-Pre-key: all the bits are at 1. This phase enables adjustment of VHF transmission and reception levels.
-Bit synchro: enables to cross check the bits value.
-Character synchro: enables to establish synchronization on the characters.
-Start of heading: indicates the start of data transmission.
-Mode: enables selection of a ground station or a specific group of ground stations for communication with the aircraft.
-Address: contains the identification of the aircraft which transmits or receives the message.
-Technical acknowledgement: acknowledgement (either positive or negative) related to the last message received.
-Label: identifies a specific type of message.
-Uplink block identifier: only appears in the messages transmitted by the ground. Enables the aircraft to detect duplicated ground messages (aircraft-to- ground messages may have a downlink block identifier to enable detection of duplicated aircraft messages on the ground).
-Start of text: indicates the start of useful data transmission.
-Text: useful data. Only one part of the ISO 5 characters can be
transmitted in this field R (Ref. Fig. 008)
-Suffix: indicates the end of useful data transmission.
-Block check sequence: result of a computation made before transmission on the previous bits set. At reception, the same computation is made and the two results are compared. If they are identical, the transmission is correct.
-BCS suffix: indicates the end of transmission.
(3) Exchange protocol between the aircraft and the ground This protocol is described in the ARINC 597 Specification (to which the ARINC 724B refers for the description of this protocol).
R 1EFF : 001-049, 051-099, 101-105, 1 23-24-00Page 20 1 1 May 01/05 1 1 1CES 1
ACARS - Characters Transmittable in the Useful Data Field R Figure 008
R 1EFF : 001-049, 051-099, 101-105, 1 23-24-00Page 21 1 1 May 01/05 1 1 1CES 1
7. Test____
R **ON A/C 001-049, 101-105,
R (Ref. Fig. 009, 010, 011, 012, 013, 014, 015) The state of the ACARS is determined by monitoring the exchanges of information that it can have with the associated processing card. If the exchange protocol is correct, the data transmitted is in the correct format and the ACARS does not declare that it is wrong further to its own internal test, then the ACARS is said to be operational. If not, it is declared to be faulty. The state of the ACARS is determined by monitoring the exchanges of information that each of the processing cards can have with its corresponding ACARS and by analysing the results of the internal tests of each of the processing cards. There are two operation modes: - normal mode: during the normal mode, the BITE monitors cyclically the status of the ACARS cards and transmits these data to the CFDIU during the concerned flight. In case of fault detection the BITE stores the information in the fault memory. - menu mode: the menu mode can only be activated on the ground and the command is given by the CFDIU via the MCDU. This ground data is supplied by the CFDIU, otherwise it can be given by a Flight-Ground discrete provided by the ACARS. The menu mode enables communications between the CFDIU and the ACARS BITE through the MCDU.
R A. Not Applicable
R **ON A/C 051-099,
R A. BITE Implementation
R R R R R (1) Activation of the ACARS MU face test You can activate the ACARS MU face test by pushing the TEST pushbutton on the ACARS MU face. Depending on the outcome of the ACARS MU face test, one of the following indicators ,located on the ACARS MU face, is displayed:
R 1EFF : 001-049, 051-099, 101-105, 1 23-24-00Page 22 1 1 May 01/05 1 1 1CES 1
ACARS System - Last Leg Report R Figure 009
R 1EFF : 001-049, 101-105, 1 23-24-00Page 23 1 1 May 01/05 1 1 1CES 1
ACARS System - Previous Legs Report R Figure 010
R 1EFF : 001-049, 101-105, 1 23-24-00Page 24 1 1 May 01/05 1 1 1CES 1
ACARS System - LRU Identification R Figure 011
R 1EFF : 001-049, 101-105, 1 23-24-00Page 25 1 1 May 01/05 1 1 1CES 1
ACARS System - Trouble Shooting Data R Figure 012
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ACARS System - Class 3 Faults R Figure 013
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R ACARS System - Test Figure 014
R 1EFF : 1 1 1CES 001-049, 101-105, 1 111 23-24-00 Page 28 May 01/05
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