Line key 1R (SAT AUDIT prompt) toggles satellite channel audit
on and off.
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.
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ACARS COMM AUDIT Page Figure 033
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RAM test The RAM test performs a simple write/read test over portions of RAM. All data stored in RAM are saved. If no errors are detected, then the status field displays the PASS indication for 5 seconds. If errors are detected, then the status field displays the FAIL indication for 5 seconds. While the test is performed, the status field displays the TEST indication.
LRU X test The LRU X TEST function, on page 2/2 of the ACARS TEST page, performs a simple loop back analysis to evaluate the status of the displayed LRU. The data field alongside the prompt line key displays initially the INITIATE indication. Actuation of the function changes the field 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 displaying 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 result causes the MU to display the FAIL indication. Five seconds after completing the test, the status changes to INITIATE. If a LRU specified for file transfer is not installed, then the MU:
-blanks the star ("*")
-displays NO LRU instead of INITIATE
-ignore actions on keys.
If the LRU is the slave FMC, then the MU:
-blanks the star ("*")
-displays the NO TEST instead of the INITIATE indication.
-ignore actions on keys.
If the LRU activity logic indicates that the displayed LRU is inactive, then the MU:
-blanks the star ("*")
-displays the INACTIVE indication instead of the INITIATE indication.
-ignore actions on keys.
When the LRU activity logic indicates that the displayed LRU
is active, then the MU displays:
-
the star ("*")
-
the INITIATE indication.
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(d) Communication status page (Ref. Fig. 034) The ACARS COMM STATUS page is selected by pushing line key 4L on the ACARS MAINTENANCE menu. The VHF link can be enabled for use and disabled by pushing line key 1L when allowed by the database. The ACARS MU indicates that the link status can be changed by displaying the prompt title SELECT. When SELECT is not displayed, then the link status cannot be changed. The default value is enabled for use and is indicated by displaying <OP>. Pushing line key 1L causes the VHF link to be disabled, when allowed by the database, and this is indicated by displaying <INOP>. Pushing line key again causes the VHF link to be enabled. The satellite link can be enabled for use and disabled by pushing line key 1R when allowed by the database. The ACARS MU indicates that the link status can be changed by displaying the prompt title SELECT. When SELECT is not displayed, then the link status cannot be changed. The default value is enabled for use and is indicated by displaying <OP>. Pushing line key 1R causes the satellite link to be disabled, when allowed by the database and this is indicated by displaying <INOP>. Pushing line key 1R again causes the satellite link to be enabled.
The ACARS MU ignores uplinks on an air/ground channel that is set to INOP.
Data field AAAAAA contains COMM when the VHF communications link is available and NOCOMM when the link is not available. When the VHF link is not selected (see line key 1L), then the status is NOCOMM.
Data field BBBBB contains DATA when the VHF link is in data mode and VOICE when the VHF link is in voice mode.
Data field CC displays the number of unsent downlinks in the VHF queue.
Data field FFFFFF contains COMM when the SAT communications link is available and NOCOMM when the link is not available. When the SAT link is not selected (see line key 1L), then the status is NOCOMM.
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