General
The master warning lights come on when the WEU sends a ground signal. The warning lights come on if there is a warning condition.
The master warning lights go out when the warning condition goes out, or when the flight crew pushes the lights.
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WES -MASTER WARNING LIGHTS
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WES -SPEEDBRAKE LEVER, STABILIZER POSITION INDICATOR, FLAP LEVER
General
The speedbrake lever, stabilizer position indicator, and flap lever are not WES components. However, they are critical for WES operation.
Speedbrake Lever
The speedbrake lever moves the speed brakes.
Stabilizer Position Indicator
The stabilizer position indicators show the horizontal stabilizer position. Each indicator has three stabilizer green band lamps:
*
Nose down
*
Mid band
*
Nose up.
The stabilizer green band lamps show the correct horizontal stabilizer position range for takeoff. The WEUs makes the stabilizer green band lamps come on.
Flap Lever
The flap lever sets the trailing edge and the leading edge devices position.
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WES -SPEEDBRAKE LEVER, STABILIZER POSITION INDICATOR, FLAP LEVER
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WES -STICK SHAKER ACTUATOR
General
The stick shaker actuators are dc motors that shake the control columns when the airplane is near a stall condition.
The WEUs control the stick shaker actuators.
There are two stick shaker actuators, one below each control column.
Access
Access to the stick shaker actuators is from the forward equipment center.
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WES -STICK SHAKER ACTUATOR
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WES -INTERNALLY GENERATED WARNING AND ALERTS
Warning and Alerts
The WEUs receive airplane data to internally calculate and generate warnings and alerts. The four WEU channels vote to produce an alert or a warning. When any 2 out of the 4 channels make the same calculation, the WEUs make a warning or an alert.
These are the indications for warnings and alerts:
*
Alert message requests to the AIMS cabinets. The AIMS uses the requests to show alert messages
*
Master warning lights on
*
Alert aurals.
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WES -EXTERNALLY GENERATED WARNING AND ALERTS
Warning and Alerts
The WEUs receive warning and alert requests from airplane systems. In this case, the WEUs do not calculate an alert or a warning. The four WEU channels only vote to produce the alert or warning. When any 2 out of the 4 channels sense the same request, the WEUs make a warning or an alert.
These are the indications for warnings and alerts:
*
Master warning lights on
*
Alert aurals.
AIMS
The airplane systems also send warning and alert requests to the AIMS cabinets. The AIMS uses the requests to show alert messages.
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WES -STICK SHAKER ACTUATION
General
Each WEU channel independently calculates stick shaker actuator signals when the airplane is near a stall.
Interlocks
The stick shaker actuators come on only when the two channels inside a WEU produce a stick shaker actuation signal.
Any WEU can turn on both stick shaker actuators.
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WES -STICK SHAKER ACTUATION
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WES -TAKEOFF WARNING INHIBIT
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