Transmit 429 data page
 (Ref. Fig. 027)
 The ACARS TX 429 DATA page is accessed via the ACARS STATUS
 page.
 The purpose of this page is to display the status of the 429
 words broadcast by the MU. The bits of labels 030, 172, 270
 and 377 are displayed on this page.
 Line key 2L is used to select the 429 word to be displayed.
 The initial value is label 172.

R 1EFF : 001-049, 101-105, 1 23-26-00Page 38 1 1 May 01/05 1 1 1CES 1

 ACARS TX 429 DATA Page Figure 027 
R 1EFF : 1 1 1CES  001-049, 101-105,  1 111 23-26-00 Page 39 May 01/05

 Every time that line key 2L is pushed, the label changes to
 the next value in the sequence (030, 172, 270, 377). When
 label 377 is displayed and line key 2L is pushed, then label
 030 is displayed. Bits 32 to 9 inclusive of the selected label
 are displayed on line 9, adjacent to line keys 4L and 4R.
 4_ LRU status page
 (Ref. Fig. 028)
 The ACARS LRU STATUS page is accessed via the ACARS STATUS
 page. The ACARS LRU STATUS page displays the state of the
 activity logic for each LRU. The name of each LRU is displayed
 in columns 1-10 and its status in columns 12-24. The ACTIVE
 indication is displayed for each active LRU and the INACTIVE
 indication is displayed for each inactive LRU.
 If an LRU is not installed, according to either the aircraft
 configuration broadcast words, the Application, database, or
 the default LRU configuration specification, then the
 corresponding field shows the NOT INSTALLED indication. If an
 LRU is installed but no 429 broadcast words are processed, the
 NO 429 DATA indication is displayed. If an LRU name is not
 supplied, then neither the name or status will be displayed.
 Actuation of LSK 6R (PRINT prompt) attempts to print the ACARS
 LRU STATUS page on the cockpit printer.
 Actuation of LSK 6L (RETURN TO STATUS MENU prompt) returns the
 user to the ACARS STATUS menu.
 5_ Discrete status page
 (Ref. Fig. 029, 030)
 The ACARS DISCRETE pages are accessed via the ACARS STATUS
 page. The status of the ACARS discrete inputs and outputs are
 displayed and updated at 1 second intervals.
 The character "1" represents an open circuit and the character
 "0" represents ground on the MCDU page generated by the MU.

 (c) Test page (Ref. Fig. 031) The ACARS TEST page is selected via the ACARS MAINTENANCE page. The first page of the ACARS TEST page enables the user to exercise basic features of the ACARS system. The ACARS TEST 2/2 page enables the user to perform a SOLO word loop back test on LRUs. Test functions are activated by pushing the following MCDU keys:
R 1EFF : 001-049, 101-105, 1 23-26-00Page 40 1 1 May 01/05 1 1 1CES 1

 ACARS LRU STATUS Page Figure 028 
R 1EFF : 1 1 1CES  001-049, 101-105,  1 111 23-26-00 Page 41 May 01/05

 ACARS DISCRETE Page 1/5 to 3/5
 Figure 029

R 1EFF : 001-049, 101-105, 1 23-26-00Page 42 1 1 May 01/05 1 1 1CES 1

 ACARS DISCRETE Page 4/5 to 5/5
 Figure 030

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 ACARS TEST Page Figure 031 
R 1EFF : 1 1 1CES  001-049, 101-105,  1 111 23-26-00 Page 44 May 01/05

 Page 1 Line key 1L (VHF LINK prompt) - VHF Link Test Line key 2L (PRINTER prompt) - Printer Interface Test Line key 3L (COMM AUDIT prompt) - Display Audit screens
 Line key 1R (SAT LINK prompt) - Satellite Link Test Line key 2R (SDU prompt) - SDU Interface Test Line key 3R (MCDU TEST prompt) - MCDU Screen Test Line key 5R (RAM TEST prompt) - MU RAM Test
 Page 2 Line key 1L (LRU1 designation) - LRU1 Interface Test Line key 2L (LRU2 designation) - LRU2 Interface Test Line key 3L (LRU3 designation) - LRU3 Interface Test Line key 2R (LRU4 designation) - LRU4 Interface Test Line key 3R (LRU5 designation) - LRU5 Interface Test
 The LRU names displayed on the second page are dependent upon which LRUs are installed.
 Actuation of line key 6L (RETURN TO MAINT MENU prompt) returns the user to the ACARS MAINTENANCE page.
 1_ VHF link test
 The LINK TEST function attempts to downlink a label Q0 message
 to the ground network. If there is another downlink message
 queued, then its success will be used for purposes of this
　
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