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WES -STALL WARNING FUNCTION TEST
General
Start a stall warning function test from the maintenance access terminal (MAT).
The stall warning function test does a check of the stall warning function in each WEU channel. The stall warning function test also verifies the condition of the stall warning 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 stall warning function 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.
Stall Warning Function Test Logic
The stall warning function test logic receives the stall warning test signal from the AIMS cabinets. The stall warning function test logic supplies test signals that are on for 2 seconds and then go off. The stall warning function test logic does these functions:
*
Makes the pitch limit indicators on the PFD go to 10 degrees
*
The PFD speed tape shows a maximum operating speed (Vmo) of 50 knots, and a minimum speed limit of 30 knots
*
Makes an auto slat enable signal that goes to a hydraulic interface module (HYDIM) and the flap slat electronic units (FSEUs)
*
Makes the stick shaker actuators come on
*
Verifies the condition of the stall warning function inputs
*
Supplies test results to the MAT.
WARNING: IF THE FLAP LEVER IS AT 1,5,15, OR 20 AND HYDRAULIC POWER IS APPLIED TO THE AIRPLANE, THIS TEST WILL CAUSE THE LE SLATS TO MOVE FROM SEALED TO GAPPED. THIS LE SLAT MOVEMENT CAN BE PREVENTED BY SETTING BOTH THE C1 AND C2 AIR SWITCHES (P5 HYDRAULIC PANEL) TO THE OFF POSITIONS.
MAT Display
The MAT shows a STALL WARNING TEST FAIL message or a STALL WARNING TEST PASS message after the test ends.
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WES -SYSTEM TEST
General
Use the MAT to start a WES system test. During the WES system test, each channel verifies:
*
Its internal status
*
The ARINC 629 inputs
*
The ARINC 429 inputs
*
All analog discrete inputs
*
That all WEU channels have the same software
*
Correct operation of the master warning lights and the aural warning speakers.
Each channel does the first five operations independent of each other. The four channels operate synchronously during the last operation.
The system test lasts approximately 20 seconds.
Initiated Test Inhibit
When the initiated test inhibit signal is true, the WEU channels cannot start any test.
These conditions must be true before you can do any WES test:
*
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)
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* Three or more WEU channels detect the same previous conditions.
Initiated Test Enable, WES System Test Enable
Each WEU channel must make an initiated test enable signal and a WES system test enable signal before a WES system test can start.
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