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changes from 1 (full gain) at Mach<0.3 to zero gain at Mach>
0.4.
For WTRIS and standby yaw damping, these are the limits for
rudder commands:
* 2 degrees with flaps up
* 2.5 degrees with flaps not up.
BITE
The SMYD has BITE test and continuous BITE. It stores failures
in fault history. The keypad is for operator interface. The display
shows test results and prompts for input.
WTRIS - SMYD 2 - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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WTRIS - SMYD 2 - FUNCTIONAL DESCRIPTION
WTRIS - SMYD 2 - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General
The yaw damper engage switch on the flight control panel is
used to turn ON the WTRIS and standby yaw damper. The yaw
damper disengage warning light is above the engage switch.
Engage Switch and Warning Light
To turn on the WTRIS and standby yaw damper, do these steps
on the flight control panel:
* Place both FLT CONT A and B switches to OFF
* Place at least one of these switches to STBY RUD
* Engage the yaw damper switch to ON.
The flight control A and B switches to OFF sends a signal to
enable SMYD 2 for WTRIS and standby yaw damping. One or
both of these switches to the STBY RUD position provides
standby hydraulic pressure to the standby rudder PCU to move
the rudder.
After you turn on the WTRIS and the standby yaw damper, and
after a two-second delay, the yaw damper engage light will go
off to show these systems are operating. If there is a system
fault, SMYD 2 will remove power from the engage solenoid
valve on the standby rudder PCU to shut off hydraulic fluid to the
EHSV. SMYD 2 also removes power from the yaw damper
engage switch on the flight control panel. After a two-second
delay, the engage switch moves to OFF and the yaw damper
disengage light comes ON to show the system has disengaged.
WTRIS - OPERATIONS
EFFECTIVITY
GUN ALL 27-24-00
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WTRIS - OPERATIONS
WTRIS - OPERATIONS
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 27-24-00
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27-24-00-011
WTRIS - OPERATIONS
WTRIS - OPERATIONS
EFFECTIVITY
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WTRIS - OPERATIONS
27-24-00
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General
SMYD 2 operates the wheel to rudder interconnect system
(WTRIS) and standby yaw damping during standby operations.
For WTRIS and standby yaw damping, SMYD 2 requires that
both flight control A and B hydraulic switches be OFF, with at
least one switch in STBY RUD to provide standby hydraulic
pressure to the standby rudder PCU.
Engage Switch and Warning Light
To engage the WTRIS and standby yaw damping, you put the
yaw damper engage switch on the flight control panel to the ON
position. Two seconds later, the yaw damper warning light goes
out to show these systems are operating. The switch is held in
the ON position with power from SMYD 2.
Put the switch in the OFF position to disengage the WTRIS and
standby yaw damping. The yaw damper warning light comes
on. The warning light comes on anytime the system is
disengaged. During a system fault and after disengagement,
the SMYD 2 removes power from the engage switch solenoid so
that the switch moves to the OFF position.
Training Information Point
The electrical ground for the disengage light is connected in
series through both SMYDs. For normal operation, both SMYDs
are necessary on the airplane.
You can do a test of the light with the master dim and test
　
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