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The primary flight computers (PFCs) supply the speed brake lever not down signal to the WEUs.
Rudder Position
The PFCs supply the rudder position signal to the WEUs.
Each WEU channel has rudder not in takeoff position logic. This logic has the correct rudder position for takeoff. The logic compares the rudder position and the correct rudder position for takeoff. The rudder is in the correct position for takeoff when the trim value is 2 units or less.
If the rudder position is not in the correct takeoff position, the logic makes a rudder not in takeoff position signal.
Main Gear Steering Not Locked
The main gear steering unit (MGSU) supplies three discrete main gear steering not locked signals to the WEUs. Each WEU channel has vote logic. The vote logic makes the main gear steering not locked signal.
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WES -TAKEOFF CONFIGURATION WARNING FUNCTION INPUTS -3

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WES -TAKEOFF CONFIGURATION WARNING FUNCTION INPUTS -4

Airplane Doors Status
The WEUs receive passenger entry and cargo doors status from the proximity switch electronic unit (PSEU) 2.
All doors must be closed, latched, and locked before takeoff.
When any door is not closed, latched, and locked, each WEU channel makes doors not safe signals.
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WES -TAKEOFF CONFIGURATION WARNING FUNCTION INPUTS -4

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WES -TAKEOFF CONFIGURATION WARNING FUNCTION OPERATION

Operation
When the takeoff configuration warning enable is true, and the flight crew makes a takeoff attempt, the WEUs check for correct airplane takeoff configuration.
Before a WEU channel gives a takeoff configuration warning, at least one more channel must give the same warning.
EICAS Warning Messages
The WEUs supply an EICAS message request to the AIMS cabinets. The AIMS shows a warning EICAS message to the flight crew. Before a warning message shows, the AIMS must receive the same message request from at least two WEU channels at the same time.
The WEUs latch the digital signal to the AIMS cabinets for 10 seconds after the flight crew stops the takeoff attempt or after the takeoff warning inhibit starts. This is to make sure that the flight crew sees the EICAS message.
Master Warning Lights Reset
Push any master warning light to make the master warning lights go out. The siren continues until the takeoff configuration warning condition is clear.
Test
A test signal comes from the takeoff configuration warning test logic. The test signal arms the takeoff configuration warning function. If the airplane is not in a good takeoff configuration, the WEUs make a takeoff configuration warning.
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WES -TAKEOFF CONFIGURATION WARNING FUNCTION OPERATION

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777 AIRCRAFT MAINTENANCE MANUAL

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WES -STABILIZER GREEN BAND FUNCTION

Operation
The stabilizer green band function calculates the correct green band selections for takeoff. These are the three selections:
*
Nose up

*
Mid band

*
Nose down.

The WEUs use this data from the flight management computing function (FMCF) of the AIMS to calculate the green band selection:
*
Gross weight (GW)

*
Airplane center of gravity (CG)

*
Takeoff thrust rating.

The stabilizer green band selection goes to the takeoff configuration warning function.
Green Band Indications
The green band selection logic sends the stabilizer green band selection to the AIMS. The AIMS changes the green band selection into ARINC 429, and sends it to the stabilizer trim position indicators.
An airplane nose down selection makes the mid band lamp and the nose down lamp come on. An airplane nose up selection makes the mid band lamp and the nose up lamp come on. A mid band indication makes only the mid band lamp come on.
EFFECTIVITY
BEJ ALL

If the WEUs get a CG that is more than 44.0 or less than 14.0, the WEUs make all the stabilizer green band lamps go out. The WEUs also supply a STAB GREENBAND advisory EICAS message request to the AIMS.
The green band selection logic changes the stabilizer green band selection only when the takeoff configuration enable is true. When a takeoff attempt is true, the green band selection logic locks the selection in its present condition.
　
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