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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-502
General
The SMYDs use electrical power from these sources:
* 28v DC standby bus
* 28v DC bus 1
* 28v DC bus 2
* 28v AC standby bus
* 28v AC transfer bus 1
* 28v AC transfer bus 2
* 115v AC transfer bus 1.
Each SMYD gets a DC ground through the STALL WARN ASYM
MODE circuit breaker (CB). For the stall warning function (stick
shakers), the SMYD adds a bias to provide the stick shaker
warning sooner than normal when there is a LE asymmetry
indication. This CB provides a ground which enables this early
stall warning function of the SMYD. The CB may be used to
disable the early warning function and does not affect normal
stall warning.
SWS - SMYD - POWER INTERFACE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-505
SWS - SMYD - POWER INTERFACE
SWS - SMYD - POWER INTERFACE
EFFECTIVITY
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Page 25
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-505
General
These are the analog signals that the SMYD 1 receives from
other components and sensors:
* Left angle of attack sensor (AOA)
* Right TE flap position transmitter
* Trailing edge flaps up switch
* Leading edge devices asymmetry (FSEU)
* Leading edge devices uncommanded motion (FSEU)
* Main landing gear air/ground position (PSEU)
* Nose landing gear air/ground position (PSEU)
* Landing gear down and locked (PSEU)
* Stall warning panel self test
* Takeoff/go-around (TO/GA) switches
* Flight control B switch
* Yaw damper engage light
* Yaw damper engage switch
* Yaw damper actuator position (LVDT).
These are the eight program pins and options for each SMYD
computer:
* 0 - stall management yaw damper 1
* 1 - stall management yaw damper 2
* 2 - alternate flap
* 3 - FAA or CAA/FAA
* 4 - 737-600
* 5 - 737-800
* 6 - 737-700
* 7 - parity pin.
SMYD 1 calculates stall management functions and primary
yaw damping functions and sends analog signals and
commands for these systems and sensors:
* 28v dc autoslat solenoid valve power
* Autoslat valid signal
* Autoslat command
* Autoslat commanding logic (FSEU)
* Flaps not in takeoff range warning (PSEU)
* Captain control column stick shaker
* 28v dc yaw damper power
* Elevator feel shift module (EFSM)
* Yaw damper solenoid valve (main rudder PCU)
* Yaw damper EHSV command (main rudder PCU)
* Yaw damper engage switch solenoid.
SWS - SMYD - ANALOG INTERFACES - SMYD 1
EFFECTIVITY
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Page 26
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-506
SWS - SMYD - ANALOG INTERFACES - SMYD 1
SWS - SMYD - ANALOG INTERFACES - SMYD 1
EFFECTIVITY
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Page 27
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-506
General
These are the analog signals that SMYD 2 receives from other
components and sensors:
* Control wheel position sensor (Captain)
* Right angle of attack (AOA) sensor
* Left TE flap position transmitter
* Trailing edge flaps up position
* Leading edge devices asymmetry (FSEU)
* Leading edge devices uncommanded motion (FSEU)
* Main landing gear air/ground position (PSEU)
* Nose landing gear air/ground position (PSEU)
* Landing gear down and locked (PSEU)
* Stall warning panel self test
* Takeoff/go-around (TO/GA) switches
* Flight control A and B switches (OFF/STBY RUD)
* Yaw damper engage light
* Yaw damper engage switch
* Yaw damper actuator position (LVDT).
These are the eight program pins that connect to each SMYD
computer:
* 0 - stall management yaw damper 1
* 1 - stall management yaw damper 2
* 2 - alternate flap
* 3 - FAA or CAA/FAA
* 4 - 737-600
* 5 - 737-800
* 6 - 737-700
* 7 - parity pin.
SMYD 2 calculates stall management functions and WTRIS and
standby yaw damping functions and sends analog signals and
commands for these systems and sensors:
* 28v dc autoslat solenoid valve power
* Autoslat valid signal
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