*
The airplane is on the ground
*
The nose gear is compressed
*
The ADIRU and the SAARU send incomplete pitot/static data (airplane not moving).
The WES system test enable signal is true when all these conditions are present:
*
Both engines fuel control switches are in the cut-off position (engines are not running)
*
Initiated test enable signal is true.
Master Warning lights
Each WEU channel verifies its ability to make the master warning lights come on. Each WEU channel must receive at least one master warning light (MWL) arm signal from one other channel, before it makes a master warning light come on. Each WEU channel verifies all MWL arm combinations.
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WES -SYSTEM TEST
The master warning lights will come on and then go out as each of the 4 WEU channels verifies its master warning light. You will see the master warning lights flash 4 times during the WES system test.
Each WEU channel verifies the status of a master warning light. If current flow is not present when a channel makes the master warning light come on, or if current flow is present when a channel makes the master warning light go off, the channel considers the light failed.
A MWL-L or R status message shows when a master warning light fails.
Aural Warning Speakers
Channel L1 does a test of the left aural warning speaker. Channel L1 must receive at least one aural arm signal from one other channel, before it sends a test tone for approximately 100 ms to the left aural warning speaker. Channel R1 does the same with the right aural warning speaker. You will hear a short test tone two times during the WES system test.
If a return voltage from the aural warning speaker is not present when a channel makes the test tone, or if a return voltage is present when a WEU channel makes the test tone, the channel considers the speaker failed.
A WARNING SPEAKER-L or R status message shows when an aural warning speaker fails.
Test Status
The MAT shows a WES SYSTEM TEST PASS message or a WES SYSTEM TEST FAIL after the WES system test ends.
Channel Failure
If a WEU channel fails during a system test, a WEU L1, L2, R1, or R2 EICAS status message shows.
Automatic WES System Test
The WEUs start a WES system test automatically when you apply power to the WEUs. However, the automatic test will start only if the WES system test enable signal is true.
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Software Loading
It is necessary to load software into the WEUs. The WEU software files are:
*
WEU OPC (operational program codes)
*
WEU OPS (operational program system)
*
WEU DB (data base).
The WEU OPC file supplies the warning electronics system (WES) customer options.
The WEU OPS file supplies the WEU operational software system.
The WEU DB file supplies the WEU data bases. Examples of the WEU data bases are stabilizer green band look-up tables, and stall warning function limits.
Software Interlock and ARINC 629 Input Port
A software interlock must be present before a channel accepts a software data load.
Each channel accepts software data loads through only one ARINC 629 input port. If that input fails the channel switches to its other ARINC 629 input port.
Maintenance Practices
Each WEU must have software files. Use the MAT to make sure each WEU has software files loaded. All channels must have the same software.
If the WEUs do not have software files in them, use the MAT to load the WEU software files.
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WES -GROUND TESTS -1
General
These are the WES tests you can do from the MAT:
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WES system test
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Takeoff configuration warning test
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Landing configuration warning test.
Landing Configuration Warning Test
The landing configuration warning test verifies the operation of the landing configuration warning function and the speedbrake alert function. You will notice a landing configuration warning when you do this test.
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