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 4.  Operation (Figs. 2, 3, and 4)
_________
 A.  Functional Description
 (1)  
The stall warning system is enabled when airspeed is greater than 140 knots or when pitch angle is greater than 5°. Each SWMC receives data from the ADC and FCU's along with other sources. This information is processed by the computer to determine if the airplane is approaching a stall condition. The system remains enabled until airspeed becomes less than 40 knots.

 (a)  
When flaps are up, the AOA angle required for shaker activation is a function of the airspeed.

 (b)  
When flaps are not up, the AOA angle is a function only of the

 flap position: ~........................................................ | FLAP POSITION | AOA ANGLE FOR SHAKER ACTIVATION | .......................................................... | 1 | 4.0 | .......................................................... | 5 | 6.0 | .......................................................... | 10 | 7.7 | .......................................................... | 20 | 6.7 | .......................................................... | 25 | 6.0 | .......................................................... | 30 | 5.1 | 2.................…......................................1
 (2)  
When airplane flight conditions approach a stall due to a high angle of attack or low airspeed, 2 solid state output switches in the SWMC are turned on to supply a ground to the shaker motors. Each motor turns the weighted ring in the shaker which vibrates the control column.

 (3)  
Normally, each SWMC will activate both shakers simultaneously. However, if one is not activated, both control columns will still shake since they are connected together.

 B.  
Control

_______
 (1)  Operation of the stall warning system is automatic. No control functions are exercised.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

MAWEA
Stall Warning System Block Diagram Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

RIGHT FMC
FLAPS UP: SELECT THE HIGHER OF VSS OR VBFLO FOR SWMC-206: ABOVE 20.2K FT ALT WITH SPEED BRAKES RETRACTED, VSSNG IS DECREASED BY 100 KTS (TO FORCE
VBFNGLO = MANEUVER MARGIN TO BUFFET SPEED SELECTION OF VBFNGLO BY FMC) AND
VBFLO = MINIMUM BUFFET ONSET SPEED VSS IS NOT ALLOWED MORE THAN 5 KNOTS
VMIN = MINIMUM OPERATING SPEED ABOVE VBFLO.
VMLO = AMBER BAND SPEED
2 FLAPS NOT UP: SELECT THE HIGHER OF VSSNG (L) ORVSS = STICK SHAKER SPEED VSSNG (R)VSSNG = MANEUVER MARGIN TO STICK SHAKER SPEED
FLAPS UP: SELECT THE HIGHER OF VBFNGLO OR VSSNG (L) OR VSSNG (R)
Minimum Operating Speed and Minimum Maneuver Speed Flow Diagram
Figure 3

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

PRIMARY FLIGHT DISPLAY
SEE A
200
180
160
142
120
100
AIRSPEED TAPE
MAXIMUM OPERATING SPEED
MINIMUM MANEUVER SPEED
MINIMUM OPERATINGSPEED
A
PITCH LIMIT
Stall Warning System EFIS Displays
Figure 4

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