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normal position.
The relief valve slide assembly is spring biased to the closed
position. At 1300 psi it starts to open. An internal orifice limits
the flow rate to 900 psi or less when the valve is open.
Normal Operation
During normal operation, there is no EFSM hydraulic output
pressure to the dual feel actuator. The feel pressure is not
changed by the EFSM. The EFSM receives 3000 psi nominal
system A pressure. The pressure reducer provides 850 psi to
the mode valve. The mode valve remains closed until SMYD 1
or SMYD 2 commands the dual coil solenoid valve to open
during a stall.
EFSM Operation
At stall onset, either SMYD sends a signal to energize the dual
coil solenoid valve on the EFSM. The EFSM operation occurs
when all of these conditions occur:
* Stick shaker is active
* AOA is 8 to 11 degrees more than thermal anti-ice (TAI)
biased stick shaker AOA
* EFSM is not inhibited due to low altitude or the airplane is on
the ground.
SWS - ELEVATOR FEEL SHIFT MODULE
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 27-32-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-008
When all of these conditions occur, the SMYDs energize the
dual coil solenoid valve. The solenoid valve sends 3000 psi
system A pressure to the pressure-operated mode valve.
The mode valve opens and sends pressure between 820 psi to
880 psi from the pressure reducer to the system A side of the
dual feel actuator. This increases the control column feel forces
up to four times nominal feel. The increased feel force makes
sure the pilots cannot easily override automatic stabilizer
movement to nose down pitch of the airplane.
Pressure Reducer Failure
If the pressure reducer fails, the relief valve opens at 1300 psi
and provides a maximum output of 900 psi to the dual feel
actuator. The elevator FEEL DIFF PRESS light comes on after 30
seconds.
See the elevator and tab control system section for more
information about the elevator FEEL DIFF PRESS light.
(SECTION 27-31)
Training Information Point
There is no flight deck annunciation that the EFSM is armed or
operating during a stall.
SWS - ELEVATOR FEEL SHIFT MODULE
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 27-32-00
Page 46
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-008
SWS - ELEVATOR FEEL SHIFT MODULE
SWS - ELEVATOR FEEL SHIFT MODULE
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 27-32-00
Page 47
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-008
THIS PAGE IS INTENTIONALLY LEFT BLANK
SWS - ELEVATOR FEEL SHIFT MODULE
27-32-00
Page 48
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The SMYDs do two calculations for stall warning. These are the
normal stall warning and the speed floor stall warning
calculations. Either calculation can cause an SMYD to send a
stall warning signal to a column shaker.
SMYD 1 controls the captain column shaker and SMYD 2
controls the first officer column shaker.
Stall warning is only available when the airplane is in the air.
Air Mode
During takeoff, the air mode latch is set when these conditions
are true:
* AIR/GRD system (1 or 2) in air
* Nose landing gear (NLG) in air.
The latch is also set to the air mode when these conditions are
true:
* AIR/GRD system (1 or 2) or NLG in air
* Airspeed more than 110 knots.
The air mode latch is reset when the initial set conditions are
removed, the pitch angle is less than 5 degrees, and the
airspeed is less than 105 knots.
Normal Stall Warning
Normal stall warning uses this data:
* Angle of attack (AOA)
* TE flap position
* LE flap and slat asymmetry information
* LE uncommanded motion (UCM) information
* Engine thrust settings (N1 and N2)
* Computed airspeed (VCAS)
* Wing and engine thermal anti-ice switch (TAI) status.
A normal stall warning schedule sets the AOA trip point for
each TE flap position. The AOA trip point values change from
13.0 to 23.5 degrees depending on flap position. If the AOA is
more than the trip point for a TE flap position, the SMYDs send a
　
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