(3) Remove the access platform(s).

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 OPERATIONAL USE (ACARS) - DESCRIPTION AND OPERATION
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 1.
 General

_______ The Multipurpose Control and Display Unit (MCDU) is used as an interface between the operator and the Aircraft Communication Addressing and Reporting System (ACARS). It provides the means necessary to enter the text into the ACARS for data storage, data review and transmission-System Status and ground-to-air voice signaling functions are also presented on the MCDU. The ACARS Management Unit (MU) is interfaced with three MCDUs.

 2.
 System Description

__________________
 The MCDU is used for various systems:

 -
the Centralized Fault Display System (CFDS)

 -
the Aircraft Communication Addressing and Reporting System (ACARS)

 -
the Aircraft Integrated Data System Data Management Unit (AIDS DMU)

 -
the Flight Management function (FM).

 3. Operation/Control and Indicating
________________________________ This paragraph describes the interaction of the MU with the MCDU. The formats pictured here depict the exact layout of each page. Along each side of the display are six line select keys. The arrows off to the sides of each display format by the line select keys indicate the section number that defines the display to be called up or the action to be taken for that key. When the MCDU is initially powered up, it establishes contact with each LRU connected to it. When the ACARS MU is given control of an MCDU, the MU displays the ACARS MENU page. The ACARS MENU page is the root page through which all other ACARS pages may be accessed. (Ref. Fig. 001, 002, 003, 004) Each page of the ACARS Main Menu can display different data bases. These pages are created upon energization of aircraft electrical network and are recreated when the flight phase changes from preflight to inflight, from inflight to postflight, and from postflight to preflight. When the flight phase changes or the aircraft electrical network is energized, then the MU updates the text and functions displayed on the ACARS Main Menu.
 A. Preflight Initialization (Ref. Fig. 005) On the ACARS PREFLT MENU page, by pushing the line key adjacent to the PREFLIGHT indication, you get the ACARS PREFLIGHT INIT page. (Ref. Fig. 005) On this page, preflight initialization information is given in these fields:
 (1) FMC FLT NO: It displays the FMC flight number. The default value is white dashes.
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 ACARS PREFLT MENU Page 1/2
 Figure 001

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 ACARS PREFLT MENU Page 2/2
 Figure 002

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 ACARS INFLT MENU Page Figure 003 
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 ACARS POSTFLT MENU Page Figure 004 
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 ACARS PREFLIGHT INIT Page
 Figure 005

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 (2)
 ACARS FLT NO: It displays the ARINC flight number. The default value is white dashes, however, the MU will try to initialize this parameter from the FMC flight-number broadcast-data. The line key 2L and the alphanumeric keyboard can be used to overwrite the MU generated value. Up to 4 alphanumeric characters can be entered. If less than 4 characters are entered, then the MU will right-justify the data and fill with zero characters.

 (3)
 ORIGIN: It displays the origin. The default value is white dashes.

 (4)
 DESTINATION: It displays the destination. The default value is white dashes.

 (5)
 CAPTAIN: It displays the Captain's name or identifier which can be entered by the crew. The default value is cyan brackets.

 (6)
 UTC: It displays the Universal Time Coordinated. The default value is white dashes.

 (7)
 DATE: It displays the date. The default value is white dashes.

 (8)
 ALT DEST: It displays the alternate destination. The default value is white dashes.

 (9)
 FIRST OFF: It displays the First Officer's name or identifier which can be entered by the crew. The default value is cyan brackets.

 B. Delay Report (Ref. Fig. 006) The ACARS DELAY REPORT page is accessed by pushing the line key adjacent to the DELAY indication on the ACARS PREFLT MENU page.
　
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