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Attack. Vmin shows as an alternating red and black strip symbol
at the bottom of the airspeed indicator. It is the speed at which
the stick shaker operates for normal stall warning.
Vmax is the maximum safe design operating airspeed. The
SMYD calculates Vmax as the least value of VMO/MMO,
landing gear down, or flap placard limit speeds. Vmax shows as
an alternating red and black strip symbol at the top of the
airspeed display.
SWS - SMYD - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-32-00
Page 36
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-510
Vmvr speeds are the minimum and maximum safe airspeeds
that provide a safe margin for maneuver in turbulence or with
flaps extended and for low and high speed buffet margins.
These speeds show as an amber band on the airspeed display
and are an extension of the alternating red and black strips for
Vmin and Vmax. The amber band becomes active on the
display at first flap retraction after liftoff. The SMYD calculates
these speeds as a function of gross weight, altitude, and other
parameters. The SMYD also uses FMC calculated buffet
speeds.
Vf is flap retraction speed. It is the minimum speed for flap
retraction to the next operational flap setting. It is calculated
from flap position and stick shaker speed and shows on the CDS
only during flap retraction modes such as in climb-out or goaround.
Veo is the engine out speed. It is the flaps up engine out speed
for the drift down procedure. It is calculated from gross weight
and atmospheric pressure and only shows when flaps are up
and in the air mode.
Primary Yaw Damping
SMYD 1 calculates commands for primary yaw damping and
turn coordination. SMYD 1 sends analog command signals to
the yaw damper components and actuator on the main rudder
PCU to move the rudder to reduce unwanted airplane yaw
motion. Primary yaw damping is used during normal operations
and uses hydraulic system B pressure. To engage the primary
yaw damper, turn ON hydraulic system B and do these steps on
the flight control panel:
* Put the FLT CONTROL B switch to ON
* Put the YAW DAMPER switch to ON.
For primary yaw damping, rudder left/right movement is limited
to 2 degrees with flaps up, and 3 degrees with flaps down.
For yaw damper operation see the Yaw Damper System.
(SECTION 22-23)
WTRIS and Standby Yaw Damping
SMYD 2 calculates commands for WTRIS and standby yaw
damping/turn coordination. SMYD 2 sends analog command
signals to the standby yaw damper components to move the
yaw damper actuator on the standby rudder PCU. This moves
the rudder for the wheel to rudder interconnect system (WTRIS)
and for standby yaw damping.
SWS - SMYD - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-32-00
Page 37
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-510
The purpose of WTRIS is to help turns during flight control
manual reversion. During manual reversion with standby
hydraulics ON, the WTRIS uses data from the control wheel
sensor (Capt) to make a small command input to move the
rudder in proportion to pilot control wheel (aileron) inputs
during turns. WTRIS and standby yaw damping are not normal
operations and standby hydraulic pressure is necessary. To
engage WTRIS and standby yaw damping, do these steps on
the flight control panel:
* Put both FLT CONTROL switches to OFF
* Put at least one FLT CONTROL switch to STBY RUD
* Put the yaw damper switch to ON.
Both FLT CONTROL A and B switches must be off to enable
SMYD 2, and one or both switches must be in the STBY RUD
position to provide standby hydraulic pressure.
WTRIS only operates at Mach < 0.4. The gain schedule varies
from 1 (full gain) at Mach < 0.3 to zero gain at Mach > 0.4.
For WTRIS and standby yaw damping, rudder left/right travel
limit is 2 deg with flaps up, and 2.5 deg with flaps down. See the
WTRIS section for more information. (SECTION 27-32)
SMYD BITE
The SMYD has BITE functions for continuous monitoring of the
SMYD LRU. The SMYD also has BITE tests to detect and record
faults for the stall management and yaw damping functions.
The BITE module, keypad, and display on the front of the SMYD
LRU are used for interaction with the SMYD BITE for servo tests,
self-tests, and display of fault information for stall management
functions and yaw damping functions.
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