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to move to the zero position. The SMYD then compares its
commanded value with the value from the LVDT on the standby
rudder PCU.
Sweep Test
For the SWEEP TEST, SMYD 2 commands the standby rudder
PCU to move the rudder left, right, and then to the zero position.
During the test, left/right rudder movement is limited to 2
degrees with flaps up, or 2.5 degrees with flaps down. The
SMYD 2 servo command is compared to the LVDT value from
the standby rudder PCU to see if the rudder moved the
commanded value. During the test, rudder movement shows on
the SMYD BITE display in degrees of rudder movement and on
the yaw damper indicator in the flight deck.
If the test passes, the display shows TEST PASSED. Push the
MENU key to go to the previous sub-menu SERVO TEST. If the
test fails, the display shows TEST FAILED and then shows the
first fault. Push the down arrow key and the display will ask if
you want to see MORE DETAILS. Push YES to see more details
about the fault.
WTRIS - TRAINING INFORMATION POINT - SMYD BITE - SERVO TEST
EFFECTIVITY
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WTRIS - TRAINING INFORMATION POINT - SMYD BITE - SERVO TEST
WTRIS - TRAINING INFORMATION POINT - SMYD BITE - SERVO TEST
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-24-00-017
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.
WTRIS - SMYD 2 - SYSTEM SUMMARY
EFFECTIVITY
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WTRIS - SMYD 2 - SYSTEM SUMMARY
WTRIS - SMYD 2 - SYSTEM SUMMARY
EFFECTIVITY
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27-24-00-018
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27-31-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The elevators control the pitch attitude of the airplane about the
lateral axis.
Location
The elevators are on the trailing edge of the horizontal
stabilizer.
Pitch control
The pilots manually control the position of the elevators with
forward and aft movement of the control column.
When the autopilot engages, it automatically controls the
position of the elevators. During autopilot operation, inputs
from the autopilot actuators backdrive the control columns
through the elevator control system.
Abbreviations and Acronyms
* A/P - autopilot
* A/S - airspeed
* C/W - control wheel
* CWS - control wheel steering
* cntrl - control
GUN 001-099, 101-113, 115, 201-999
* EFSM - elevator feel shift module
GUN ALL
* FCC - flight control computer
* FDAU - flight data acquisition unit
* gnd - ground
* LE - leading edge
* MLG - main landing gear
* NLG - nose landing gear
* PCU - power control unit
* S/B - speedbrake
* sec - section
* SOV - shutoff valve
* stab - stabilizer
* SW - switch
* TE - trailing edge
* vlv - valve
* xfer - transfer
ELEVATOR AND TAB CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
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