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* Autoslat command
* Autoslat command logic (FSEU)
* Flaps not in takeoff range warning (PSEU)
* First officer control column stick shaker
* 28v dc yaw damper power
* Elevator Feel Shift Module
* Yaw damper solenoid valve (standby rudder PCU)
* Yaw damper EHSV command (standby rudder PCU)
* Yaw damper engage switch solenoid.
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Digital Data Input to SMYD 1
SMYD 1 receives digital data from these systems:
* FMC 1
* FMC 2
* Left ADIRU (inertial data and air data)
* Right ADIRU (inertial data only)
* DFCS MCP
* DEU 1
* SMYD 2.
The FMC sends airplane gross weight and buffet margin speeds
to the SMYD.
The on-side ADIRU sends these inertial data to the SMYD on
ARINC high speed buses:
* Yaw rate
* Roll attitude
* Roll rate
* Lateral acceleration
* Pitch attitude
* Longitudinal acceleration
* Vertical speed.
The on-side ADIRU sends these air data to the SMYD on ARINC
429 low speed buses:
* Mach
* TAS
* CAS
* Impact pressure
* Static pressure
* Altitude
* Max operating speed.
The off-side ADIRU sends these inertial data to the SMYD on
ARINC 429 high speed buses:
* Yaw rate
* Roll attitude
* Roll rate
* Lateral acceleration.
The MCP sends DFCS engage status to the SMYD.
The DEU sends these display values to the SMYD on ARINC
high speed buses:
* Engine N1 and N2 RPM
* Radio altitude
* Position of the wing and engine anti-ice switches.
SMYD 2 sends this data to SMYD 1 on the cross-channel bus:
* Mach
* TAS
* Impact pressure
* Autoslat extend signal.
Digital Data Outputs From SMYD 1
SMYD 1 sends digital data to these systems:
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* A/T computer
* FCC A
* GPWC
* DEU 1
* DEU 2
* CPC 1
* CPC 2
* FDAU
* SMYD 2.
The SMYD sends minimum operating speeds and flap position
data to the A/T computer and on-side FCC. The FCC and A/T
use this data for their minimum speed calculations.
The SMYD sends minimum operating speeds and flap and AOA
data to the GPWC for windshear alert calculations.
The SMYD calculates the PLI symbol and minimum/maximum
safe operating airspeeds and sends this data to the on-side
DEU for display on the CDS.
The SMYD sends engine N1 and N2 RPM data (received from
the DEU) to the CPC. The CPC uses this as part of the takeoff
logic to detect throttle advance at the start of the takeoff roll for
pressurization of the airplane to prevent a cabin pressure bump
at rotation.
The SMYD sends on-side AOA data and other discrete data to
the FDAU for data recording.
Digital Data Input to SMYD 2
The SMYD 2 interface is similar to SMYD 1. SMYD 2 receives
digital data from these systems:
* FMC 1
* FMC 2
* Left ADIRU (inertial data only)
* Right ADIRU (inertial data and air data)
* DFCS MCP
* DEU 2
* SMYD 1.
Digital Data Outputs From SMYD 2
The SMYD 2 interface is similar to SMYD 1. SMYD 2 sends
digital data to these systems:
* A/T computer
* FCC B
* GPWC
* DEU 1
* DEU 2
* CPC 1
* CPC 2
* FDAU
* SMYD 1.
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27-32-00-508
SWS - SMYD - DIGITAL INTERFACES
SWS - SMYD - DIGITAL INTERFACES
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