw
damper actuator on the standby rudder PCU to move the rudder
for WTRIS and standby yaw damping.
WTRIS
The WTRIS function of SMYD 2 uses control wheel aileron
inputs from the captain control wheel position sensor to
command small amounts of rudder movement. This helps
turn the airplane during flight control manual reversion when
operating on standby hydraulics.
The SMYD central processing unit (CPU) operates the control
law software. For SMYD 2, the software calculations are based
on inputs from these components:
* Captain control wheel position sensor
* ADIRUs (inertial and air data)
* Right AOA sensor
* FMC
* Standby rudder PCU LVDT
* Trailing edge flap up limit switches.
SMYD 2 receives inertial data from the ADIRU to calculate
commands for standby yaw damping and turn coordination.
These commands go to the yaw damper EHSV on the standby
rudder PCU to move the rudder.
The EHSV applies hydraulic pressure to the yaw damper
actuator and the actuator makes a mechanical summing input
to the rudder PCU to move the rudder to assist turns and to
reduce unwanted yaw. The standby LVDT sends yaw damper
actuator position data about rudder movement to SMYD 2.
WTRIS only operates at Mach < 0.4. The gain schedule
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