-
The AFS TEST IS RUNNING indication comes into view.
On the MCDU, after approximately 40 seconds, at the end of the test:
-A second page comes into view.
-
The AFS TEST COMPLETED indication comes into view.
-
The PASS indication comes into view.
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-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
-If the LRU is not correct.
3. If the LRU is not correct:
-
Push the line key adjacent to the (LRU): PRESS LINE KEY indication.
-
Push the line key adjacent to the ISSUED BY XX indication.
-Use the results you get.
4.
On the MCDU, push the line key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.
Close-up
________
Subtask 22-96-00-862-050
-
The PRESS LINE KEY indication comes into view.
On the MCDU :
-
The AFS/TEST REPORT page comes intoview and shows the failure indicationand the computer which found the failure.
-
The AFS/TEST REPORT TROUBLE SHOOTINGDATA page comes into view. This shows the result of the analysis and the snapshot that gives the status of variables when the failure occurred.
A. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
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LAND CAT III CAPABILITY TEST - DESCRIPTION AND OPERATION
________________________________________________________
1. General
_______
The purpose of the test is to verify the capability of the involved systems R to perform a CAT 3 DUAL fail-operational automatic landing. It also verifies R the takeover and priority pushbutton switches, the A/THR instinctive
disconnect pushbutton switches and the warnings associated to the automatic
landing.
The LAND TEST function is mainly performed in the FIDS and utilizes FG
failure detection (snapshot, analysis and reporting).
Consequently, the LAND TEST efficiency is identical to the FG BITE
efficiency.
2. System Description
__________________
All along the test, the operator is provided with:
-instructions to be applied (guided test) and visual indications on the MCDU pages
-
audio indications. The principle is to trigger a BITE analysis if the operator has pushed "YES" line key at the first question, or "NO" for one of the others and then to build a report and display it. No specific tool is required to perform this test. The initial conditions are: aircraft on ground and power supply on.
A.
Test Acceptation LAND TEST selection on the MCDU causes transmission by the FIDS of a request (LAND TEST REQUEST), confirmed by the ground condition (hard-wired discrete), to four FMGC BITEs (FG1 COM, MON, FG2 COM, MON). Each BITE sends the request signal to the operational software which generates the answer (LAND TEST ACCEPTATION). This answer is then sent back to the FIDS to authorize LAND TEST initiation. The four acceptations from the four BITEs are required by the FIDS to authorize the test. In absence of acceptation, the LAND TEST REFUSED message is displayed on the first AFS/LAND TEST-1 page. If the text execution request is authorized, the FIDS generates the different pages to be displayed on the MCDU and dialogues with the four BITEs to perform the test.
B.
Test Principle This test consists in checking the correct operation of the systems inside and outside the AFS and involved in CAT 3 automatic landing (correct operation of BITEs, correct system reception, self-test results, interconnections validity).
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C. Test Running (Ref. Fig. 001, 002) If a failure occurs prior to the acceptation phase, the test is refused as mentioned above. If a failure occurs after the acceptation phase, the FMGCs remain in LAND TEST condition since the aircraft is on ground with engines shut down. From AFS/LAND TEST-4 page, the operator must answer questions by YES or NO via the MCDU. NOTE: Please answer by YES if agree with sentence, NO if disagree. If the answer is YES, the test continues until the last page is displayed (AFS/LAND TEST-9) with TEST OK final message. If the answer is NO :
-an analysis is made at the level of the AFS BITEs in order to detect and isolate the failure, and
-a failure message is displayed on the AFS/LAND TEST REPORT page requesting to check the system concerned by the analysis. NOTE: Each AFS/LAND TEST page displays an END OF TEST indication. Pressing the line key adjacent to this indication results in the transmission of an END OF TEST FIDS command to the four FG BITEs. Reception of this command causes loss of the LAND TEST ACCEPTATION condition for each BITE.
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