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WTRIS - GENERAL DESCRIPTION
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D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Flight Compartment
The yaw damper engage switch and the disengage light are on
the flight control panel.
Forward Nose Compartment
The control wheel position sensors are at the bottom of the
captain and first officer control columns, below the floor. Only
the captain sensor sends data to SMYD 2.
WTRIS - COMPONENT LOCATIONS
EFFECTIVITY
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WTRIS - COMPONENT LOCATIONS
WTRIS - COMPONENT LOCATIONS
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 27-24-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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WTRIS - COMPONENT LOCATIONS
WTRIS - COMPONENT LOCATIONS
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 27-24-00
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WTRIS - COMPONENT LOCATIONS
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D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Stall Management Yaw Damper
The SMYD 2 is on the E3-2 shelf in the electronic equipment
bay.
WTRIS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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WTRIS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS
WTRIS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS
EFFECTIVITY
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WTRIS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS
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D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Power
SMYD 2 gets 28v dc from DC bus 1 and 28v ac from transfer bus
1. 28v dc power goes from SMYD 2 to the yaw damper engage
switch.
The linear variable differential transformer (LVDT) on the
standby rudder PCU gets 28v ac from the same circuit as SMYD
2.
Digital Data
SMYD 2 receives airplane gross weight from the FMC.
SMYD 2 receives these air data from the right ADIRU:
* Airspeed
* Impact pressure.
SMYD 2 receives these inertial data from the left and right
ADIRUs:
* Lateral acceleration
* Roll angle
* Roll rate
* Yaw rate.
Analog Signals
SMYD 2 sends commands to the standby rudder PCU to assist
turns during flight control manual reversion, and for standby
yaw damping/turn coordination. The LVDT on the standby
rudder PCU sends rudder position data to SMYD 2 about rudder
movement.
The trailing edge flaps up limit switches send flaps up/not up
data to SMYD 2 to limit rudder movement when the flaps are up.
The left flap position transmitter sends flap position data to
SMYD 2 to use in stall warning, WTRIS and yaw damping
command calculation.
The right AOA sensor sends angle-of-airflow information to
SMYD 2 to use in stall warning, WTRIS and yaw damping
command calculation.
Power goes from the DC power and dim control to the yaw
damper disengage light.
The captain control wheel (CW) position sensor sends control
wheel aileron input information to SMYD 2 for the WTRIS
function.
WTRIS - INTERFACES
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-24-00-006
During standby hydraulic operations, when you turn ON the yaw
damper engage switch, an engage signal goes through SMYD 2
　
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