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WES -STABILIZER GREEN BAND FUNCTION
Test
When you do a takeoff configuration warning test from the MAT, you do a test of the stabilizer green band function of the WEUs.
The takeoff configuration warning test logic supplies a test signal to the green band selection logic. The green band selection logic makes all three green band lamps come on each stabilizer trim indicator.
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WES -TAKEOFF CONFIGURATION WARNING TEST
General
You start a takeoff configuration warning test from the maintenance access terminal (MAT). When you do a takeoff configuration warning test, you also do a stabilizer green band function test.
The takeoff configuration warning test logic checks the condition of the takeoff configuration warning and stabilizer green band function inputs. If any input is not present or is invalid, the test fails.
Initiated Test Inhibit
A WEU channel must make an initiated test inhibit signal as false before a takeoff configuration test can start.
When the initiated test inhibit signal is true, the WEU channels cannot start any test.
The initiated test inhibit signal within a WEU channel is false (a test can start) only when all these conditions are true:
*
Both engines are at less than takeoff thrust
*
The airplane is on the ground
*
The nose gear is compressed
*
The ADIRU and the SAARU send incomplete pitot/static data (airplane not moving)
*
Three or more WEU channels detect the same previous conditions.
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Test Signal
The takeoff configuration warning test logic supplies a test signal that is on for five seconds and then it goes off. The test signal goes to the:
*
Takeoff configuration warning function
*
Stabilizer green band selection logic
*
AIMS.
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. If the airplane is in a good configuration for takeoff, the WEUs do not make a takeoff warning.
The stabilizer green band selection logic supplies an all green band lamps on signal to the takeoff configuration warning test logic. The test signal goes to the AIMS. The AIMS sends the test signal to the stabilizer trim indicators. The indicators make all three green band lamps come on.
CONFIG WARN SYST Advisory Message
The AIMS shows the CONFIG WARN SYST EICAS advisory if the test fails. Each WEU channel latches the CONFIG WARN SYST message until you do another test or until you remove and reapply power to the WEUs.
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WES -TAKEOFF CONFIGURATION WARNING TEST
The AIMS shows the CONFIG WARN SYST EICAS advisory message only when two or more channels supply a test fail signal.
MAT Display
The MAT shows a TAKEOFF CONFIGURATION TEST FAIL message or a TAKEOFF CONFIGURATION TEST COMPLETE message after the test ends.
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WES -LANDING CONFIGURATION WARNING INPUTS -1
PSEU Inputs
The proximity switch electronic unit (PSEU) supplies landing gear position to the WEUs. The WEUs make an all gear down and locked signal.
Ground Proximity Gear Override Switch
The ground proximity gear override switch supplies an on signal to the WEUs.
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