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stall warning signal to the column stick shakers.
The SMYDs use the other data for bias calculations. If a bias is
active, the SMYDs send a stall warning signal at a lower AOA.
The SMYDs calculate all biases simultaneously and use the
highest bias. The SMYDs subtract the highest active bias from
the normal trip point schedule to decrease the trip point. These
are the biases that the SMYD calculates:
* LE flap and slat asymmetry bias (10.2 - 15.0)
* High thrust bias (0 - 13.6)
* LE UCM bias (2.3 - 6.7)
* TAI bias (0.8 - 5.3).
SWS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The leading asymmetry bias is set if one or more LE devices
are in a position that disagrees with the TE flaps.
The high thrust bias is enabled if the offside engine N2 is more
than 75% and the onside engine N1 is valid. This bias prevents
a pitch up stall tendency at low speeds and high thrust.
The high thrust bias does not change with each flap position. It
uses a signal for TE flaps less than or equal to 15 and a signal
for TE flaps more than 15. The maximum bias for flaps less than
or equal to 15 is 6.7 degrees. The maximum bias for flaps more
than 15 is 13.6 degrees.
The FSEU sends an uncommanded motion (UCM) signal during
lead edge UCM.
The thermal anit-ice (TAI) bias decreases the trip point to
account for 3.0 inches of rough ice on the LE devices. The TAI
bias is set when either the WING ANTI-ICE or ENG ANTI-ICE
switches are in the ON position. If the WING ANTI-ICE switch is
moved to the ON position for greater than 5 seconds, a TAI bias
latch is set for the remainder of the flight.
Speed Floor Stall Warning
The speed floor stall warning uses TE flap position data and
airspeed data. If the airspeed is too low for a specific TE flap
position, the SMYDs send a stall warning signal to the column
shakers. AOA is not used for the speed floor stall warning
calculation.
GUN 001-099, 101-113, 115, 201-999
EFSM Power Output
The stick shaker 28v dc standby bus power is used for elevator
feel shift module operation.
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SWS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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27-32-00-006
SWS - FUNCTIONAL DESCRIPTION
SWS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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SWS - FUNCTIONAL DESCRIPTION
SWS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 27-32-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-006
General
The stall warning software in the SMYDs make two calculations
for the elevator feel shift module (EFSM) operation. The first
calculation provides 28v dc to operate the stick shakers and
provide power to the EFSM. The second calculation, called the
elevator feel shift (EFS) command, provides an electrical
ground to operate the EFSM. The EFSM only operates if the
AOA is 8 to 11 degrees above the TAI stick shaker AOA.
Inputs
The proximity switch electronic unit (PSEU) provides air/ground
information for the air mode calculation.
The ADIRUs provide pitch angle and VCAS airplane speed.
The angle of airflow sensors provide AOA input.
The flap position transmitters provide flap position for the Delta
AOA calculation.
The mode control panel (MCP) is used for autopilot engage
status.
The digital electronics units (DEUs) are used to provide radio
altimeter RA and thermal anti-ice status.
EFS Set and Arm
The air mode calculation is the same as the stall warning air
mode calculation.
After takeoff, the EFS latch is set when the airplane is in the air
and the radio altitude is more than 100 feet.
The EFS latch is also set when the airplane is in the air and the
pitch attitude is more than 5 degrees.
The EFS is armed when the EFS latch is set and the autopilot is
not engaged.
EFS Inhibit
The elevator feel shift is inhibited when the airplane is not in the
air or when these conditions are true:
　
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