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The data field displayed alongside the line key indicates the status/results of the test, initially displaying INITIATE indication. When the function is first selected, the status changes to TEST to indicate that the test is active. The asterisk (*) alongside the line key also changes to a blank. Attempts to initiate the test while the asterisk is missing are ignored. If the message containing the test pattern is determined to be undeliverable, the status changes to FAIL and the asterisk is shown again. If the data transfer is successful, the status changes to PASS and the asterisk disappears. Five seconds after completing the test, the status changes to INITIATE.
MCDU test (Ref. Fig. 032) The MCDU TEST function causes the MU to display the ACARS-MCDU-SCRN-TEST page. From this page, the user may select line key 6L (RETURN TO TEST MENU prompt) to return to the ACARS TEST menu, or select line key 6R (PRINT prompt) to print the page.
Satellite link test The SAT LINK test function is disabled because the SDU is not installed, so the MU displays the NO SDU indication and the asterisk is blanked.
SDU test The SDU test function is disabled because the SDU is not installed, so the MU displays the NO SDU indication and the asterisk is blanked.
SDU test The SDU TEST function performs a simple loop back analysis to evaluate the status of the SDU. The data field alongside the prompt line key initially displays INITIATE. When the function is selected, the field changes to TEST, and the asterisk alongside the line key changes to a blank. Attempts to initiate the test while a file transfer is in progress results in the display of the BUSY indication while a file transfer is in progress, then a return to INITIATE. If the TEST is correct, then the MU changes the status field to PASS and displays the prompt asterisk. Any other results cause the MU to display the FAIL indication. Five seconds after completing the test, the status changes to INITIATE.
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ACARS-MCDU-SCRN-TEST Page
Figure 032
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If the LRU activity logic indicates that the SDU is inactive, then the MU:
-blanks the asterisk
-displays INACTIVE or INITIATE
-ignores key actuations.
When the LRU activity logic indicates that the SDU is active,
the MU displays:
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the asterisk
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the INITIATE indication.
Common audit
(Ref. Fig. 033)
The VHF and satellite communication AUDIT function is
monitored via the ACARS COMM AUDIT page. This page is accessed
via the ACARS TEST 1/2 page.
Line key 1L (VHF AUDIT prompt) toggles VHF audit on and off.
Line key 2L (UPLINKS prompt) enables/disables printing of
uplinks addressed to this aircraft.
Line key 3L (DOWNLINKS prompt) enables/disables printing of
downlinks from this aircraft.
Line key 2R (LABEL FILTER prompt) enables/disables filtering
of uplinks and downlinks.
Line key 3R (LABEL prompt) enters label to be used for label
filter.
Access to each audit function can be separately disabled by
the application.
Common audit
The VHF and satellite communication AUDIT function is
monitored via the ACARS COMM AUDIT page. This page is accessed
via the ACARS TEST 1/2 page.
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