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Yaw damping, turn coordination, and WTRIS are part of the yaw
damper function of the SMYD. SMYD 1 does primary yaw
damping/turn coordination during normal operations. SMYD 2
does WTRIS and standby yaw damping/turn coordination during
standby operations.
SMYD Input Data
These are the components and sensors that send data to the
SMYDs. Some of these components also receive data from the
SMYDs:
* DFCS mode control panel (MCP)
* Air data inertial reference unit (ADIRU)
* Flight management computer system (FMCS)
* Common display system (CDS) DEUs
* LVDTs on the rudder power control units (PCU)
* Angle of airflow (AOA) sensors
* Takeoff/go-around (TO/GA) switches
* Stall warning test panel
* Flight control panel
* Flap slat electronics unit (FSEU)
* Proximity switch electronics unit (PSEU)
* Trailing edge flap up switches
* Flap position transmitters
* Control wheel position sensor (Capt’s side only)
* Opposite SMYD.
SMYD Output Data
These are the systems that receive data from the SMYD:
* Flight control computers (FCC)
* Autothrottle computer (A/T)
* Ground proximity warning computer (GPWC)
* Common display system (CDS) DEUs
* Cabin pressure controllers (CPC)
* Flight data acquisition unit (FDAU)
* Flight control panel
* Flap slat electronics unit (FSEU)
* Proximity switch electronics unit (PSEU)
* Elevator Feel Shift Module (EFSM).
ADIRU
The ADIRUs send air data and inertial data to the SMYD to use
for stall management and yaw damping functions. These are
discussed under SMYD - Digital Interfaces.
SWS - SMYD - GENERAL DESCRIPTION
EFFECTIVITY
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DFCS MCP
The MCP sends autopilot engage status to the SMYD.
FMC
The FMC sends gross weight to the SMYD to use to calculate
airplane performance data such as Vmin, Vmax, and the PLI,
and for stall management, yaw damping, and WTRIS. The FMC
also provides buffet margin speeds and landing flap information
to the SMYD.
DEU
The SMYD calculates this airplane performance data and sends
the data to the DEUs to show on the CDS:
* Vmin and Vmax speeds (red/black barber poles and amber
band speed ranges) for airspeed indicators
* PLI symbol (amber) for display on ADI.
The DEUs send this data to the SMYD on ARINC high speed
buses:
* Engine N1 and N2 RPM
* Radio altitude
* Wing and engine anti-ice switches.
Rudder PCU LVDT
The rudder PCU LVDT sends analog data to the SMYD about
commanded rudder movement for yaw damping or WTRIS, for
feedback in the SMYD servo loop.
AOA Sensor
The AOA sensor sends analog angle of airflow vane data to the
on-side SMYD. This data is used to determine airplane pitch
attitude to set the stall warnings and to calculate performance
data.
TO/GA Switches
The TO/GA switches send DFCS and A/T engage status to the
SMYD during takeoff when on the ground, or during go-around
when in the air.
Stall Warning Test Panel
The stall warning panel test switches send analog discretes to
their on-side SMYD to start a test of the control column shaker
motors.
SWS - SMYD - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-502
Flight Control Panel
The flight control panel sends analog switch position signals to
the SMYD for the yaw damper engage switch and the flight
control switches. When these switches are engaged on the
flight control panel, the SMYD monitors yaw damper or WTRIS
operation. If there are no faults, the SMYD sends a signal to this
panel to turn off the yaw damper engage light and provides
engage power to hold the yaw damper engage switch in the ON
position.
FSEU
The FSEU sends analog discrete data to the SMYD for leading
edge device asymmetry and uncommanded motion. This data
enables the SMYD to bias the stall warnings so that the
warnings occur earlier if there is asymmetry or uncommanded
motion of these devices.
The SMYD sends analog discrete signals to the FSEU for the
autoslat command function.
PSEU
The PSEU sends an air/ground discrete to the SMYD to set the
AIR MODE and flight leg count for faults recorded in non-volatile
memory (NVM). These are analog discretes sent from the nose
　
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