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electro-hydraulic servo valve (EHSV) that controls the yaw
damper actuator on the main rudder PCU. This moves the
rudder for yaw damping.
Physical Description
These are the three hydraulic ports in the solenoid:
* Input pressure port for input hydraulic pressure
* Output port for the output to the EHSV and yaw damper
actuator
* Return port for hydraulic fluid to the reservoir.
An electrical connector connects the solenoid valve to the
SMYD computer.
Functional Description
When the yaw damper is engaged, it energizes the solenoid
valve which ports hydraulic fluid under pressure to the EHSV
and yaw damper actuator.
YDS - MAIN RUDDER PCU ACTUATOR - SOLENOID VALVE
EFFECTIVITY
SHZ ALL 22-23-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-007
YDS - MAIN RUDDER PCU ACTUATOR - SOLENOID VALVE
YDS - MAIN RUDDER PCU ACTUATOR - SOLENOID VALVE
EFFECTIVITY
SHZ ALL 22-23-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-007
Purpose
For primary yaw damping, the electrohydraulic servo valve
(EHSV) on the main rudder PCU changes an electrical
command signal from SMYD 1 into a controlled hydraulic flow
to the yaw damper actuator on the main rudder PCU. The EHSV
controls the rate and direction of the yaw damper actuator
motion for rudder movement to provide primary yaw damping.
Physical Description
These are the four hydraulic ports on the EHSV:
* Input port for jet pipe controller/control spool
* Return port
* Two output ports to the yaw damper actuator.
A four pin electrical connector the SMYD computer to the EHSV.
Functional Description
When an electrical signal for yaw damping comes from the
SMYD computer, it moves a jet pipe in the EHSV. This causes
the pressure at each end of the control spool to change. This
pressure differential causes the control spool to move, which
changes the output pressure in each of the two output ports.
This change in the output pressure directs hydraulic fluid under
pressure to move the yaw damper actuator in the desired
direction for yaw damping.
YDS - MAIN RUDDER PCU - ELECTROHYDRAULIC SERVO VALVE
EFFECTIVITY
SHZ ALL 22-23-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-008
YDS - MAIN RUDDER PCU - ELECTROHYDRAULIC SERVO VALVE
YDS - MAIN RUDDER PCU - ELECTROHYDRAULIC SERVO VALVE
EFFECTIVITY
SHZ ALL 22-23-00
Page 19
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-008
Purpose
The stall management yaw damper (SMYD) uses inertial data
from the ADIRU and other data from airplane sensors to detect
unwanted airplane yaw motion caused by dutch roll and
turbulence. The SMYD sends commands to the main rudder
PCU to move the rudder to reduce unwanted yaw.
Physical Description
The SMYD weighs 10 lbs. It uses 10 watts of power. It has these
features on the front of the unit:
* Standard Boeing BITE module
* Bite instructions on the label
* BITE display
* BITE keypad.
Bite Instructions
Bite instructions on the front of the SMYD LRU describe how to
do a test of the unit and use the BITE software.
For more information on BITE, see the section on BITE
Operation later in this section.
Display
The SMYD BITE module has a two line amber display. Each line
has eight alphanumeric characters. The display shows
messages about the type of fault, maintenance message
number, and fault details. For SMYD 1, the BITE interfaces
with the stall management functions and primary yaw damping
functions and provides fault data for these functions.
Keypad
You use the keypad to operate the SMYD BITE. The keypad has
these keys:
* ON/OFF key to turn ON the BITE
* MENU key to go to the main and previous menu pages
* UP arrow key for previous page selection in a menu
* DOWN arrow key for next page selection in a menu
* YES key to answer questions
* NO key to answer questions.
YDS - STALL MANAGEMENT YAW DAMPER
EFFECTIVITY
SHZ ALL 22-23-00
Page 20
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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