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gear, main gear and gear handle position.
The SMYD sends analog discrete data to the PSEU to use as
part of the takeoff warning function. The SMYD sends a ground
to the PSEU whenever the flaps are not in a valid takeoff range,
and an open discrete if they are.
Flaps Up Switches
The trailing edge flaps up limit switches send a signal to the
SMYD for flaps up logic. The SMYD uses this to limit rudder
travel for yaw damping and WTRIS when the flaps are up.
Flap Position Transmitter
The flap position transmitters send analog flap position data to
the SMYD when the flaps are not up.
Control Wheel Position Sensor
The captain control wheel (CW) position sensor sends an
analog signal to SMYD 2. This is used for the WTRIS function so
that SMYD 2 will command rudder movement in proportion to
pilot aileron input to assist turns during flight control manual
reversion when operating on standby hydraulics.
Opposite SMYD
The opposite SMYD provides data to the other SMYD for these
parameters:
* Mach
* TAS
* Impact pressure
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* Autoslat extend signal.
FCC
The SMYD sends minimum operating speeds and flap position
data to the FCC computers as part of the system engage logic.
DFCS uses the flight control minimum operating speeds for its
minimum speed calculations to change modes when the speed
is near a margin above stall.
A/T
The SMYD sends minimum operating speeds and flap position
data to the A/T computer. The A/T uses these data for its
minimum speed calculations.
GPWC
The SMYD sends minimum operation speeds, flap, and AOA
data to the GPWC for windshear alert calculations.
CPC
The DEUs send engine N1 and N2 RPM data to the SMYD. The
SMYD sends this data to the CPC to use as part of the takeoff
logic to adjust cabin pressure during the takeoff roll to prevent a
pressure bump at rotation.
FDAU
The SMYD sends AOA data and other discrete data to the FDAU
to record stall management and yaw damper status.
Stall Warning and Elevator Feel Shift
The SMYD sends a 28v DC discrete to its on-side control column
shaker motor to operate the stick shaker when airspeed is close
to stall, as calculated by the SMYD.
The SMYD activates the EFSM for the EFS function. EFS
operates through the elevator feel system to increase elevator
feel pressure to counteract or resist control column elevator up
movement when close to a stall.
Performance Data Displayed on CDS
SMYD calculates these performance data to show on CDS:
* Pitch limit indicator (PLI) symbol
* Minimum and maximum operating speed symbols.
Autoslat
Each SMYD sends a signal to the autoslat solenoid valve to
move the autoslats. The autoslat system extends the leading
edge slats from the mid-extend to the full-extend position for
trailing edge flap positions 1, 2, and 5 when the speed is less
than a minimum safe margin more than stall speed. The
autoslat system increases lift and improves airplane control
and maneuverability at lower speeds. The autoslat system
operates at lower AOA values than normal stall warning.
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Primary Yaw Damping
SMYD 1 sends analog command signals to the main rudder
PCU to engage primary yaw damping and move the rudder to
reduce unwanted yaw motion. Primary yaw damping requires
hydraulic system B pressure.
WTRIS and Standby Yaw Damping
SMYD 2 commands the standby rudder PCU to move the rudder
for WTRIS/standby yaw damping during non-normal operations.
This is only during manual reversion when both flight control
systems A and B switches are in OFF or STBY RUD. At least
one switch must be in STBY RUD.
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EFFECTIVITY
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27-32-00-502
SWS - SMYD - GENERAL DESCRIPTION
SWS - SMYD - GENERAL DESCRIPTION
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