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(EFS) function to increase elevator feel pressure to counteract
control column elevator up movement.
Autoslat System
The autoslat system commands the leading edge slats to
extend from the mid-extended to the full-extended position for
flaps 1, 2, and 5 when the speed is less than a safe margin
above stall. Autoslat operates at an angle-of-attack that is less
than for stick shaker speed.
Performance Data
The SMYD calculates airplane performance data for display on
the CDS. These include the pitch limit indicator (PLI) symbol and
minimum and maximum safe operating speed symbols.
Primary Yaw Damping and WTRIS/Standby Yaw Damping
The yaw damping function of the SMYD does primary yaw
damping, standby yaw damping, and WTRIS.
Abbreviations and Acronyms
* AC - alternating current
* actr - actuator
* ADI - attitude direction indicator
* ADIRU - air data inertial reference unit
* ADR - air data reference
* AOA - angle of attack
* ARINC - Aeronautical Radio, Inc.
* asym - asymmetry
* A/T - autothrottle
* ATR - austin trumbull radio
* BITE - built-in Test equipment
* CAA - civil aviation authority
* CAS - computed airspeed
* capt - captain
* CDS - common display system
* CDU - control display unit
* cmd - command
* cmptr - computer
* com - common
* cos - cosine
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* CPC - cabin pressure controller
* CPU - central processing unit
* CW - control wheel
* DC - direct current
* DEU - display electronics unit
* DFCS - digital flight control system
* DU - display unit
* EFS - Elevator Feel Shift
* EFSM - Elevator Feel Shift Module
* elex - electronic
* eng - engage
* exc - excitation
* FAA - federal aviation administration
* FCC - flight control computer
* FDAU - flight data acquisition unit
* FMC - flight management computer
* FMCS - flight management computer system
* f/o - first officer
* FSEU - flap slat electronics unit
* fwd - forward
* gnd - ground
* GPWC - ground proximity warning computer
* ind - indicator
* I/O - input/output
* IR - inertial reference
* L - left
* LE - leading edge
* LRU - line replaceable unit
* lt - light
* LVDT - linear variable differential transformer
* MCP - mode control panel
* mgt - management
* MLG - main landing gear
* NLG - nose landing gear
* NVM - non-volatile memory
* N1 - engine low pressure rotor (fan) speed
* N2 - engine high pressure rotor speed
* PCU - power control unit
* perf - performance
* PLI - pitch limit indicator
* pos - position
* PSEU - proximity switch electronics unit
* R - right
* req - request
* sin - sine
* SMYD - stall management yaw damper
* snsr - sensor
* stby - standby
* sw - switch
* SWS - stall warning system
* TE - trailing edge
* T/O - takeoff
* TO/GA - takeoff/go-around
* UCM - uncommanded motion
* V - volt
* Vmin - minimum safe airspeed
* Vmax - maximum safe airspeed
* Vmvr - min/max safe maneuvering speeds
* warn - warning
* WTRIS - wheel to rudder interconnect system
* xfr - transfer
* xmtr - transmitter
* YD - yaw damper
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General
The stall management yaw damper computer (SMYD) uses
analog and digital inputs signals from airplane systems and
sensors to calculate commands for these systems:
* Stall warning system and elevator feel shift (EFS)
* Autoslat system
* Performance data for display on CDS
* Primary yaw damping and turn coordination
* WTRIS and standby yaw damping/turn coordination.
Stall warning, EFS, autoslat, and performance data are part of
the stall management function of the SMYD.
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