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Abbreviations and Acronyms
* AC - alternating current
* ADR - air data reference
* ADIRU - air data inertial reference unit
* AOA - angle of airflow
* ARINC - Aeronautical Radio Incorporated
* ATR - Austin Trumbull Radio
* BITE - built-in test equipment
* CAA - Civil Aviation Authority
* CDS - common display system
* CPU - central processing unit
* DC - direct current
* DEU - display electronic unit
* DFCS - digital flight control system
* EHSV - electrohydraulic servo valve
* FAA - Federal Aviation Administration
* FMC - flight management computer
* IR - inertial reference
* I/O - input/output
* LRU - line replaceable unit
* LVDT - linear variable differential transformer
* MCP - mode control panel (DFCS)
* N1 - engine low pressure rotor (fan) speed
* N2 - engine high pressure rotor speed
* NN - a number from 01 to 99
* PCU - power control unit
* SMYD - stall management yaw damper
* V - volts
* WTRIS - wheel to rudder interconnect system
* YDS - yaw damper system
WHEEL TO RUDDER INTERCONNECT SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 27-24-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-24-00-001
WHEEL TO RUDDER INTERCONNECT SYSTEM - INTRODUCTION
WHEEL TO RUDDER INTERCONNECT SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 27-24-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-24-00-001
General
The wheel-to-rudder interconnect system (WTRIS) moves the
rudder to help turns during flight control manual reversion
when on standby hydraulics. For the WTRIS function, SMYD 2
has interfaces with these components:
* Control wheel position sensor (captain)
* Yaw damper engage switch
* Yaw damper disengage light
* Flight control panel switches
* Standby yaw damper solenoid valve
* Standby EHSV
* Standby LVDT
* FMC
* Trailing edge flaps up limit switches
* Left flap position transmitter.
Stall Management Yaw Damper
SMYD 2 commands rudder movement for WTRIS and standby
yaw damping and turn coordination during flight control manual
reversion when on standby hydraulics. SMYD 2 receives data
from airplane sensors, switches and components, and uses the
data to calculate and send commands to the standby rudder
PCU to move the rudder.
Control Wheel Position Sensor
The captain control wheel (CW) position sensor senses pilot
aileron input and sends an analog signal to the SMYD 2 to
calculate a command for left/right rudder movement for WTRIS.
Yaw Damper Engage Switch and Disengage Light
You engage WTRIS and standby yaw damping with the yaw
damper switch on the flight control panel. The disengage
warning light is above the switch.
Standby Rudder PCU
The standby rudder PCU is a hydraulic actuator that moves the
rudder in response to pilot rudder inputs when on standby
hydraulic pressure. During standby operation, SMYD 2 sends
commands to the yaw damper components on the standby
rudder PCU.
ADIRU
The air data inertial reference units (ADIRUs) send data to the
SMYDs. The data includes airspeed, attitude, and yaw and roll
rates and accelerations.
FMC
The FMC provides airplane gross weight to the SMYDs.
Trailing Edge Flaps Up Limit Switches
The trailing edge flaps up limit switches send data to the SMYD
to limit rudder travel when flaps are up.
Left Flap Position Transmitter
The left flap position transmitter sends data to SMYD 2.
WTRIS - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-24-00
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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
27-24-00-002
WTRIS - GENERAL DESCRIPTION
WTRIS - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 27-24-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-24-00-002
WTRIS - GENERAL DESCRIPTIION
WTRIS - GENERAL DESCRIPTION
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 27-24-00
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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